Thyroid Care Plus Ingredients & Drug Interactions
What is this page for?
First and foremost: checking Thyroid Care Plus 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 Care Plus is a dietary supplement by Terry Naturally with 3 active ingredients. Its ingredients are commonly taken for mental focus and alertness, coping with stress, fatigue and sleep loss.Based on those ingredients, 542 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Selenium, L-Tyrosine, Iodine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Thyroid Care Plus by Terry Naturally
Ask about any prescription or over-the-counter medication and we check it for interactions with Thyroid Care Plus by Terry Naturally — 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 Care Plus by Terry Naturally
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
Thyroid Care Plus contains five active ingredients chosen to support thyroid function. L-tyrosine is an amino acid that serves as a building block for thyroid hormones.
The product also includes two forms of iodine—potassium iodide and molecular iodine—which are essential mineral components your thyroid needs to make hormones. Selenium supports thyroid peroxide enzyme activity, and sodium iodide supplies additional iodine.
The remaining ingredients are inactive: microcrystalline cellulose, hydroxypropyl methylcellulose, magnesium stearate, and silica act as fillers and binders to hold the capsule together.
Does it work?
Strong evidence
L-tyrosine is effective for phenylketonuria (PKU) and possibly effective for cognitive function and memory, though possibly ineffective for athletic performance. Evidence is insufficient to rate it for alcohol use disorder and dementia.
Molecular iodine is likely effective for radiation exposure and iodine deficiency, and possibly effective for oral mucositis and periodontitis. Selenium is likely effective for selenium deficiency and possibly effective for Kashin-Beck disease, pre-eclampsia, and autoimmune thyroiditis, though possibly ineffective for high cholesterol (dyslipidemia).
We hold no effectiveness data for potassium iodide or sodium iodide in the facts provided.
How safe is it?
Well-documented data
L-tyrosine is generally well tolerated in healthy adults, but talk with a healthcare provider before regular use; the safety data are limited. Most common side effects in trials were fatigue, headache, heartburn, and nausea.
Potassium iodide is likely safe in pregnancy. Sodium iodide is likely safe in pregnancy but possibly unsafe—avoid high-dose supplements unless your doctor advises otherwise.
Iodine (molecular iodine) is likely safe in pregnancy but possibly unsafe; adequate iodine matters for the baby, but excess can pass into breast milk, so follow your doctor's guidance. Selenium is safe in small recommended amounts, but excess can be toxic; do not exceed 400 mcg daily without medical advice.
In rare cases, very high doses have caused hair loss, nail changes, nausea, vomiting, and in extreme cases, multi-organ failure.
Meds to double-check
Moderate interaction found
Before taking this product, double-check with your pharmacist or doctor if you're on blood thinners or antiplatelet drugs (Moderate), blood pressure or heart rhythm medications including lithium (Moderate), thyroid drugs or antithyroid treatments (Moderate), levodopa for Parkinson's disease (Moderate), potassium-sparing diuretics, ACE inhibitors, or ARBs (Moderate), immunosuppressants or barbiturates (Moderate), or birth control pills (Minor). No interactions are documented for iodine when we cannot check its component, but potassium iodide, sodium iodide, and molecular iodine all carry documented interactions listed above.
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.
Thyroid Care Plus may be worth considering if you have an iodine or selenium deficiency and want to support thyroid function, but it interacts with a large number of medications—especially blood thinners, heart drugs, and thyroid treatments. If you take any regular medications, check with your pharmacist or doctor before starting.
Avoid high-dose iodine supplements if you're on lithium or antithyroid drugs.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 5 of 5 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Feb 23, 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 Thyroid Care Plus, straight from the product label.
| Brand | Terry Naturally |
|---|---|
| Barcode (UPC) | 367703134167 |
| Net contents | 60 Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Feb 23, 2025 |
| DSLD ID | 325767 |
| Product type | Other Combinations |
| Supplement form | Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Kosher, Women (not pregnant or lactating), Gluten Free, Dairy Free, Sugar 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 Thyroid Care Plus by Terry Naturally, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| L-Tyrosine | 400 mg | -- |
| Potassium Iodide | 14644 mcg | -- |
| Iodine | 30000 mcg | 20000% |
| Selenium | 300 mcg | 545% |
| Sodium Iodide | 14644 mcg | -- |
| Molecular Iodine | 712 mcg | -- |
Other ingredients: Microcrystalline Cellulose, Hydroxypropyl Methylcellulose, Magnesium Stearate, Silica
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
Recommendations: 1-2 capsules daily in the morning on an empty stomach. For long-term use, consult a healthcare practitioner.
Precautions
Do not use if trying to conceive, pregnant, or nursing.
