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Dietary supplement

FC-Cidal Ingredients & Drug Interactions

by Biotics Research Corporation

FC-Cidal label
See full label image
Capsule 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 FC-Cidal 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

FC-Cidal is a dietary supplement by Biotics Research Corporation with 7 active ingredients. Its ingredients are commonly taken for cough and respiratory congestion, sore throat, digestive upset.Based on those ingredients, 1,043 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Indian Tinospora, Thyme, French Tarragon. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against FC-Cidal by Biotics Research Corporation

Ask about any prescription or over-the-counter medication and we check it for interactions with FC-Cidal by Biotics Research Corporation — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of FC-Cidal by Biotics Research Corporation

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 Jul 30, 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 7 active ingredients.
  • “Proprietary Blend” is a proprietary blend — the label gives one combined amount (500 mg) without saying how much of each component you get.

FC-Cidal contains seven active ingredients in a proprietary blend: thyme, French tarragon, Indian tinospora, horsetail, pau d'arco, stinging nettle extract, and olive. The product is delivered in a gelatin capsule with water as inactive ingredients.

Each of these botanicals has been used in herbal and traditional medicine for various purposes, though the evidence for many of their intended uses remains limited. They work through different mechanisms — some as anti-inflammatory or immune-supporting agents, others for their traditional roles in respiratory or digestive wellness.

Does it work?

Moderate 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

This product doesn't appear to be marketed for a specific use, so we graded its ingredients' overall clinical evidence instead.

Moderate

Some clinical evidence supports its ingredients for:

  • Diabetes via Stinging Nettle Possibly Effective
Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.
  • Since the label doesn't commit to one use, we graded the ingredients' overall clinical evidence instead.
  • On file: Diabetes — rated "Possibly Effective" (Stinging Nettle) (Natural Medicines).

The evidence for FC-Cidal's ingredients is mixed and mostly insufficient. Indian tinospora and stinging nettle are rated possibly effective for diabetes, based on clinical research showing they may lower blood sugar.

For most other claimed uses — thyme for bronchitis or skin health, French tarragon for nausea, horsetail for incontinence or hair loss, pau d'arco for wound healing, and olive for bone or joint health — the data we hold shows insufficient reliable evidence to rate their effectiveness. The product's overall benefit depends on which condition you're considering it for.

The evidence, ingredient by ingredient Thyme Tarragon Tinospora Cordifolia Horsetail Pau D'arco Stinging Nettle Olive

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 7 of the 7 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 7 of 7.
  • General safety write-ups exist for 7 of 7.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Most of these ingredients are generally well tolerated when used as directed. Thyme is safe in food and medicinal amounts seem safe orally, though the concentrated essential oil can be toxic if swallowed.

French tarragon is fine in food amounts but medicinal doses should be used cautiously and avoided in pregnancy and while breastfeeding due to limited safety data. Indian tinospora has caused rare but serious liver injury in reported cases, so it should be used carefully and under guidance; it's best avoided in pregnancy and breastfeeding.

Horsetail may be used short-term by healthy adults but carries risks with long-term use and unverified products; crude horsetail contains thiaminase, which can cause thiamine deficiency, though products are often certified free of this. Pau d'arco's lapachol can cause anemia and bleeding risk at doses above 1.5 grams daily, and it's best avoided in pregnancy.

Stinging nettle is generally well tolerated but should be avoided in pregnancy; a rare case of liver injury has been reported. Olive as food or oil is very safe, though concentrated supplements are less studied.

Common side effects across these ingredients include headache, nausea, diarrhea, and contact reactions with the raw plant material.

