Interactions on record — worth a quick check against your medications. Check your meds →
Dietary supplement

Thyroid Care Ingredients & Drug Interactions

by Herbal Terra

Thyroid Care label
See full label image
Liquid Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Thyroid Care 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

The interaction bottom line Most serious interaction: Moderate

Thyroid Care is a dietary supplement by Herbal Terra with 3 active ingredients. Its ingredients are commonly taken for source of dietary iodine, thyroid support, cervical dilation (medical procedure).Based on those ingredients, 242 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are certified organic Horsetail (Equisetum arvense) dried herb extract, certified organic Oatstraw (Avena sativa) dried stem and leaf extract, certified organic Kelp (Laminaria hyperborea) extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Thyroid Care by Herbal Terra

Ask about any prescription or over-the-counter medication and we check it for interactions with Thyroid Care by Herbal Terra — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Thyroid Care by Herbal Terra

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

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Sep 17, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 3 active ingredients.
  • “Proprietary Herbal Extracts Blend” is a proprietary blend — the label gives one combined amount (970 mg) without saying how much of each component you get.

This liquid supplement contains 3 active ingredients. Kelp extract (from Laminaria hyperborea) is a seaweed rich in iodine, traditionally used to support thyroid function.

Oatstraw (Avena sativa) is the dried stem and leaf of the oat plant, used for general wellness. Horsetail (Equisetum arvense) is a plant extract also used in herbal preparations.

The product is made with a proprietary herbal extracts blend and menstruum (the liquid used to extract and preserve the herbs).

Does it work?

Couldn't assess
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
Not assessable

We hold no graded evidence for this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: thyroid support.
  • We looked for evidence on: Hypothyroidism, Thyroid function, Iodine deficiency.
  • Our graded evidence for these ingredients doesn't cover that particular purpose.

The evidence for these ingredients is mixed. Oatstraw shows likely effectiveness for high cholesterol (dyslipidemia) and heart disease risk, based on the data we hold.

For the other uses tracked — kelp for cancer, high blood pressure, weight loss, and radiation sickness, and horsetail for urinary incontinence, weight loss, throat inflammation, or hair loss — the evidence isn't established in our data. Kelp was also rated possibly ineffective for preventing miscarriage and labor.

The evidence, ingredient by ingredient Laminaria Oats Horsetail

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 3 of the 3 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 3 of 3.
  • General safety write-ups exist for 3 of 3.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Oatstraw is generally well tolerated and likely safe in pregnancy and breastfeeding when eaten as food; concentrated supplements are less studied. Horsetail is generally only recommended short-term by healthy adults — long-term use and unverified products carry real risks.

Pregnancy and breastfeeding safety data for horsetail is insufficient, so it's best avoided in both. Kelp is the biggest safety concern: it's generally safe as a food, but supplements can deliver very high and variable amounts of iodine that may harm the thyroid.

Pregnancy safety data rates kelp as possibly unsafe to unsafe — excess iodine can damage the fetal thyroid. Avoid concentrated kelp supplements while breastfeeding, since iodine passes into breast milk and may affect your infant's thyroid.

Kelp can also concentrate arsenic from seawater; in rare cases, long-term use has caused arsenic poisoning symptoms including headache, weakness, fatigue, memory problems, rash, nail damage, diarrhea, and vomiting. Most common side effects from oatstraw are bloating, gas, and abdominal distension; from horsetail, nausea and increased bowel movements.

Crude (unprocessed) horsetail contains thiaminase, which can deplete thiamine (vitamin B1) with prolonged use — though Canadian products must be certified thiaminase-free.

Side effects, ingredient by ingredient Laminaria Oats Horsetail

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?
  • 3 of the 3 matched ingredients can interact with medications — Laminaria, Oats, Horsetail.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: diabetes medications; heart-rhythm medications; lithium.
  • For scale: 242 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.

