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Dietary supplement

Thyroid Care Ingredients & Drug Interactions

by Terry Naturally

Capsule Category: Other Combinations
Most serious interaction: Moderate
The interaction bottom line Most serious interaction: Moderate

Thyroid Care is a dietary supplement by Terry Naturally with 2 active ingredients. Its ingredients are commonly taken for mental focus and alertness, coping with stress, fatigue and sleep loss.Based on those ingredients, 28 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are L-Tyrosine, Iodine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

HelloPharmacist Scorecard of Thyroid Care 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.

From our pharmacy team — supplement deep dive

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 4 of its 4 active ingredients.
  • “Iodine” is listed as a grouped ingredient — the label gives one combined amount (30,000 mcg) without saying how much of each component you get.

Thyroid Care contains 4 active ingredients. L-tyrosine is an amino acid that your body uses to make thyroid hormones and neurotransmitters.

The product also includes three forms of iodine — potassium iodide, sodium iodide, and molecular iodine — each a source of the mineral iodine, which is essential for thyroid function. The capsule itself is made from inactive ingredients: microcrystalline cellulose, hydroxypropyl methylcellulose, and silica.

Does it work?

Strong evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Strong

Clinical evidence supports at least one of this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: supports thyroid and complete metabolic function.
  • We looked for evidence on: Iodine deficiency, Thyroid cancer, Thyroid storm, Hyperthyroidism, Cognitive function, Fatigue — and 4 related terms.
  • The strongest evidence on file: Iodine is rated "Likely Effective" for Iodine deficiency (Natural Medicines).
  • Also on file: Iodine is rated "Possibly Effective" for Thyroid storm.
  • Also on file: Tyrosine is rated "Possibly Effective" for Cognitive function, Memory.

L-tyrosine is effective for phenylketonuria (PKU), a genetic condition where people can't process phenylalanine properly. It shows possibly effective evidence for cognitive function and memory.

For athletic performance, the evidence leans toward it being possibly ineffective. We don't have enough reliable data to rate it for alcohol use disorder or dementia.

The iodine in this product is likely effective for radiation exposure protection and iodine deficiency, and possibly effective for mouth ulcers (oral mucositis) and gum disease (periodontitis), though adequate medical monitoring is important when iodine is used therapeutically.

The evidence, ingredient by ingredient Tyrosine Iodine

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 2 of the 2 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 2 of 2.
  • General safety write-ups exist for 2 of 2.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

L-tyrosine appears generally well tolerated in healthy adults, though we don't have extensive long-term safety data. Talk to your doctor before starting regular use.

The most common side effects are fatigue, headache, heartburn, and nausea. Higher doses or when combined with other supplements can cause drowsiness, agitation, diarrhea, or vomiting — effects that may ease if the dose is lowered.

Iodine is safe in normal dietary amounts but can cause thyroid problems at high doses. Common side effects include stomach upset, diarrhea, headache, metallic taste, and nausea.

Rarely, people can have hypersensitivity reactions including hives, fever, and swelling. Taking iodine chronically in large amounts may cause acnelike skin lesions (iododerma).

Because iodine is important in pregnancy and breastfeeding but excess passes into breast milk, use only the dose your doctor recommends and avoid high-dose products.

Side effects, ingredient by ingredient Tyrosine Iodine

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 2 of the 2 matched ingredients can interact with medications — Iodine, Tyrosine.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: lithium; Parkinson's medications.
  • For scale: 28 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your pharmacist before taking this product if you're on any of these: levodopa (Parkinson's), thyroid hormone medications, lithium, antithyroid drugs like propylthiouracil or methimazole, or amiodarone (a heart rhythm medication). All of these have moderate interactions documented with ingredients in this supplement.

Check your own medication Run your meds through the checker 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.

This product is for someone looking to support thyroid function with both an amino acid precursor and mineral supplementation. If you take levodopa, any thyroid medication, lithium, antithyroid drugs, or amiodarone, you need to check with your pharmacist first.

Pregnant or breastfeeding? Talk to your doctor about the right dose for you.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 4 of 4 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 31, 2018.

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

At a glance

General information

Key facts about Thyroid Care, straight from the product label.

