Thyroid Health Ingredients & Drug Interactions
by New Sun
What is this page for?
First and foremost: checking Thyroid Health against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
Thyroid Health is a dietary supplement by New Sun with 6 active ingredients. Its ingredients are commonly taken for thyroid support, iodine source, weight management.Based on those ingredients, 930 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Kelp, Dulse, Irish Moss. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Thyroid Health by New Sun
Ask about any prescription or over-the-counter medication and we check it for interactions with Thyroid Health by New Sun — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Thyroid Health by New Sun
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Low disclosure
Thyroid Health contains 6 ingredients, including a proprietary blend. The main active ingredients are kelp, black walnut, sarsaparilla, dulse, bladderwrack, and Irish moss — all plant-based sources traditionally used to support thyroid function.
The product comes in a vegetarian capsule. Kelp, dulse, and bladderwrack are seaweeds rich in iodine, a mineral essential for thyroid hormone production.
Sarsaparilla and black walnut are plant roots and nuts with a history in herbal medicine, though evidence for their thyroid-specific effects is limited. The inactive ingredient is the capsule shell itself.
Does it work?
Not established
The evidence supporting these ingredients for thyroid health is not established in the data we hold. Black walnut, sarsaparilla, and dulse all show insufficient reliable evidence for the conditions tested — coronary heart disease, psoriasis, rheumatoid arthritis, iodine deficiency, and high cholesterol.
We have no effectiveness ratings on file for kelp, bladderwrack, or Irish moss. If you're considering this for a specific thyroid concern, talk with your doctor or pharmacist about what the current research actually shows.
How safe is it?
Well-documented data
Black walnut is generally well tolerated when the nut itself is used, but the leaf, bark, and hull contain high levels of tannins and can cause stomach upset, skin irritation, or temporary staining. The product's safety data note cautions that long-term use of black walnut is not well studied.
Black walnut is not recommended in pregnancy or while breastfeeding due to insufficient safety information. Sarsaparilla is likely low-risk in food amounts, but human safety data at supplement doses are limited.
It is best avoided during pregnancy and breastfeeding. Dulse, because it's concentrated in iodine and potassium, should be used cautiously; food amounts are generally fine, but high-dose supplements carry unpredictable iodine levels.
No adverse effects have been documented for dulse itself in our data. We hold no safety data on file for kelp, bladderwrack, or Irish moss.
Meds to double-check
Moderate interaction found
If you take thyroid hormone (levothyroxine, Synthroid), antithyroid drugs, or amiodarone (Cordarone), check this product with your pharmacist first — dulse's iodine content may affect how they work. You should also double-check if you take digoxin, lithium, potassium-sparing water pills, ACE inhibitors, or ARBs, as sarsaparilla and dulse have documented Moderate or Minor interactions with these drug types.
The bottom line
Scorecard at a glanceFormula with limited ingredient disclosure with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.
This product is for people interested in plant-based thyroid support, but the evidence for how well it works isn't established. If you take thyroid medications, heart drugs like digoxin, lithium, or blood-pressure medications, you need to check with your pharmacist before starting — dulse and sarsaparilla can interact with these.
Because this is a multi-ingredient product with limited long-term safety data, talk to your pharmacist about whether it fits your health plan.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 6 of 6 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Jun 24, 2019.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about Thyroid Health, straight from the product label.
| Brand | New Sun |
|---|---|
| Barcode (UPC) | 46-6 |
| Net contents | 100 Vegetarian Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Jun 24, 2019 |
| DSLD ID | 204130 |
| Product type | Other Combinations |
| Supplement form | Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years) |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for Thyroid Health by New Sun, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Proprietary Blend | 1100 mg | -- |
| Kelp | 0 NP | -- |
| Black Walnut | 0 NP | -- |
| Sarsaparilla | 0 NP | -- |
| Dulse | 0 NP | -- |
| Bladderwrack | 0 NP | -- |
| Irish Moss | 0 NP | -- |
Other ingredients: Vegetarian Capsule
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Suggested/Recommended/Usage/Directions
Recommendation: As a dietary supplement, take two capsules with meals three times daily.
Precautions
Do not use if safety seal is missing or broken.
Keep out of reach of children.
Allergen Information: Contains black walnut (hulls).
Warning: Do not take if pregnant or nursing.
Therapeutic use not recommended for hyperthyroidism.
If you are taking any medications or experiencing health issues, consult your doctor before use.