Before taking Herbal Terra's Thyroid Care, double-check with your doctor or pharmacist if you take thyroid hormone or antithyroid drugs (the iodine in kelp may alter how they work), blood pressure medications like ACE inhibitors, potassium-sparing diuretics or other water pills, antidiabetes drugs or insulin, heart medications like digoxin or amiodarone, lithium, or HIV medications such as nucleoside reverse transcriptase inhibitors or efavirenz. No interactions are documented for the proprietary herbal extracts blend itself — we hold no separate monograph for that component.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Thyroid Care may appeal to people looking to support thyroid health with herbal ingredients, but it's not for everyone. If you take any thyroid medication, heart drugs, blood pressure medication, diabetes medication, lithium, or HIV treatment, you need to check with your doctor or pharmacist before starting — the interactions are real and potentially serious.

The same goes if you're pregnant, breastfeeding, or planning to become pregnant. Talk it over with your own healthcare provider to see if this product makes sense for you.

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

Assessment coverage: 3 of 3 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Sep 25, 2020.

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 Herbal Terra
Barcode (UPC) 606595915851
Net contents 4 Fluid Ounce(s); 120 mL
Market status On market
Date entered into DSLD Sep 25, 2020
DSLD ID 234262
Product type Botanical
Supplement form Liquid
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Organic, Gluten 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 Herbal Terra, 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 mL
Maximum serving Sizes:
1 mL
Servings per container
120
UPC/BARCODE
606595915851
IngredientAmount% DV
Proprietary Herbal Extracts Blend970 mg--
certified organic Kelp (Laminaria hyperborea) extract0 NP--
certified organic Oatstraw (Avena sativa) dried stem and leaf extract0 NP--
certified organic Horsetail (Equisetum arvense) dried herb extract0 NP--

Other ingredients: Menstruum

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.
Formula

Certified organic: Kelp (laminaria hyperborea) dried whole plant. Origin: Canada. Oatstraw (Avena sativa) dried stem and leaf. Origin: USA. Horsetail (Equisetum arvense) dried herb. Origin: Bulgaria.

Formulation

Certified organic: Kelp (laminaria hyperborea) dried whole plant. Origin: Canada. Oatstraw (Avena sativa) dried stem and leaf. Origin: USA. Horsetail (Equisetum arvense) dried herb. Origin: Bulgaria.

Manufactured in the USA in an FDA registered facility

Sugar free

This formula is used to support normal thyroid hormone production.

Dried herb/menstruum ratio: 1:3 Expertly extracted Laboratory tested 330 mg/1 mL Premium product Super concentrated liquid herbal extract

Non GMO

No artificial ingredients, GMO, gluten, color additives, fillers, preservatives or binders. Natural Gluten Free

Suggested/Recommended/Usage/Directions

Direction Shake well before use. Adults take up to 30 drops (1 mL, one full squeeze of the dropper bulb) in 3-4 fl. oz of juice or water up to 4 times a day. We recommend to seek expert medical advice before taking this or any other herbal supplements.

FDA Disclaimer Statement

Notice This product has not been evaluated by the FDA and is not intended to diagnose, treat, cure, or prevent any disease.

Precautions

Caution May have contraindications.

Do not use if you are allergic to any ingredients.

Consult a physician before using during pregnancy, if nursing, or if you are on any medications.

Keep out of the reach of children.

Storage

Store in a cool, dry, dark place.

FDA Statement of Identity

Herbal Supplement

Seals/Symbols

Made in USA FDA registered facility Natural Gluten Free 100% Natural guaranteed

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Thyroid Care by Herbal Terra label

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

Thyroid Care label

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)
What’s inside

The Ingredients in Thyroid Care by Herbal Terra

These are the 3 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 mL Dosage formLiquid Servings per container120 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.

Other (inactive) ingredients: Menstruum. These complete the product’s ingredient list but are not active constituents.

Interaction report

Thyroid Care by Herbal Terra 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
242Drugs
242 Moderate

Ingredients driving the most interactions

certified organic Horsetail (Equisetum arvense) dried herb extract 188
certified organic Oatstraw (Avena sativa) dried stem and leaf extract 86
certified organic Kelp (Laminaria hyperborea) extract 69

Individual Drug Interactions

The ingredients in Thyroid Care interact with 242 drugs. Click any drug to see the details.

