Bladderwrack Whole Thallus 580 mg Ingredients & Drug Interactions
by Nature's Way
What is this page for?
First and foremost: checking Bladderwrack Whole Thallus 580 mg 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
Bladderwrack Whole Thallus 580 mg is a dietary supplement by Nature's Way with 2 active ingredients. Its ingredients are commonly taken for preventing iodine deficiency, supporting thyroid hormone production, general energy and metabolism support.Based on those ingredients, 891 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Bladderwrack, Iodine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Bladderwrack Whole Thallus 580 mg by Nature's Way
Ask about any prescription or over-the-counter medication and we check it for interactions with Bladderwrack Whole Thallus 580 mg by Nature's Way — 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 Bladderwrack Whole Thallus 580 mg by Nature's Way
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
Full disclosure
This product has 2 active ingredients: iodine and bladderwrack whole thallus. Iodine is an essential mineral your body needs for thyroid and metabolism — it's the working component here.
Bladderwrack is a seaweed; we have no data on interactions with it. The capsule also contains hypromellose, an inactive filler.
Does it work?
Strong evidence
Iodine in this product is likely effective for preventing iodine deficiency and protecting the thyroid during radiation exposure. It may also help with mouth sores (oral mucositis) and gum disease (periodontitis), though the evidence for those two is not as firm — those uses are possibly effective.
We have no effectiveness data on file for bladderwrack.
How safe is it?
Well-documented data
Iodine is well tolerated in normal dietary amounts, but high doses can cause thyroid trouble — either an overactive thyroid (hyperthyroidism) or an underactive one (hypothyroidism). The most common side effects are nausea, diarrhea, headache, metallic taste, and goiter (an enlarged thyroid).
Rare but serious reactions, such as severe allergic responses, can happen. In pregnancy, adequate iodine is important, but use only what your doctor advises and avoid high-dose products.
Some iodine passes into breast milk, so follow medical guidance while breastfeeding. If you have a true iodine hypersensitivity (not just a shellfish allergy), you may experience rash, swelling, or fever — talk to your pharmacist before starting.
Meds to double-check
Moderate interaction found
Check your medications if you take lithium, antithyroid drugs (like propylthiouracil), or amiodarone before starting this supplement. All three are affected by high iodine intake, and combining them with this product requires thyroid monitoring.
The bottom line
Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.
Bladderwrack Whole Thallus is used for iodine intake and thyroid support. If you take lithium, antithyroid drugs, or amiodarone, you must check with your pharmacist before adding this — iodine can interfere with how these medications work.
Anyone with thyroid disease or an iodine sensitivity should get personalized advice before starting.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 2 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 22, 2025.
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 Bladderwrack Whole Thallus 580 mg, straight from the product label.
| Brand | Nature's Way |
|---|---|
| Barcode (UPC) | 033674153802 |
| Net contents | 100 Vegan Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Aug 22, 2025 |
| DSLD ID | 337206 |
| Product type | Botanical With Nutrients |
| Supplement form | Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Vegan, Vegetarian, Adult (18 - 50 Years), Gluten Free, Dairy Free |
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 Bladderwrack Whole Thallus 580 mg by Nature's Way, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Iodine | 151 mcg | 101% |
| Bladderwrack | 580 mg | -- |
Other ingredients: Hypromellose
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.
Formulation
Supports thyroid function Botanicals are sourced where they grow best Made with the quality you trust
Vegan Gelatin Free
Vegan Gelatin Free
Supports thyroid function Plant powered
Non GMO Project Verified nongmoproject.org
Gluten free. No salt, wheat, corn, soy, dairy, gelatin, or artificial colors, flavors, or preservaties.
Formula
High potency plant-based iodine per serving Whole Thallus Bladderwrack With 580 mg bladderwrack per serving
Whole Thallus Bladderwrack Plant-based iodine 580 mg per serving
General Statements
Explore more products at naturesway.com Bottle made from 50% post-consumer recycled plastic
Brand IP Statement(s)
Copyright 2025 Nature's Way Brands, LLC
Seals/Symbols
Vegan Gelatin Free
Non GMO Project Verified nongmoproject.org
FDA Disclaimer Statement
These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
FDA Statement of Identity
Dietary Supplement
Suggested/Recommended/Usage/Directions
Recommendation: Adults take 1 capsule daily.
Precautions
If you are pregnant, nursing, or taking any medications, consult a healthcare professional before use.
Keep out of reach of children.
Safety sealed with inner seal. Do not use if seal is broken or missing.
Storage
Keep tightly closed. Store at room temperature. Avoid excessive heat and direct sunlight.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Bladderwrack Whole Thallus 580 mg by Nature's Way 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 Bladderwrack Whole Thallus 580 mg by Nature's Way
These are the 2 active ingredients this product is made of. Select any to open its full monograph.
Serving size1 Capsule(s) Dosage formCapsule Servings per container100 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.