Long-term use is not recommended.
Storage
Store in a cool, dry place.
Formula
New Sun's Thyroid Health is a natural source of iodine and minerals. Iodine is known to support the thyroid and increase the metabolism. This herbal combination was formulated to support and balance the thyroid. Bladderwrack is also known to help with hot flashes and weight loss. Dulse and Sarsaparilla are helpful for the endocrine system. Irish Moss helps absorb toxins from the body, reduce appetite, and is a protector to all glands and lungs. Black Walnut helps to burn excessive toxins and help the body maintain already healthy sugar levels.
Allergen Information: Contains black walnut (hulls).
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
FDA Statement of Identity
Herbal Supplement
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Thyroid Health by New Sun label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in Thyroid Health by New Sun
These are the 6 active ingredients this product is made of. Select any to open its full monograph.
Serving size2 Vegetarian Capsule(s) Dosage formCapsule Servings per container50 Amounts shown are per serving.
Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.
Proprietary Blend
- › Kelp
- › Black Walnut
- › Sarsaparilla
- › Dulse
- › Bladderwrack
- › Irish Moss
Other (inactive) ingredients: Vegetarian Capsule. These complete the product’s ingredient list but are not active constituents.
Thyroid Health by New Sun Drug Interactions
HelloPharmacist Interaction Report
Thyroid Health by New Sun contains ingredients with documented interactions affecting a range of medications.
Dulse, a key ingredient rich in iodine and potassium, poses the most serious concern: it may interfere with thyroid hormone (Synthroid, levothyroxine) and antithyroid drugs (propylthiouracil, methimazole), potentially altering how well they work. Because this product is marketed for thyroid health, taking it alongside thyroid medications requires careful coordination.
Read the full breakdown — every affected drug type, severity by severity
Dulse also interacts with several heart and blood-pressure medications. It may increase potassium levels when combined with digoxin (a heart rhythm drug), potassium-sparing water pills, ACE inhibitors, or angiotensin receptor blockers (ARBs) — all rated as Moderate or Minor interactions.
Additionally, dulse's high iodine content may interact with amiodarone (Cordarone), a heart rhythm medication that itself contains significant iodine.
Sarsaparilla, another active ingredient, has documented Moderate interactions with lithium (a mood stabilizer) and digoxin, both through effects on potassium and fluid balance.
We could not check kelp, bladderwrack, and Irish moss — no interaction data are on file for them. Black walnut has no documented interactions in our data.
Altogether, these interactions span 86 individual medications. Use the medication checker below with your exact prescriptions before starting this product.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Thyroid Health?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Thyroid Health interact with 930 drugs. Click any drug to see the details.
4 of the 6 ingredients in Thyroid Health interact with drugs. Each result below shows which ingredient is responsible. Kelp Dulse Irish Moss Sarsaparilla
AmiodaroneCordarone, Pacerone
How Amiodarone interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackAmiodarone (cordarone), Cytochrome P450 2c8 (cyp2c8) Substrates +1 Moderate
Interaction Summary
Theoretically, combining Fucus vesiculosus with amiodarone might cause excessively high iodine levels.
Read the full Bladderwrack + Amiodarone interactionDulseAmiodarine (cordarone) Moderate
Interaction Summary
Theoretically, combining dulse with amiodarone might cause excessively high iodine levels.
Read the full Dulse + Amiodarone interactionIrish MossAmiodarone (cordarone) Moderate
Interaction Summary
Theoretically, combining sea moss with amiodarone might cause excessively high iodine levels.
Read the full Irish Moss + Amiodarone interactionCarbimazoleNeo-Mercazole
How Carbimazole interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Carbimazole interactionDulseAntithyroid Drugs Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of antithyroid drugs.
Read the full Dulse + Carbimazole interactionIrish MossAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of antithyroid drugs.