3 of the 3 ingredients in Thyroid Care interact with drugs. Each result below shows which ingredient is responsible. certified organic Horsetail (Equisetum arvense) dried herb extract certified organic Oatstraw (Avena sativa) dried stem and leaf extract certified organic Kelp (Laminaria hyperborea) extract

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.

certified organic Horsetail (Equisetum arvense) dried herb extract5 drug types · 188 drugs

Antidiabetes Drugs

Theoretically, taking horsetail with antidiabetes drugs might increase the risk of hypoglycemia.
Equisetum myriochaetum has demonstrated hypoglycemic activity in clinical research. In an animal diabetic model, Equisetum giganteum had hypoglycemic effects. It is unclear whether other horsetail species have hypoglycemic effects.

Likelihood Possible Evidence D
Diuretic Drugs

Theoretically, taking horsetail with diuretic drugs might increase potassium loss and the risk of hypokalemia.
Laboratory research shows that various species of horsetail have diuretic properties. Due to its diuretic effects, there has been concern that taking horsetail along with potassium-depleting diuretics might increase the risk for hypokalemia. However, pharmacokinetic research in humans shows that taking horsetail 900 mg daily for 4 days does not affect urinary excretion of electrolytes, including potassium and sodium, despite having a diuretic effect similar to taking hydrochlorothiazide 25 mg daily. It is unclear if taking horsetail for a longer duration would affect electrolyte levels. Until more is known, use with caution.

Likelihood Possible Evidence D
Efavirenz (Sustiva)

Theoretically, horsetail might decrease the levels and clinical effects of efavirenz.
In two case reports, patients were found to have detectable viral loads when taking horsetail-containing supplements along with an antiretroviral regimen that included efavirenz. In one case, the antiretroviral regimen included zidovudine, lamivudine, and efavirenz; in the other case, the regimen consisted of emtricitabine, tenofovir disoproxil fumarate, and efavirenz. One month after discontinuing horsetail, the viral loads became undetectable in both cases. The exact mechanism of this interaction is unknown. It is also unclear if this interaction is specific to efavirenz or if it is related to various components of antiretroviral therapy.

Likelihood Possible Evidence D
Lithium

Theoretically, horsetail might increase the levels and adverse effects of lithium.
Animal research suggests that horsetail has diuretic properties. Theoretically, due to these potential diuretic effects, horsetail might reduce excretion and increase levels of lithium. The dose of lithium might need to be decreased.

Likelihood Possible Evidence D
Nucleoside Reverse Transcriptase Inhibitors (Nrtis)

Theoretically, horsetail might decrease the levels and clinical effects of NRTIs.
In two case reports, patients were found to have detectable viral loads when taking horsetail-containing supplements along with an antiretroviral therapy. In one case, the antiretroviral regimen included zidovudine, lamivudine, and efavirenz; in the other case, the regimen consisted of emtricitabine, tenofovir disoproxil fumarate, and efavirenz. One month after discontinuing the supplement, the viral loads became undetectable in both cases. The exact mechanism of these interactions is unknown. It is also unclear if these interactions are specific to NRTIs or if they are related to various components of antiretroviral therapy.

Likelihood Possible Evidence D
certified organic Horsetail (Equisetum arvense) dried herb extract full monograph & interactions

certified organic Oatstraw (Avena sativa) dried stem and leaf extract2 drug types · 86 drugs

Antidiabetes Drugs

Theoretically, oats may have additive effects with antidiabetic agents and might increase the risk of hypoglycemia.
Consuming oats can decrease blood glucose in patients with diabetes. In those who require insulin, taking oats 100 grams daily for 2 days reduces the insulin dose required to achieve metabolic control.

Likelihood Possible Evidence D
Insulin

Concomitant use of oats and insulin might increase the risk of hypoglycemia.
In patients with insulin-dependent type 2 diabetes, taking oats 100 grams daily for 2 days reduces the insulin dose required to achieve metabolic control.

Likelihood Possible Evidence B
certified organic Oatstraw (Avena sativa) dried stem and leaf extract full monograph & interactions

certified organic Kelp (Laminaria hyperborea) extract6 drug types · 69 drugs

Ace Inhibitors (Aceis)

Theoretically, laminaria might increase the risk of hyperkalemia when taken with ACEIs.
Laminaria contains potassium.