Formula
Features nutrients for optimal thyroid support. Iodine in three forms for thyroid hormone synthesis which supports healthy metabolism, lustrous hair, and healthy hormone balance. Supports healthy levels already within normal range L-tyrosine helps create thyroxine and supports mental well-being and daily energy. Selenium supports the conversion of T4 into the active thyroid hormone, T3.
Star-K (Kosher)
Thyroid Care Plus with Selenium Iodine, L-tyrosine, & Selenium
Formulation
Money-back guarantee
Non-GMO
Complete Metabolic Function
No sugar, salt, wheat, gluten, corn, soy, dairy products, artificial coloring, artificial flavoring, or artificial preservatives.
Seals/Symbols
Star-K (Kosher)
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
Dietary Supplement
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Thyroid Care Plus by Terry Naturally 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 Care Plus by Terry Naturally
These are the 3 active ingredients this product is made of. Select any to open its full monograph.
Serving size1 Capsule(s) Dosage formCapsule Servings per container30 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.
L-Tyrosine
Interacts with21 drugs
L-tyrosine is an amino acid your body uses to make brain chemicals like dopamine and norepinephrine. Some studies suggest it may help mental performan...
L-Tyrosine monograph & interactionsIodine
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 & interactionsSelenium
Interacts with321 drugs
Selenium is an essential trace mineral your body needs in small amounts for thyroid function, antioxidant defense, and immune health. Most people who...
Selenium monograph & interactionsOther (inactive) ingredients: Microcrystalline Cellulose, Hydroxypropyl Methylcellulose, Magnesium Stearate, Silica. These complete the product’s ingredient list but are not active constituents.
Thyroid Care Plus by Terry Naturally Drug Interactions
HelloPharmacist Interaction Report
Thyroid Care Plus by Terry Naturally contains five active ingredients, and together they interact with a substantial number of medications.
The most serious interaction we've documented is with blood thinners (anticoagulants and antiplatelet drugs): selenium, one of the product's ingredients, may increase bleeding risk if you're on warfarin or similar medications—this is a Moderate severity concern.
Read the full breakdown — every affected drug type, severity by severity
L-tyrosine in this product can theoretically reduce how well levodopa (used for Parkinson's disease) works by competing for absorption; it may also add to the effects of thyroid hormone medications you might already be taking. Potassium iodide and sodium iodide raise concerns with blood pressure medications (antihypertensives), heart rhythm drugs (lithium), and diuretics that spare potassium—all Moderate severity.
Iodine can interact with lithium and antithyroid drugs. Sodium iodide has additional Moderate interactions with corticosteroids and certain antivirals like didanosine.
Selenium also theoretically affects immunosuppressants, barbiturates, and niacin supplements (all Moderate), plus a Minor interaction with birth control pills. Altogether, these interactions span 536 individual medications.
If you take any prescription or over-the-counter medication—especially blood thinners, heart or blood pressure drugs, thyroid medications, lithium, or Parkinson's treatments—run it through the checker below before you start this product.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Thyroid Care Plus?
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 Care Plus interact with 542 drugs. Click any drug to see the details.
3 of the 3 ingredients in Thyroid Care Plus interact with drugs. Each result below shows which ingredient is responsible. Selenium L-Tyrosine Iodine
6-mercaptopurinePurinethol
How 6-mercaptopurine interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + 6-mercaptopurine interactionAbciximabReoPro
How Abciximab interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Abciximab interactionAbrocitinibCibinqo
How Abrocitinib interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs, Immunosuppressants Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Abrocitinib interactionAcebutololRhotral, Sectral
How Acebutolol interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
Sodium IodideAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, a high intake of dietary sodium might reduce the effectiveness of antihypertensive drugs.
Read the full Sodium Iodide + Acebutolol interactionAcenocoumarolSintrom
How Acenocoumarol interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acenocoumarol interactionAcetaminophen, AspirinGemnisyn
How Acetaminophen, Aspirin interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetaminophen, Aspirin interactionAcetaminophen, Aspirin, CaffeineExcedrin, Excedrin Extra Strength, Excedrin Migraine
How Acetaminophen, Aspirin, Caffeine interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetaminophen, Aspirin, Caffeine interactionAcetaminophen, ButalbitalAxocet, Bancap, Bucet, Butex Forte, Esgic CF, Orbivan CF +5 more
How Acetaminophen, Butalbital interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumBarbiturates Moderate
Interaction Summary
Theoretically, selenium might prolong the sedating effects of barbiturates.
Read the full Selenium + Acetaminophen, Butalbital interactionAcetaminophen, Butalbital, CaffeineEsgic, Esgic Plus, Fiogesic, Fioricet, Repan, Tecnal +1 more
How Acetaminophen, Butalbital, Caffeine interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumBarbiturates Moderate
Interaction Summary
Theoretically, selenium might prolong the sedating effects of barbiturates.