Read the full Irish Moss + Carbimazole interactionConjugated EstrogensCenestin, Enjuvia, Premarin, Premarin Vaginal Cream
How Conjugated Estrogens interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackCytochrome P450 3a4 (cyp3a4) Substrates, Thyroid Hormone Moderate
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Conjugated Estrogens interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Conjugated Estrogens interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Conjugated Estrogens interactionDesiccated Thyroid ExtractWesthroid, WP Thyroid
How Desiccated Thyroid Extract interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Desiccated Thyroid Extract interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Desiccated Thyroid Extract interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Desiccated Thyroid Extract interactionDesiccated Thyroid Extract (prescription Drug)Nature-Throid, Thyrar
How Desiccated Thyroid Extract (prescription Drug) interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Desiccated Thyroid Extract (prescription Drug) interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Desiccated Thyroid Extract (prescription Drug) interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Desiccated Thyroid Extract (prescription Drug) interactionDextrothyroxineCholoxin
How Dextrothyroxine interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Dextrothyroxine interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Dextrothyroxine interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Dextrothyroxine interactionDigoxinDigitek, Lanoxicaps, Lanoxin
How Digoxin interacts with Thyroid Health — through 2 ingredients. Tap an ingredient for the detail:
DulseDigoxin (lanoxin) Moderate
Interaction Summary
Theoretically, dulse might increase the risk of hyperkalemia when taken with digoxin.
Read the full Dulse + Digoxin interactionSarsaparillaDigoxin (lanoxin) Moderate
Interaction Summary
Theoretically, concomitant use of sarsaparilla with digoxin might increase the risk of cardiac toxicity.
Read the full Sarsaparilla + Digoxin interactionHuman Chorionic Gonadotropin (hcg)Pregnyl
How Human Chorionic Gonadotropin (hcg) interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Human Chorionic Gonadotropin (hcg) interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Human Chorionic Gonadotropin (hcg) interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Human Chorionic Gonadotropin (hcg) interactionLevothyroxineEltroxin, Estre, Euthyrox, Levo-T, Levolet, Levothroid +5 more
How Levothyroxine interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Levothyroxine interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Levothyroxine interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Levothyroxine interactionLevothyroxine SodiumErmez, Thyquidity, Tirosint-Sol
How Levothyroxine Sodium interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Levothyroxine Sodium interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Levothyroxine Sodium interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Levothyroxine Sodium interactionLevothyroxine, LiothyronineArmour Thyroid
How Levothyroxine, Liothyronine interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Levothyroxine, Liothyronine interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Levothyroxine, Liothyronine interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Levothyroxine, Liothyronine interactionLiothyronineCytomel
How Liothyronine interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Liothyronine interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Liothyronine interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Liothyronine interactionLiotrixEuthroid 1, Euthroid 1/2, Euthroid 3
How Liotrix interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Liotrix interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Liotrix interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Liotrix interactionLiotrix, T4/t3Euthroid 2
How Liotrix, T4/t3 interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Liotrix, T4/t3 interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Liotrix, T4/t3 interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Liotrix, T4/t3 interactionLithium Carbonate (prescription Drug)Eskalith, Lithium Carbonate
How Lithium Carbonate (prescription Drug) interacts with Thyroid Health — through 2 ingredients. Tap an ingredient for the detail:
BladderwrackLithium Moderate
Interaction Summary
Concomitant use of Fucus vesiculosus and lithium has resulted in hyperthyroidism.
Read the full Bladderwrack + Lithium Carbonate (prescription Drug) interactionSarsaparillaLithium Moderate
Interaction Summary
Theoretically, sarsaparilla might increase the effects and adverse effects of lithium.
Read the full Sarsaparilla + Lithium Carbonate (prescription Drug) interactionMenotropinsMenopur, Repronex
How Menotropins interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Menotropins interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Menotropins interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Menotropins interactionMethenamine MandelateMandelamine, Methimazole
How Methenamine Mandelate interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Methenamine Mandelate interactionDulseAntithyroid Drugs Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of antithyroid drugs.
Read the full Dulse + Methenamine Mandelate interactionIrish MossAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of antithyroid drugs.
Read the full Irish Moss + Methenamine Mandelate interactionMethimazoleTapazole
How Methimazole interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Methimazole interactionDulseAntithyroid Drugs Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of antithyroid drugs.
Read the full Dulse + Methimazole interactionIrish MossAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of antithyroid drugs.
Read the full Irish Moss + Methimazole interactionOspemifeneOsphena
How Ospemifene interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackCytochrome P450 3a4 (cyp3a4) Substrates, Thyroid Hormone Moderate
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Ospemifene interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Ospemifene interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Ospemifene interactionPotassium Iodide (prescription Drug)Thyro-Block
How Potassium Iodide (prescription Drug) interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Potassium Iodide (prescription Drug) interactionDulseAntithyroid Drugs Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of antithyroid drugs.