Brand Terry Naturally
Barcode (UPC) 367703255060
Net contents 60 Capsule(s)
Market status On market
Date entered into DSLD Aug 31, 2018
DSLD ID 176309
Product type Other Combinations
Supplement form Capsule
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Kosher, Gluten Free, Dairy Free, Sugar Free
From the label
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 by Terry Naturally, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Capsule(s)
Maximum serving Sizes:
2 Capsule(s)
Servings per container
30
UPC/BARCODE
367703255060
IngredientAmount% DV
L-Tyrosine400 mg--
Iodine30000 mcg20000%
Potassium Iodide14644 mcg--
Sodium Iodide14644 mcg--
molecular Iodine712 mcg--

Other ingredients: Microcrystalline Cellulose, Hydroxypropyl Methylcellulose, Silica

Tap any ingredient to jump to its full detail below.

Label statements
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.
General Statements

Money-back guarantee

Supports thyroid and complete metabolic function For your good health Terry

Rejuvenate your thyroid! Thyroid health affects many aspects of our lives: daily energy, metabolism, hair and skin, and overall vital sense of well-being.

Your thyroid needs nutrients The thyroid is a butterfly-shaped gland that creates the hormones we need to stay healthy. But age, environmental factors, and family history can affect its performance.

In conjunction with a healthy diet and exercise regimen

BX25506.03

Formula

Thyroid Care provides the nutrients your thyroid needs: Iodine in three forms, including potassium iodide, sodium iodide, and molecular iodine for thyroid hormone synthesis, which in turn supports a healthy metabolism, lustrous hair, and hormone balance. L-Tyrosine, an amino acid required to create the thyroid hormone thyroxine, supports mental well-being and daily energy.

Iodine with L-Tyrosine

Star-K

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

If pregnant or nursing, consult a healthcare practitioner before using.

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.

General

JC 34 91 + 3(5,6)EP L25506.13

FDA Statement of Identity

Dietary Supplement

Formulation

No sugar, salt, yeast, wheat, gluten, corn, soy, dairy products, artificial coloring, artificial flavoring, or artificial preservatives.

Non-GMO

Seals/Symbols

Star-K

Brand IP Statement(s)

Terry Naturally EuroPharma

If you've noticed occasional fatigue, overall sluggishness, or simply don't feel the vibrant health you used to enjoy, Thyroid Care is the answer.

Thyroid Care provides the nutrients your thyroid needs for: - Daily energy - Healthy metabolism - Lustrous hair - Hormone balance - Healthy weight management - Immune health

See for yourself

Thyroid Care by Terry Naturally label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

What’s inside

The Ingredients in Thyroid Care by Terry Naturally

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 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 with
21 drugs
400 mg per serving

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 & interactions

Iodine

Interacts with
7 drugs
30000 mcg per serving

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 & interactions

Other (inactive) ingredients: Microcrystalline Cellulose, Hydroxypropyl Methylcellulose, Silica. These complete the product’s ingredient list but are not active constituents.

Interaction report

Thyroid Care by Terry Naturally Drug Interactions

Want to check YOUR meds against Thyroid Care?

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 checker
28Drugs
28 Moderate

Ingredients driving the most interactions

Iodine 7

Each ingredient & the kinds of drugs it affects

For each ingredient in Thyroid Care 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.

L-Tyrosine2 drug types · 21 drugs

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.

Likelihood Probable Evidence D
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.

Likelihood Probable Evidence D

Iodine3 drug types · 7 drugs

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.

Likelihood Probable Evidence D
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.

Likelihood Probable Evidence D
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.