Likelihood Possible Evidence D
Amiodarone (Cordarone)

Theoretically, combining laminaria with amiodarone might cause excessively high iodine levels.
Amiodarone contains 37.3% iodine and can increase iodine levels. Concomitant use with laminaria supplements, some of which may contain as much as 1000 mcg iodine, might increase the risk of adverse effects from iodine, including altered thyroid function.

Likelihood Possible Evidence D
Antithyroid Drugs

Due to its iodine content, laminaria might alter the effects of antithyroid drugs.
Some laminaria supplements contain up to 1000 mcg of iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking laminaria could theoretically alter the effects of antithyroid drugs.

Likelihood Possible Evidence D
Digoxin (Lanoxin)

Theoretically, laminaria might increase the risk of hyperkalemia, which could increase the effects and adverse effects of digoxin.
Laminaria contains potassium.

Likelihood Possible Evidence D
Potassium-Sparing Diuretics

Theoretically, laminaria might increase the risk of hyperkalemia when taken with potassium-sparing diuretics.
Laminaria contains potassium.

Likelihood Possible Evidence D
Thyroid Hormone

Due to its iodine content, laminaria might alter the effects of thyroid hormone.
Some laminaria supplements contain up to 1000 mcg of iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking laminaria could theoretically alter the effects of thyroid hormone.

Likelihood Possible Evidence D
certified organic Kelp (Laminaria hyperborea) extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Thyroid Care, from the product label.

Herbal Terra

See all Herbal Terra products
Name
Herbal Terra
Pharmacist Counseling Corner

Thyroid Care by Herbal Terra: Common Questions

Does Thyroid Care by Herbal Terra interact with any medications?
Yes. Based on its ingredients, Thyroid Care has a known interaction with 242 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 3 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.
Can I take this if I'm pregnant or breastfeeding?
Kelp in this product is rated possibly unsafe to unsafe in pregnancy because excess iodine can harm your baby's thyroid development. Avoid concentrated kelp supplements while breastfeeding since iodine passes into breast milk. Horsetail safety isn't well studied in pregnancy or breastfeeding, so it's best avoided. Oatstraw as food is generally considered safe in both, but the supplement form is less studied. Talk with your doctor or pharmacist before taking this product if you're pregnant, breastfeeding, or planning pregnancy.
What are the most common side effects?
Oatstraw may cause bloating, gas, abdominal distension, and an unpleasant taste — usually mild and often improve with continued use. Horsetail may cause nausea, increased bowel movements, and abdominal distension. These happen because both add fiber to your diet. The rare serious concern with kelp is arsenic accumulation from seawater, which in long-term use can cause headache, weakness, fatigue, rash, nail damage, and digestive upset.
Does this actually work for thyroid health?
The evidence we hold doesn't establish that kelp or horsetail work for thyroid support. Oatstraw is likely effective for high cholesterol and heart disease — but that's a different benefit. If you have a thyroid condition, talk with your doctor or pharmacist about whether this product makes sense alongside your treatment, since it may interfere with thyroid medications.
Why is iodine in kelp a concern if iodine supports the thyroid?
Some iodine is necessary, but kelp supplements can deliver very high, uncontrolled amounts — up to 1000 micrograms per dose. Too much iodine can actually cause both an overactive and underactive thyroid, depending on your history. If you're already taking thyroid medication or antithyroid drugs, these high doses can throw off how your medicine works.
Is this safe if I take a water pill or heart medication?
Kelp contains potassium and may raise potassium levels further when you take potassium-sparing diuretics (water pills), ACE inhibitors (blood pressure drugs), or digoxin (a heart medication). High potassium can cause serious problems with heart rhythm and muscle function. Check with your doctor or pharmacist before combining this product with any of these medications.
Can I take this with diabetes or HIV medications?
Both oatstraw and horsetail may lower blood sugar and raise the risk of dangerously low blood sugar (hypoglycemia) with diabetes drugs or insulin. Horsetail may also reduce the effectiveness of HIV medications like efavirenz and other antiretrovirals. Talk with your doctor or pharmacist before starting this product if you take any diabetes or HIV treatment — dose adjustments might be needed.

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.

Thyroid Care label
Go deeper

The Full Monographs Behind Thyroid Care’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Laminaria

Interacts with 69 drugs

Laminaria is a type of brown seaweed (kelp) that is very rich in iodine and is also used in medical settings as a natural cervical dilator. Because its iodine content can be high and variabl...