Read the full Dulse + Potassium Iodide (prescription Drug) interactionIrish MossAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of antithyroid drugs.
Read the full Irish Moss + Potassium Iodide (prescription Drug) interactionPropylthiouracil, PtuPropylthiouracil
How Propylthiouracil, Ptu interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Propylthiouracil, Ptu interactionDulseAntithyroid Drugs Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of antithyroid drugs.
Read the full Dulse + Propylthiouracil, Ptu interactionIrish MossAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of antithyroid drugs.
Read the full Irish Moss + Propylthiouracil, Ptu interactionTestosterone UndecanoateAndriol, Aveed, Jatenzo, Kyzatrex
How Testosterone Undecanoate interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackCytochrome P450 3a4 (cyp3a4) Substrates, Thyroid Hormone Moderate
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Testosterone Undecanoate interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Testosterone Undecanoate interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Testosterone Undecanoate interactionThyroglobulinProloid
How Thyroglobulin interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Thyroglobulin interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Thyroglobulin interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Thyroglobulin interactionThyroid HormoneEtwon
How Thyroid Hormone interacts with Thyroid Health — through 3 ingredients. Tap an ingredient for the detail:
BladderwrackThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Read the full Bladderwrack + Thyroid Hormone interactionDulseThyroid Hormone Moderate
Interaction Summary
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Read the full Dulse + Thyroid Hormone interactionIrish MossThyroid Hormone Moderate
Interaction Summary
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Read the full Irish Moss + Thyroid Hormone interactionAdo-trastuzumab EmtansineKadcyla
How Ado-trastuzumab Emtansine interacts with Thyroid Health — through 1 ingredient. Tap an ingredient for the detail:
BladderwrackCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Ado-trastuzumab Emtansine interactionAbciximabReoPro
How Abciximab interacts with Thyroid Health — through 1 ingredient. Tap an ingredient for the detail:
BladderwrackAnticoagulant/antiplatelet Drugs Minor
Interaction Summary
Theoretically, taking Fucus vesiculosus with antiplatelet or anticoagulant drugs might increase the risk of bruising and bleeding.
Read the full Bladderwrack + Abciximab interactionAbemaciclibVerzenio
How Abemaciclib interacts with Thyroid Health — through 1 ingredient. Tap an ingredient for the detail:
BladderwrackCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Abemaciclib interactionAbiraterone
How Abiraterone interacts with Thyroid Health — through 1 ingredient. Tap an ingredient for the detail:
BladderwrackCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Abiraterone interactionAbiraterone AcetateYonsa, Zytiga
How Abiraterone Acetate interacts with Thyroid Health — through 1 ingredient. Tap an ingredient for the detail:
BladderwrackCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Abiraterone Acetate interactionAbrocitinibCibinqo
How Abrocitinib interacts with Thyroid Health — through 1 ingredient. Tap an ingredient for the detail:
BladderwrackAnticoagulant/antiplatelet Drugs, Cytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
Theoretically, taking Fucus vesiculosus with antiplatelet or anticoagulant drugs might increase the risk of bruising and bleeding.
Read the full Bladderwrack + Abrocitinib interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Thyroid Health with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.
Kelp
Amiodarone (Cordarone)
Theoretically, combining Fucus vesiculosus with amiodarone might cause excessively high iodine levels.
Fucus vesiculosus contains high concentrations of iodine. Amiodarone contains 37.3% iodine and can increase iodine levels. Concomitant use might increase the risk of having excessive iodine levels and adversely affecting thyroid function. Monitor thyroid function.
Antithyroid Drugs
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Fucus vesiculosus contains high concentrations of iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking Fucus vesiculosus while using antithyroid drugs could alter the effects of the antithyroid drugs.
Lithium
Concomitant use of Fucus vesiculosus and lithium has resulted in hyperthyroidism.
There is a case of hyperthyroidism occurring in a patient taking Fucus vesiculosus and lithium. Monitor thyroid hormones closely in patients taking lithium and Fucus vesiculosus concomitantly.
Thyroid Hormone
Due to its iodine content, Fucus vesiculosus might alter the effects of thyroid hormone.
Fucus vesiculosus contains high concentrations of iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking Fucus vesiculosus while using thyroid hormone could alter the effects of thyroid hormone.
Anticoagulant/Antiplatelet Drugs
Theoretically, taking Fucus vesiculosus with antiplatelet or anticoagulant drugs might increase the risk of bruising and bleeding.