Read the full Selenium + Acetaminophen, Butalbital, Caffeine interactionAcetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
How Acetaminophen, Butalbital, Caffeine, Codeine interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumBarbiturates Moderate
Interaction Summary
Theoretically, selenium might prolong the sedating effects of barbiturates.
Read the full Selenium + Acetaminophen, Butalbital, Caffeine, Codeine interactionAcetaminophen, IbuprofenCombogesic
How Acetaminophen, Ibuprofen interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetaminophen, Ibuprofen interactionAcetazolamideAk-Zol, Diamox
How Acetazolamide interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
Sodium IodideAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, a high intake of dietary sodium might reduce the effectiveness of antihypertensive drugs.
Read the full Sodium Iodide + Acetazolamide interactionAcetylsalicylic AcidEntrophen
How Acetylsalicylic Acid interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetylsalicylic Acid interactionAdalimumabHumira
How Adalimumab interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab interactionAdalimumab-adazHyrimoz
How Adalimumab-adaz interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-adaz interactionAdalimumab-adbmCyltezo
How Adalimumab-adbm interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-adbm interactionAdalimumab-afzbAbrilada
How Adalimumab-afzb interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-afzb interactionAdalimumab-attoAmjevita
How Adalimumab-atto interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-atto interactionAdalimumab-bwwdHadlima
How Adalimumab-bwwd interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-bwwd interactionAdalimumab-fkjpHulio
How Adalimumab-fkjp interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-fkjp interactionAlefaceptAmevive
How Alefacept interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Alefacept interactionAlemtuzumabCampath
How Alemtuzumab interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Alemtuzumab interactionAliskirenTekturna
How Aliskiren interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
Sodium IodideAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, a high intake of dietary sodium might reduce the effectiveness of antihypertensive drugs.
Read the full Sodium Iodide + Aliskiren interactionAlteplase, TpaActilyse, Activase
How Alteplase, Tpa interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Alteplase, Tpa interactionAluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium HydroxideAscriptin Codeine #2
How Aluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium Hydroxide interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Aluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium Hydroxide interactionAluminum Hydroxide, Aspirin, Magnesium HydroxideAscriptin
How Aluminum Hydroxide, Aspirin, Magnesium Hydroxide interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Aluminum Hydroxide, Aspirin, Magnesium Hydroxide interactionAmbrisentanLetairis, Volibris
How Ambrisentan interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
Sodium IodideAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, a high intake of dietary sodium might reduce the effectiveness of antihypertensive drugs.
Read the full Sodium Iodide + Ambrisentan interactionAmilorideAmilamont, Midamor
How Amiloride interacts with Thyroid Care Plus — through 2 ingredients. Tap an ingredient for the detail:
Potassium IodidePotassium-sparing Diuretics Moderate
Interaction Summary
Concomitant use increases the risk of hyperkalemia.
Read the full Potassium Iodide + Amiloride interactionSodium IodideAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, a high intake of dietary sodium might reduce the effectiveness of antihypertensive drugs.
Read the full Sodium Iodide + Amiloride interactionAmiloride, HydrochlorothiazideAmil-Co, Amilzide, Moduret 25, Moduretic
How Amiloride, Hydrochlorothiazide interacts with Thyroid Care Plus — through 2 ingredients. Tap an ingredient for the detail:
Sodium IodideAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, a high intake of dietary sodium might reduce the effectiveness of antihypertensive drugs.
Read the full Sodium Iodide + Amiloride, Hydrochlorothiazide interactionPotassium IodidePotassium-sparing Diuretics Moderate
Interaction Summary
Concomitant use increases the risk of hyperkalemia.
Read the full Potassium Iodide + Amiloride, Hydrochlorothiazide interactionAminophylline, Amobarbital, EphedrineAmesec
How Aminophylline, Amobarbital, Ephedrine interacts with Thyroid Care Plus — through 1 ingredient. Tap an ingredient for the detail:
SeleniumBarbiturates Moderate
Interaction Summary
Theoretically, selenium might prolong the sedating effects of barbiturates.
Read the full Selenium + Aminophylline, Amobarbital, Ephedrine interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Thyroid Care Plus 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.
Selenium
Anticoagulant/Antiplatelet Drugs
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Clinical research suggests that taking selenium 10 mcg/kg/day can increase bleeding times by increasing prostacyclin production, which inhibits platelet activity. Other clinical research suggests that taking selenium 75 mcg daily, in combination with ascorbic acid 600 mg, alpha-tocopherol 300 mg, and beta-carotene 27 mg, reduces platelet aggregation.
Barbiturates
Theoretically, selenium might prolong the sedating effects of barbiturates.
Laboratory research suggests that selenium can inhibit the hepatic metabolism of barbiturates. Selenium seems to prolong the sedative effect of pentobarbital in animal models.