Read the full Laminaria monograph → Herb & supplement monograph

Oats

Interacts with 86 drugs

Oats are a well-studied whole grain whose soluble fiber (beta-glucan) can help lower cholesterol and support heart health when eaten regularly. As a food, oats are safe for most people, and...

Read the full Oats monograph → Herb & supplement monograph

Horsetail

Interacts with 188 drugs

Horsetail is a traditional herb most often used as a mild diuretic and for hair, nail, and bone support, but high-quality human evidence is limited. It can cause thiamine (vitamin B1) loss w...

Read the full Horsetail monograph →
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 36 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.

Laminaria 9 references
  1. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  2. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  3. Pye KG, Kelsey SM, House IM, et al. Severe dyserythropoeisis and autoimmune thrombocytopenia associated with ingestion of kelp supplement. Lancet 1992;339:1540.
  4. Kazzi GM, Bottoms SF, Rosen MG. Efficacy and safety of Laminaria digitata for preinduction ripening of the cervix. Obstet Gynecol 1982;60:440-3..
  5. Harrell BL, Rudolph AH. Letter: Kelp diet: A cause of acneform eruption. Arch Dermatol 1976;112:560.
  6. Eliason BC. Transient hyperthyroidism in a patient taking dietary supplements containing kelp. J Am Board Fam Pract 1998;11:478-80. PubMed
  7. Norman JA, Pickford CJ, Sanders TW, Waller M. Human intake of arsenic and iodine from seaweed-based food supplements and health foods available in the UK. Food Addit Contam 1988;5:103-9.. PubMed
  8. Amster E, Tiwary A, Schenker MB. Case report: potential arsenic toxicosis secondary to herbal kelp supplement. Environ Health Perspect 2007;115:606-8. PubMed
  9. Miyai K, Tokushige T, Kondo M; Iodine Research Group. Suppression of thyroid function during ingestion of seaweed "Kombu" (Laminaria japonoca) in normal Japanese adults. Endocr J. 2008 Dec;55(6):1103-8. Epub 2008 Aug 9.

See these in context on the Laminaria monograph →

Oats 13 references
  1. Cooper SG, Tracey EJ. Small-bowel obstruction caused by oat-bran bezoar. N Engl J Med 1989;320:1148-9. DOI
  2. Pick ME, Hawrysh ZJ, Gee MI, et al. Oat bran concentrate bread products improve long-term control of diabetes: a pilot study. J Am Diet Assoc 1996;96:1254-61. PubMed
  3. Braaten JT, Scott FW, Wood PJ, et al. High beta-glucan oat bran and oat gum reduce postprandial blood glucose and insulin in subjects with and without type 2 diabetes. Diabet Med 1994;11:312-8.
  4. Rosario PG, Gerst PH, Prakash K, Albu E. Dentureless distention: oat bran bezoars cause obstruction. J Am Geriatr Soc 1990;38:608. PubMed
  5. Food and Drug Administration. Food labeling: health claims: oats and coronary heart disease. Fed Regist 1996;61:296-313.
  6. Foulke J. FDA Allows Whole Oat Foods To Make Health Claim on Reducing the Risk of Heart Disease. FDA Talk Paper. 1997. Available at: http://www.fda.gov/bbs/topics/ANSWERS/ANS00782.html.
  7. Chandalia M, Garg A, Lutjohann D, et al. Beneficial effects of high dietary fiber intake in patients with type 2 diabetes mellitus. N Engl J Med 2000;342:1392-8. PubMed
  8. Lembo A, Camilleri M. Chronic constipation. N Engl J Med 2003;349:1360-8. . PubMed
  9. De Paz Arranz S, Perez Montero A, Remon LZ, Molero MI. Allergic contact urticaria to oatmeal. Allergy 2002;57:1215. . PubMed
  10. Delgado G, Kleber ME, Krämer BK, et al. Dietary intervention with oatmeal in patients with uncontrolled type 2 diabetes mellitus - A crossover study. Exp Clin Endocrinol Diabetes. 2019;127(9):623-629. PubMed
  11. Sobhan M, Hojati M, Vafaie SY, Ahmadimoghaddam D, Mohammadi Y, Mehrpooya M. The efficacy of colloidal oatmeal cream 1% as add-on therapy in the management of chronic irritant hand eczema: A double-blind study. Clin Cosmet Investig Dermatol. 2020;13:241-25
  12. Hou Q, Li Y, Li L, Cheng G, Sun X, Li S, Tian H. The metabolic effects of oats intake in patients with type 2 diabetes: A systematic review and meta-analysis. Nutrients. 2015;7(12):10369-87. PubMed
  13. González-Afonso M, Cañas JA, Sastre B, et al. A Case of Anaphylaxis After Ingestion of Oats: Research Into New Allergens. J Investig Allergol Clin Immunol 2022;32(6):506-508. PubMed