Likelihood Probable Evidence D
The maker

Brand information

Manufacturer and brand details for Thyroid Care, 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
Pharmacist Counseling Corner

Thyroid Care by Terry Naturally: Common Questions

Does Thyroid Care by Terry Naturally interact with any medications?
Yes. Based on its ingredients, Thyroid Care has a known interaction with 28 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Thyroid Care contains 2 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Does this supplement really help your thyroid?
L-tyrosine is a building block your body uses to make thyroid hormones, and iodine is an essential mineral your thyroid needs to function. The data supports iodine's effectiveness for iodine deficiency and radiation exposure protection. However, we hold evidence that these ingredients are possibly effective for general thyroid support — it's not as strong as the evidence for treating an actual deficiency.
Can I take this if I'm pregnant?
Iodine is actually important in pregnancy, but you need the right amount — too much can be harmful. The data says iodine is likely safe in pregnancy when used at the advised dose, but possibly unsafe at higher doses. Talk with your doctor or midwife about whether you need extra iodine and at what dose. We don't have pregnancy safety data on file for L-tyrosine specifically.
What are the most common side effects?
L-tyrosine users sometimes report fatigue, headache, heartburn, and nausea. Iodine at standard doses is well tolerated, but can cause stomach upset, diarrhea, headache, metallic taste, and nausea. Taking very high doses or for a long time raises the risk of thyroid problems or skin lesions.
Can I take this while breastfeeding?
Some iodine passes into breast milk, so excess can reach your baby. The data rates iodine as likely safe during breastfeeding when you use only the amount your doctor advises, but possibly unsafe at high doses. Follow your doctor's guidance on dosing. We don't have breastfeeding safety data for L-tyrosine on file.
Why does this product have three forms of iodine?
Potassium iodide, sodium iodide, and molecular iodine are all sources of the mineral iodine. Each chemical form delivers iodine to your body, though they may be absorbed slightly differently. The product uses multiple forms, likely to ensure adequate iodine content.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Thyroid Care is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

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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.

Thyroid Care label
Sources

Sources & How We Checked

Thyroid Care'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.

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 30 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
  1. 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.
  2. DiPiro JT, Talbert RL, Yee GC, et al; eds. Pharmacotherapy: A pathophysiologic approach. 4th ed. Stamford, CT: Appleton & Lange, 1999.
  3. Wood DR, Reimherr FW, Wender PH. Amino acid precursors for the treatment of attention deficit disorder, residual type. Psychopharmacol Bull 1985;21:146-9.
  4. van Spronsen FJ, van Rijn M, Bekhof J. Phenylketonuria: tyrosine supplementation in phenylalanine-restricted diets. Am J Clin Nutr 2001;73:153-7. PubMed