Iodine
Interacts with7 drugs
Iodine is an essential mineral your body needs to make thyroid hormones, and most people get enough from iodized salt, dairy, and seafood. Supplements...
Iodine monograph & interactionsBladderwrack
Interacts with891 drugs
Fucus vesiculosus (bladderwrack) is a brown seaweed rich in iodine that has been used traditionally for thyroid concerns, weight, and skin. There is l...
Bladderwrack monograph & interactionsOther (inactive) ingredients: Hypromellose. These complete the product’s ingredient list but are not active constituents.
Bladderwrack Whole Thallus 580 mg by Nature's Way Drug Interactions
HelloPharmacist Interaction Report
Bladderwrack Whole Thallus 580 mg by Nature's Way contains iodine, which does interact with several medications.
The most serious concern is with lithium, a mood stabilizer — iodine can add to lithium's effect on thyroid function, lowering it further. Both drugs can cause an underactive thyroid (hypothyroidism), and combining them raises that risk.
Your thyroid function should be monitored if you take both.
Read the full breakdown — every affected drug type, severity by severity
Iodine also interacts with antithyroid drugs (used to treat an overactive thyroid) and with amiodarone, a heart rhythm medication. Antithyroid drugs work by limiting thyroid activity, and adding iodine might throw off their balance — iodine can push your thyroid either direction depending on your history.
Amiodarone itself is packed with iodine, so taking this supplement alongside it could pile iodine too high and damage your thyroid. Again, monitoring is key.
We could not check bladderwrack itself — we hold no interaction data for it. Altogether, these interactions span 7 individual medications.
Run your exact prescription list through the interaction checker below before you start.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Bladderwrack Whole Thallus 580 mg?
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 Bladderwrack Whole Thallus 580 mg interact with 891 drugs. Click any drug to see the details.
2 of the 2 ingredients in Bladderwrack Whole Thallus 580 mg interact with drugs. Each result below shows which ingredient is responsible. Bladderwrack Iodine
AmiodaroneCordarone, Pacerone
How Amiodarone interacts with Bladderwrack Whole Thallus 580 mg — through 2 ingredients. Tap an ingredient for the detail:
BladderwrackCytochrome P450 2c8 (cyp2c8) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates +1 Moderate
Interaction Summary
Theoretically, concomitant use of Fucus vesiculosus with CYP2C8 substrates might increase the risk for adverse effects.
Read the full Bladderwrack + Amiodarone interactionIodineAmiodarone (cordarone) Moderate
Interaction Summary
Combining iodine with amiodarone might cause excessively high iodine levels.
Read the full Iodine + Amiodarone interactionCarbimazoleNeo-Mercazole
How Carbimazole interacts with Bladderwrack Whole Thallus 580 mg — through 2 ingredients. Tap an ingredient for the detail:
IodineAntithyroid Drugs Moderate
Interaction Summary
Iodine might alter the effects of antithyroid drugs.
Read the full Iodine + Carbimazole interactionBladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Carbimazole interactionConjugated EstrogensCenestin, Enjuvia, Premarin, Premarin Vaginal Cream
How Conjugated Estrogens interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionDesiccated Thyroid ExtractWesthroid, WP Thyroid
How Desiccated Thyroid Extract interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionDesiccated Thyroid Extract (prescription Drug)Nature-Throid, Thyrar
How Desiccated Thyroid Extract (prescription Drug) interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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) interactionDextrothyroxineCholoxin
How Dextrothyroxine interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionHuman Chorionic Gonadotropin (hcg)Pregnyl
How Human Chorionic Gonadotropin (hcg) interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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) interactionLevothyroxineEltroxin, Estre, Euthyrox, Levo-T, Levolet, Levothroid +5 more
How Levothyroxine interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionLevothyroxine SodiumErmez, Thyquidity, Tirosint-Sol
How Levothyroxine Sodium interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionLevothyroxine, LiothyronineArmour Thyroid
How Levothyroxine, Liothyronine interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionLiothyronineCytomel
How Liothyronine interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionLiotrixEuthroid 1, Euthroid 1/2, Euthroid 3
How Liotrix interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionLiotrix, T4/t3Euthroid 2
How Liotrix, T4/t3 interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionLithium Carbonate (prescription Drug)Eskalith, Lithium Carbonate
How Lithium Carbonate (prescription Drug) interacts with Bladderwrack Whole Thallus 580 mg — through 2 ingredients. Tap an ingredient for the detail:
IodineLithium Moderate
Interaction Summary
Combining iodine with lithium might have additive hypothyroid effects.
Read the full Iodine + Lithium Carbonate (prescription Drug) interactionBladderwrackLithium Moderate
Interaction Summary
Concomitant use of Fucus vesiculosus and lithium has resulted in hyperthyroidism.