See these in context on the Oats monograph →

Horsetail 14 references
  1. Sudan BJ. Seborrhoeic dermatitis induced by nicotine of horsetails (Equisetum arvense L.). Contact Dermatitis 1985;13:201-2.
  2. Perez Gutierrez RM, Laguna GY, Walkowski A. Diuretic activity of Mexican equisetum. J Ethnopharmacol 1985;14:269-72. PubMed
  3. Lemus I, Garcia R, Erazo S, et al. Diuretic activity of an Equisetum bogotense tea (Platero herb): evaluation in healthy volunteers. J Ethnopharmacol 1996;54:55-8. PubMed
  4. Revilla MC, Andrade-Cetto A, Islas S, Wiedenfeld H. Hypoglycemic effect of Equisetum myriochaetum aerial parts on type 2 diabetic patients. J Ethnopharmacol 2002;81:117-20. PubMed
  5. Tiktinskii, O. L. and Bablumian, I. A. [Therapeutic action of Java tea and field horsetail in uric acid diathesis]. Urol.Nefrol.(Mosk) 1983;3(1):47-50.
  6. Henderson JA, Evans EV, and McIntosh RA. The antithiamine action of Equisetum. J Amer Vet Med Assoc 1952;120:375-378.
  7. Carneiro DM, Freire RC, Honório TC, Zoghaib I, Cardoso FF, Tresvenzol LM, de Paula JR, Sousa AL, Jardim PC, da Cunha LC. Randomized, Double-Blind Clinical Trial to Assess the Acute Diuretic Effect of Equisetum arvense (Field Horsetail) in Healthy Voluntee
  8. Klnçalp S, Ekiz F, Basar Ö, Coban S, Yüksel O. Equisetum arvense (Field Horsetail)-induced liver injury. Eur J Gastroenterol Hepatol. 2012 Feb;24(2):213-4. PubMed
  9. Ortega García JA, Angulo MG, Sobrino-Najul EJ, Soldin OP, Mira AP, Martínez-Salcedo E, Claudio L. Prenatal exposure of a girl with autism spectrum disorder to 'horsetail' (Equisetum arvense) herbal remedy and alcohol: a case report. J Med Case Rep. 2011 M PubMed
  10. Cordova E, Morganti L, Rodriguez C. Possible Drug-Herb Interaction between Herbal Supplement Containing Horsetail (Equisetum arvense) and Antiretroviral Drugs. J Int Assoc Provid AIDS Care. 2017;16(1):11-13.
  11. García Gavilán MD, Moreno García AM, Rosales Zabal JM, Navarro Jarabo JM, Sánchez Cantos A. Case of drug-induced acute pancreatitis produced by horsetail infusions. Rev Esp Enferm Dig. 2017 Apr;109(4):301-304. PubMed
  12. Vieira GT, de Oliveira TT, Carneiro MAA, et al. Antidiabetic effect of Equisetum giganteum L. extract on alloxan-diabetic rabbit. J Ethnopharmacol. 2020;260:112898. PubMed
  13. Health Canada. Organism-Equisetum arvense. Available at: http://webprod.hc-sc.gc.ca/nhpid-bdipsn/ingredReq.do?id=6117&lang=eng. Accessed 21-July 2021.
  14. Bates D, Duong TB, Kheyson S, Moore K. Hyponatremia Secondary to Decreased Oral Intake and SIADH and Possibly Exacerbated by Horsetail (Equisetum arvense). Can J Hosp Pharm 2021;74(4):386-389. PubMed

See these in context on the Horsetail 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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