In vitro evidence suggests that a constituent of Fucus vesiculosus, known as fucoidan, has anticoagulant effects. However, in clinical research, fucoidan does not seem to have significant anticoagulant activity when taken orally, possibly due to poor absorption.
Cytochrome P450 2C8 (Cyp2C8) Substrates
Theoretically, concomitant use of Fucus vesiculosus with CYP2C8 substrates might increase the risk for adverse effects.
In vitro research shows that fucoidan, a constituent of Fucus vesiculosus, inhibits CYP2C8. This interaction has not been reported in humans.
Cytochrome P450 2C9 (Cyp2C9) Substrates
Theoretically, concomitant use of Fucus vesiculosus with CYP2C9 substrates might increase the risk for adverse effects.
In vitro research shows that fucoidan, a constituent of Fucus vesiculosus, inhibits CYP2C9. This interaction has not been reported in humans.
Cytochrome P450 2D6 (Cyp2D6) Substrates
Theoretically, concomitant use of Fucus vesiculosus with CYP2D6 substrates might alter the effects of these substrates.
In vitro research shows that fucoidan, a constituent of Fucus vesiculosus, both inhibits and induces CYP2D6. This interaction has not been reported in humans.
Cytochrome P450 3A4 (Cyp3A4) Substrates
Theoretically, concomitant use of Fucus vesiculosus with CYP3A4 substrates might increase the risk for adverse effects.
In vitro research shows that fucoidan, a constituent of Fucus vesiculosus, inhibits CYP3A4. This interaction has not been reported in humans.
Dulse
Amiodarine (Cordarone)
Theoretically, combining dulse with amiodarone might cause excessively high iodine levels.
Dulse is rich in iodine, and amiodarone contains 37.3% iodine and can increase iodine levels.
Antithyroid Drugs
Theoretically, due to its iodine content, dulse might alter the effects of antithyroid drugs.
Dulse is rich in iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history.
Digoxin (Lanoxin)
Theoretically, dulse might increase the risk of hyperkalemia when taken with digoxin.
Dulse is rich in potassium, and digoxin can increase potassium levels in the blood. This interaction has not been demonstrated in humans.
Thyroid Hormone
Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Dulse is rich in iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Although dulse has been associated with a statistically significant increase in thyroid stimulating hormone (TSH) levels in clinical research, clinically significant increases have not been documented.
Ace Inhibitors (Aceis)
Theoretically, dulse might increase the risk of hyperkalemia when taken with ACEIs.
Dulse is rich in potassium. ACEIs block the actions of the renin-angiotensin-aldosterone system and reduce potassium excretion. Concomitant use of these drugs with moderate dietary potassium intake (about 3775-5200 mg daily) does not increase serum potassium levels. However, using these drugs while consuming dulse in quantities that provide larger amounts of potassium daily might increase the risk of hyperkalemia. Additionally, in vitro research suggests that dulse protein hydrolysates inhibit the activity of ACE. However, these effects have not been demonstrated in humans.
Angiotensin Receptor Blockers (Arbs)
Theoretically, dulse might increase the risk of hyperkalemia when taken with ARBs.
Dulse is rich in potassium. ARBs block the actions of the renin-angiotensin-aldosterone system and reduce potassium excretion. Concomitant use of these drugs with moderate dietary potassium intake (about 3775-5200 mg daily) does not increase serum potassium levels. However, using these drugs while consuming dulse in quantities that provide higher amounts of potassium daily might increase the risk of hyperkalemia. Additionally, in vitro research suggests that dulse protein hydrolysates inhibit the activity of angiotensin converting enzyme (ACE). However, these effects have not been demonstrated in humans.
Potassium-Sparing Diuretics
Theoretically, dulse might increase the risk of hyperkalemia when taken with potassium-sparing diuretics.
Dulse is rich in potassium, and potassium-sparing diuretics can increase potassium levels in the blood. This interaction has not been shown in humans.
Irish Moss
Amiodarone (Cordarone)
Theoretically, combining sea moss with amiodarone might cause excessively high iodine levels.
Amiodarone contains 37.3% iodine and can increase iodine levels. Concomitant use with sea moss, which contains approximately 4-7 mcg of iodine per gram, might increase the risk of adverse effects from iodine, including altered thyroid function.
Antithyroid Drugs
Due to its iodine content, sea moss might alter the effects of antithyroid drugs.