Read the full Bladderwrack + Lithium Carbonate (prescription Drug) interactionMenotropinsMenopur, Repronex
How Menotropins interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionMethenamine MandelateMandelamine, Methimazole
How Methenamine Mandelate interacts with Bladderwrack Whole Thallus 580 mg — through 2 ingredients. Tap an ingredient for the detail:
IodineAntithyroid Drugs Moderate
Interaction Summary
Iodine might alter the effects of antithyroid drugs.
Read the full Iodine + Methenamine Mandelate interactionBladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Methenamine Mandelate interactionMethimazoleTapazole
How Methimazole interacts with Bladderwrack Whole Thallus 580 mg — through 2 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 interactionIodineAntithyroid Drugs Moderate
Interaction Summary
Iodine might alter the effects of antithyroid drugs.
Read the full Iodine + Methimazole interactionOspemifeneOsphena
How Ospemifene interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionPotassium Iodide (prescription Drug)Thyro-Block
How Potassium Iodide (prescription Drug) interacts with Bladderwrack Whole Thallus 580 mg — through 2 ingredients. Tap an ingredient for the detail:
IodineAntithyroid Drugs Moderate
Interaction Summary
Iodine might alter the effects of antithyroid drugs.
Read the full Iodine + Potassium Iodide (prescription Drug) interactionBladderwrackAntithyroid 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) interactionPropylthiouracil, PtuPropylthiouracil
How Propylthiouracil, Ptu interacts with Bladderwrack Whole Thallus 580 mg — through 2 ingredients. Tap an ingredient for the detail:
IodineAntithyroid Drugs Moderate
Interaction Summary
Iodine might alter the effects of antithyroid drugs.
Read the full Iodine + Propylthiouracil, Ptu interactionBladderwrackAntithyroid Drugs Moderate
Interaction Summary
Due to its iodine content, Fucus vesiculosus might alter the effects of antithyroid drugs.
Read the full Bladderwrack + Propylthiouracil, Ptu interactionTestosterone UndecanoateAndriol, Aveed, Jatenzo, Kyzatrex
How Testosterone Undecanoate interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionThyroglobulinProloid
How Thyroglobulin interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionThyroid HormoneEtwon
How Thyroid Hormone interacts with Bladderwrack Whole Thallus 580 mg — through 1 ingredient. 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 interactionAdo-trastuzumab EmtansineKadcyla
How Ado-trastuzumab Emtansine interacts with Bladderwrack Whole Thallus 580 mg — 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 Bladderwrack Whole Thallus 580 mg — 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 Bladderwrack Whole Thallus 580 mg — 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 Bladderwrack Whole Thallus 580 mg — 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 Bladderwrack Whole Thallus 580 mg — 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 Bladderwrack Whole Thallus 580 mg — 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 interactionAcalabrutinibCalquence
How Acalabrutinib interacts with Bladderwrack Whole Thallus 580 mg — 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 + Acalabrutinib interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Bladderwrack Whole Thallus 580 mg 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.
Bladderwrack
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.
Iodine
Amiodarone (Cordarone)
Combining iodine with amiodarone might cause excessively high iodine levels.
Amiodarone contains 37.3% iodine and can increase iodine levels. Concomitant use with iodine might increase the risk of having excessive iodine levels and adversely affecting thyroid function. Monitor thyroid function.
Antithyroid Drugs
Iodine might alter the effects of antithyroid drugs.
Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking iodine while using antithyroid drugs could alter the effects of the antithyroid drugs.
Lithium
Combining iodine with lithium might have additive hypothyroid effects.
Lithium can inhibit thyroid function. Several case reports suggest that concomitant use of lithium and potassium iodide can reduce thyroid function in otherwise healthy adults. Monitor thyroid function.
Brand information
Manufacturer and brand details for Bladderwrack Whole Thallus 580 mg, from the product label.
Nature's Way
See all Nature's Way products- Name
- Nature's Way Brands, LLC
- City
- Green Bay
- State
- WI
- ZipCode
- 54311
- Phone Number
- 1-800-962-8873
- Web Address
- naturesway.com
Bladderwrack Whole Thallus 580 mg by Nature's Way: Common Questions
Does Bladderwrack Whole Thallus 580 mg by Nature's Way interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Will this help my thyroid?
Is it safe to take while pregnant?
What are the side effects?
Does bladderwrack itself interact with medications?
Can I take this with my heart medication?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Bladderwrack Whole Thallus 580 mg is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
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 Bladderwrack Whole Thallus 580 mg’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Iodine
Interacts with 7 drugsIodine is an essential mineral your body needs to make thyroid hormones, and most people get enough from iodized salt, dairy, and seafood. Supplements help when you are truly deficient, but...
Read the full Iodine monograph → Herb & supplement monographFucus 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 →Sources & How We Checked
Bladderwrack Whole Thallus 580 mg'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 41 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.
Iodine 26 references
- McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
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