Immunosuppressants
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
In vitro research and preliminary clinical evidence suggests that selenium may stimulate the immune system.
Warfarin (Coumadin)
Theoretically, selenium might interfere with warfarin activity.
Animal research suggests that selenium can increase warfarin activity. Selenium might interact with warfarin by displacing it from albumin binding sites, reducing its metabolism in the liver, or by decreasing production of vitamin K-dependent clotting factors. Selenium can also prolong bleeding times in humans by increasing prostacyclin production, which inhibits platelet activity.
Contraceptive Drugs
Contraceptive drugs might increase levels of selenium, although the clinical significance of this effect is unclear.
Some research suggests that oral contraceptives increase serum selenium levels in women taking oral contraceptives; however, other research shows no change in selenium levels. It is suggested that an increase could be due to increased carrier proteins, indicating a redistribution of selenium rather than a change in total body selenium.
Niacin
Selenium might reduce the beneficial effects of niacin on high-density lipoprotein (HDL) levels.
A combination of niacin and simvastatin (Zocor) effectively raises HDL cholesterol levels in patients with coronary disease and low HDL levels. Clinical research shows that taking a combination of antioxidants (vitamin C, vitamin E, beta-carotene, and selenium) along with niacin and simvastatin (Zocor) attenuates this rise in HDL, specifically the HDL-2 and apolipoprotein A1 fractions, by more than 50% in patients with coronary disease. It is not known whether this adverse effect is due to a single antioxidant such as selenium, or to the combination. It also is not known whether it will occur in other patient populations.
L-Tyrosine
Levodopa
Theoretically, tyrosine might decrease the effectiveness of levodopa.
Tyrosine and levodopa compete for absorption in the proximal duodenum by the large neutral amino acid (LNAA) transport system. Advise patients to separate doses of tyrosine and levodopa by at least 2 hours.
Thyroid Hormone
Theoretically, tyrosine might have additive effects with thyroid hormone medications.
Tyrosine is a precursor to thyroxine and might increase levels of thyroid hormones.
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 Thyroid Care Plus, from the product label.
Terry Naturally
See all Terry Naturally products- Name
- EuroPharma, Inc.
- City
- Green Bay
- State
- WI
- ZipCode
- 54311
- Phone Number
- (866) 807-2731
- Web Address
- EuroPharmaUSA.com
Thyroid Care Plus by Terry Naturally: Common Questions
Does Thyroid Care Plus by Terry Naturally interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Is this safe to take if I'm pregnant?
Can I take this while breastfeeding?
What is L-tyrosine for?
Why is there both iodine and selenium in this?
What does selenium do?
Are there any side effects I should know about?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Thyroid Care Plus 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 Thyroid Care Plus’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Tyrosine
Interacts with 21 drugsL-tyrosine is an amino acid your body uses to make brain chemicals like dopamine and norepinephrine. Some studies suggest it may help mental performance during short-term stress, sleep loss,...
Read the full Tyrosine monograph → Herb & supplement monographIodine
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 monographPotassium
Interacts with 62 drugsPotassium is an essential mineral your body needs for nerve signals, muscle function, and a steady heartbeat, and most people get enough from a balanced diet rich in fruits and vegetables. P...
Read the full Potassium monograph → Herb & supplement monographSodium
Interacts with 205 drugsSodium is an essential mineral and electrolyte your body needs to balance fluids, support nerves, and help muscles work. Most people in modern diets get more than enough—often too much—from...
Read the full Sodium monograph → Herb & supplement monographSelenium
Interacts with 321 drugsSelenium is an essential trace mineral your body needs in small amounts for thyroid function, antioxidant defense, and immune health. Most people who eat a varied diet get enough, and supple...
Read the full Selenium monograph →Sources & How We Checked
Thyroid Care Plus'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 116 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.
Tyrosine 4 references
- Meyer JS, Welch KM, Deshmukh VD, et al. Neurotransmitter precursor amino acids in the treatment of multi-infarct dementia and Alzheimer's disease. J Amer Geriat Soc 1977;25:289-98.
- DiPiro JT, Talbert RL, Yee GC, et al; eds. Pharmacotherapy: A pathophysiologic approach. 4th ed. Stamford, CT: Appleton & Lange, 1999.
- Wood DR, Reimherr FW, Wender PH. Amino acid precursors for the treatment of attention deficit disorder, residual type. Psychopharmacol Bull 1985;21:146-9.
- van Spronsen FJ, van Rijn M, Bekhof J. Phenylketonuria: tyrosine supplementation in phenylalanine-restricted diets. Am J Clin Nutr 2001;73:153-7. PubMed
Potassium 12 references
- McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
- Gennaro A. Remington: The Science and Practice of Pharmacy. 19th ed. Lippincott: Williams & Wilkins, 1996.
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