Sea moss contains approximately 4-7 mcg of iodine per gram. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking sea moss could theoretically alter the effects of antithyroid drugs.
Thyroid Hormone
Due to its iodine content, sea moss might alter the effects of thyroid hormone.
Sea moss contains approximately 4-7 mcg of iodine per gram. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking sea moss could theoretically alter the effects of thyroid hormone.
Sarsaparilla
Digoxin (Lanoxin)
Theoretically, concomitant use of sarsaparilla with digoxin might increase the risk of cardiac toxicity.
Sarsaparilla is thought to have diuretic properties, which could potentially cause potassium loss. Overuse or misuse of sarsaparilla with cardiac glycoside therapy might increase the risk of cardiac toxicity due to potassium loss.
Lithium
Theoretically, sarsaparilla might increase the effects and adverse effects of lithium.
Sarsaparilla is thought to have diuretic properties. Due to these effects, sarsaparilla might reduce excretion and increase levels of lithium. The dose of lithium might need to be decreased.
Brand information
Manufacturer and brand details for Thyroid Health, from the product label.
New Sun
See all New Sun products- Name
- New Sun, Inc.
- City
- Hendersonville
- State
- NC
- ZipCode
- 28792
- Phone Number
- (800) 544-0777
- Web Address
- mynewsun.com
Thyroid Health by New Sun: Common Questions
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Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.
The Full Monographs Behind Thyroid Health’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Fucus Vesiculosus
Interacts with 891 drugsFucus vesiculosus (bladderwrack) is a brown seaweed rich in iodine that has been used traditionally for thyroid concerns, weight, and skin. There is little solid human evidence to support mo...
Read the full Fucus Vesiculosus monograph → Herb & supplement monographBlack Walnut
Black walnut is a tree whose green hulls are traditionally used as a natural antiparasitic and digestive remedy, but solid human evidence for these uses is lacking. It contains a compound ca...
Read the full Black Walnut monograph → Herb & supplement monographSarsaparilla
Interacts with 2 drugsSarsaparilla is a traditional root used in teas, tonics, and old-fashioned root beer flavoring. Modern evidence for its health claims is very limited and comes mostly from lab studies, so it...
Read the full Sarsaparilla monograph → Herb & supplement monographDulse
Interacts with 85 drugsDulse is a red seaweed eaten as a food in many coastal cultures and is a natural source of iodine, potassium, protein, and antioxidant compounds. As a food it is generally considered safe fo...
Read the full Dulse monograph → Herb & supplement monographSea Moss
Interacts with 22 drugsSea moss is a type of red seaweed that is naturally rich in iodine and several minerals, and it is popular as a 'whole-food' supplement. Strong human evidence for most of its health claims i...
Read the full Sea Moss monograph →Sources & How We Checked
Thyroid Health's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 29 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
Fucus Vesiculosus 15 references
- Goodman GA, Rall TW, Nies AS, Taylor P. The Pharmacological Basis of Therapeutics, 9th ed.
- Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
- Phaneuf D, Cote I, Dumas P, et al. Evaluation of the contamination of marine algae (Seaweed) from the St. Lawrence River and likely to be consumed by humans. Environ Res 1999;80:S175-S182. PubMed
- Durig J, Bruhn T, Zurborn KH, et al. Anticoagulant fucoidan fractions from Fucus vesiculosus induce platelet activation in vitro. Thromb Res 1997;85:479-91. PubMed
- Conz PA, La Greca G, Benedetti P, et al. Fucus vesiculosus: a nephrotoxic alga? Nephrol Dial Transplant 1998;13:526-7.