See these in context on the Tyrosine monograph →

Iodine 26 references
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Goodman GA, Rall TW, Nies AS, Taylor P. The Pharmacological Basis of Therapeutics, 9th ed.
  3. Ghent WR, Eskin BA, Low DA, Hill LP. Iodine replacement in fibrocystic disease of the breast. Can J Surg 1993;36:453-60.
  4. Potassium iodide for nuclear exposure. Pharmacist's Letter/Prescriber's Letter 2001;17(12):171214.
  5. 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.
  6. Cabezas C, Bustamante B, Holgado W, Begue RE. Treatment of cutaneous sporotrichosis with one daily dose of potassium iodide. Pediatr Infect Dis J 1996;15:352-4. PubMed
  7. 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
  8. Yarrington CD, Pearce EN. Dietary iodine in pregnancy and postpartum. Clin Obstet Gynecol 2011;54:459-70. PubMed
  9. Goel, S., Mandhani, A., Srivastava, A., Kapoor, R., Gogoi, S., Kumar, A., and Bhandari, M. Is povidone iodine an alternative to silver nitrate for renal pelvic instillation sclerotherapy in chyluria? BJU.Int 2004;94(7):1082-1085. PubMed
  10. Teng, W., Shan, Z., Teng, X., Guan, H., Li, Y., Teng, D., Jin, Y., Yu, X., Fan, C., Chong, W., Yang, F., Dai, H., Yu, Y., Li, J., Chen, Y., Zhao, D., Shi, X., Hu, F., Mao, J., Gu, X., Yang, R., Tong, Y., Wang, W., Gao, T., and Li, C. Effect of iodine int
  11. Crawford, B. A., Cowell, C. T., Emder, P. J., Learoyd, D. L., Chua, E. L., Sinn, J., and Jack, M. M. Iodine toxicity from soy milk and seaweed ingestion is associated with serious thyroid dysfunction. Med J Aust. 10-4-2010;193(7):413-415. PubMed
  12. Ohkuma, M. Molluscum contagiosum treated with iodine solution and salicylic acid plaster. Int J Dermatol. 1990;29(6):443-445. PubMed
  13. Connelly KJ, Boston BA, Pearce EN, Sesser D, Snyder D, Braverman LE, Pino S, LaFranchi SH. Congenital hypothyroidism caused by excess prenatal maternal iodine ingestion. J Pediatr. 2012 Oct;161(4):760-2. PubMed
  14. Kasahara T, Narumi S, Okasora K, Takaya R, Tamai H, Hasegawa T. Delayed onset congenital hypothyroidism in a patient with DUOX2 mutations and maternal iodine excess. Am J Med Genet A. 2013 Jan;161A(1):214-7.
  15. Murcia M, Rebagliato M, Iñiguez C, Lopez-Espinosa MJ, Estarlich M, Plaza B, Barona-Vilar C, Espada M, Vioque J, Ballester F. Effect of iodine supplementation during pregnancy on infant neurodevelopment at 1 year of age. Am J Epidemiol. 2011 Apr 1;173(7):8 PubMed
  16. Sang Z, Wang PP, Yao Z, Shen J, Halfyard B, Tan L, Zhao N, Wu Y, Gao S, Tan J, Liu J, Chen Z, Zhang W. Exploration of the safe upper level of iodine intake in euthyroid Chinese adults: a randomized double-blind trial. Am J Clin Nutr. 2012 Feb;95(2):367-73 PubMed
  17. Speeckaert MM, Speeckaert R, Wierckx K, Delanghe JR, Kaufman JM. Value and pitfalls in iodine fortification and supplementation in the 21st century. Br J Nutr. 2011 Oct;106(7):964-73. PubMed
  18. Yun SE, Kang Y, Bae EJ, Hwang K, Jang HN, Cho HS, Chang SH, Park DJ. Iodine-induced thyrotoxic hypokalemic paralysis after ingestion of Salicornia herbace. Ren Fail. 2014 Apr;36(3):461-3.
  19. Iodine Hypersensitivity. Pharmacist's Letter/Prescriber's Letter 2011; 27(5):270504.
  20. Hammel JA, Selby JC. Pustular eruption in a patient with cancer treated with complementary and alternative medicine. JAMA Dermatology 2017 October; E1. doi: 10.1001/jamadermatol.2017.3749. [Epub ahead of print] PubMed
  21. Gil GS, Smith BW, Guerra JR, Williams WT. Acute Delirium in a Hypothyroid Patient Precipitated by Iodine Supplements Use. Am J Ther. 2018;25(6):e717-e718. PubMed
  22. Hamby T, Kunnel N, Dallas JS, Wilson DP. Maternal iodine excess: an uncommon cause of acquired neonatal hypothyroidism. J Pediatr Endocrinol Metab. 2018;31(9):1061-1064. PubMed
  23. Censi S, Watutantrige-Fernando S, Groccia G, et al. The Effects of Iodine Supplementation in Pregnancy on Iodine Status, Thyroglobulin Levels and Thyroid Function Parameters: Results from a Randomized Controlled Clinical Trial in a Mild-to-Moderate Iodine
  24. Rovner MS, Wolf BJ, Rubin M, et al. Instillation of 5% Povidone-Iodine Ophthalmic Drops Decreases the Respiratory Rate in Children Undergoing Strabismus Surgery: A Randomized Controlled Trial. J Pediatr Ophthalmol Strabismus. 2019;56(6):378-382. PubMed
  25. Guenezan J, Garcia M, Strasters D, et al. Povidone Iodine Mouthwash, Gargle, and Nasal Spray to Reduce Nasopharyngeal Viral Load in Patients With COVID-19: A Randomized Clinical Trial. JAMA Otolaryngol Head Neck Surg. 2021;147(4):400-401. PubMed
  26. Li F, Wan S, Zhang L, et al. A Meta-Analysis of the Effect of Iodine Excess on the Intellectual Development of Children in Areas with High Iodine Levels in their Drinking Water. Biol Trace Elem Res 2022;200(4):1580-1590. PubMed

See these in context on the Iodine monograph →

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

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