- Ohye H, Fukata S, Kanoh M, et al. Thyrotoxicosis caused by weight-reducing herbal medicines. Arch Intern Med 2005;165:831-4. PubMed
- Okamura K, Inoue K, Omae T. A case of Hashimoto's thyroiditis with thyroid immunological abnormality manifested after habitual ingestion of seaweed. Acta Endocrinol (Copenh) 1978;88:703-12. PubMed
- Agarwal SC, Crook JR, Pepper CB. Herbal remedies -- how safe are they? A case report of polymorphic ventricular tachycardia/ventricular fibrillation induced by herbal medication used for obesity. Int J Cardiol 2006;106:260-1. PubMed
- Sterling JB, Heymann WR. Potassium iodide in dermatology: a 19th century drug for the 21st century-uses, pharmacology, adverse effects, and contraindications. J Am Acad Dermatol 2000;43:691-7. PubMed
- Catania, M. A., Oteri, A., Caiello, P., Russo, A., Salvo, F., Giustini, E. S., Caputi, A. P., and Polimeni, G. Hemorrhagic cystitis induced by an herbal mixture. South.Med.J. 2010;103(1):90-92. PubMed
- Cumashi, A., Ushakova, N. A., Preobrazhenskaya, M. E., D'Incecco, A., Piccoli, A., Totani, L., Tinari, N., Morozevich, G. E., Berman, A. E., Bilan, M. I., Usov, A. I., Ustyuzhanina, N. E., Grachev, A. A., Sanderson, C. J., Kelly, M., Rabinovich, G. A., I
- Irhimeh, M. R., Fitton, J. H., and Lowenthal, R. M. Pilot clinical study to evaluate the anticoagulant activity of fucoidan. Blood Coagul.Fibrinolysis 2009;20(7):607-610. PubMed
- Arbaizar, B. and Llorca, J. [Fucus vesiculosus induced hyperthyroidism in a patient undergoing concomitant treatment with lithium]. Actas Esp.Psiquiatr. 2011;39(6):401-403.
- Church FC, Meade JB, Treanor RE, and et al. Antithrombin activity of fucoidan. The interaction of fucoidan with heparin cofactor II, antithrombin III, and thrombin. J Biol Chem 2-25-1989;264(6):3618-3623. DOI
- Mathew L, Burney M, Gaikwad A, et al. Preclinical evaluation of safety of fucoidan extracts from Undaria pinnatifida and Fucus vesiculosus for use in cancer treatment. Integr Cancer Ther 2017;16(4):572-84.
Black Walnut 3 references
- Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
- McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
- Food and Drug Administration. Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA); Public Law 108-282, Title II. Accessed on May 19, 2021. Available at: https://www.fda.gov/food/food-allergensgluten-free-guidance-documents-regulatory-infor
Sarsaparilla 3 references
- Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
- Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
- Vandenplas O, Depelchin S, Toussaint G, et al. Occupational asthma caused by sarsaparilla root dust. J Allergy Clin Immunol 1996;97:1416-8. PubMed
Dulse 5 references
- Malta D, Arcand J, Ravindran A, Floras V, Allard JP, Newton GE. Adequate intake of potassium does not cause hyperkalemia in hypertensive individuals taking medications that antagonize the renin angiotensin aldosterone system. Am J Clin Nutr 2016 Oct;104(4 PubMed
- Allsopp P, Crowe W, Bahar B, et al. The effect of consuming Palmaria palmata-enriched bread on inflammatory markers, antioxidant status, lipid profile and thyroid function in a randomised placebo-controlled intervention trial in healthy adults. Eur J Nutr PubMed
- McGrath BM, Harmon JP, Bishop G. Palmaria palmata (Dulse) as an unusual maritime aetiology of hyperkalemia in a patient with chronic renal failure: a case report. J Med Case Rep. 2010;4:301. PubMed
- Furuta T, Miyabe Y, Yasui H, Kinoshita Y, Kishimura H. Angiotensin I converting enzyme inhibitory peptides derived from phycobiliproteins of dulse Palmaria palmata. Mar Drugs. 2016;14(2):32. PubMed
- Takase T, Nakamura A, Miyoshi H, et al. Effects of Palmaria palmata on lipid metabolism and glycemic control in participants with hypercholesterolemia in a randomized double-blind placebo-controlled trial. Phytother Res. 2020.
Sea Moss 3 references
- Darias-Rosales J, Rubio C, Gutiérrez ÁJ, Paz S, Hardisson A. Risk assessment of iodine intake from the consumption of red seaweeds (Palmaria palmata and Chondrus crispus). Environ Sci Pollut Res Int 2020;27(36):45737-45741. PubMed
- U.S. Department of Agriculture (USDA). Agricultural Research Service. FoodData Central. Seaweed, irishmoss, raw. April 2019. Available at: https://fdc.nal.usda.gov/fdc-app.html#/food-details/168456/nutrients. Accessed Aug. 30, 2022.
- Palmieri B, Vadalà M, Laurino C. Clinical effects of overwintered-stressed Chondrus Crispus and non-overwintered-stressed Chondrus crispus dietary supplementations. Asian J Med Sci. 2018; 9(6): 7-13. DOI
Parts of this content are provided by the Therapeutic Research Center, LLC.
DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
© 2021 Therapeutic Research Center, LLC