Side effects, ingredient by ingredient Thyme Tarragon Tinospora Cordifolia Horsetail Pau D'arco Stinging Nettle Olive

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?
  • 6 of the 7 matched ingredients can interact with medications — Pau D'arco, Tarragon, Stinging Nettle, Thyme, Horsetail, among others.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs; diabetes medications; lithium.
  • For scale: 1,043 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 FC-Cidal, check with your doctor or pharmacist if you take blood thinners (anticoagulants or antiplatelets like warfarin, aspirin, or heparin), medications for diabetes, CNS depressants (including benzodiazepines and some antidepressants), monoamine oxidase inhibitors (MAOIs), estrogen replacement therapy, anticholinergic or cholinergic medications, water pills (diuretics), lithium, HIV medications (NRTIs or efavirenz), or immunosuppressant drugs. These are the medication types with documented moderate interactions across FC-Cidal's ingredients.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with some supporting evidence behind its ingredients' uses. Moderate medication interactions have been identified, and safety information is well characterized.

FC-Cidal is a multi-ingredient herbal product that may appeal to those looking for traditional botanical support, though most of its intended uses lack strong clinical evidence. If you take any medication — especially blood thinners, diabetes drugs, water pills, lithium, or antidepressants — you should check your exact medications against the interaction tool on this page before starting.

Talk with your doctor or pharmacist to weigh whether this product is right for you and to watch for any changes in how your medications work.

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

Assessment coverage: 7 of 7 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated May 24, 2013.

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 FC-Cidal, straight from the product label.

Brand Biotics Research Corporation
Net contents 100 Capsule(s)
Market status On market
Date entered into DSLD May 24, 2013
DSLD ID 21813
Product type Botanical
Supplement form Capsule
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years)
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 FC-Cidal by Biotics Research Corporation, 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)
IngredientAmount% DV
Proprietary Blend500 mg--
Thyme0 NP--
French Tarragon0 NP--
Indian Tinospora0 NP--
Horsetail0 NP--
Pau d' Arco0 NP--
Stinging Nettle extract0 NP--
Olive0 NP--

Other ingredients: Gelatin, Water

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.
Suggested/Recommended/Usage/Directions

Recommendation: One (1) to two (2) capsules taken twice each day immediately before breakfast and lunch as a dietary supplement or as otherwise directed by a healthcare professional.

Precautions

Caution: Not recommended for pregnant or lactating women.

KEEP OUT OF REACH OF CHILDREN

Sealed with an imprinted safety seal for your protection.

Storage

Store in a cool, dry area.

General Statements

Rev. 2/10

FDA Statement of Identity

Special Dietary Supplement

Brand IP Statement(s)

(C) Copyright 2007

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

See for yourself

FC-Cidal by Biotics Research Corporation label

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

FC-Cidal 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 FC-Cidal by Biotics Research Corporation

These are the 7 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 Capsule(s) Dosage formCapsule Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Proprietary Blend

500 mg per serving

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

Interaction report

FC-Cidal by Biotics Research Corporation Drug Interactions

Want to check YOUR meds against FC-Cidal?

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
1,043Drugs
1,043 Moderate

Ingredients driving the most interactions

Indian Tinospora 612
Thyme 379
French Tarragon 359
Horsetail 188
Stinging Nettle extract 164

Individual Drug Interactions

The ingredients in FC-Cidal interact with 1,043 drugs. Click any drug to see the details.

6 of the 7 ingredients in FC-Cidal interact with drugs. Each result below shows which ingredient is responsible. Indian Tinospora Thyme French Tarragon Horsetail Stinging Nettle extract Pau d' Arco

Each ingredient & the kinds of drugs it affects

For each ingredient in FC-Cidal 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.

Indian Tinospora6 drug types · 612 drugs

Antidiabetes Drugs

Theoretically, Tinospora cordifolia might increase the risk of hypoglycemia when taken with antidiabetes drugs.
Clinical research in adults with type 2 diabetes shows that Tinospora cordifolia can reduce fasting blood glucose and glycated hemoglobin. Additionally, animal research shows that Tinospora cordifolia has hypoglycemic effects.

Likelihood Possible Evidence A
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, Tinospora cordifolia might increase levels of drugs metabolized by CYP1A2.
In vitro research shows that Tinospora cordifolia extract inhibits CYP1A2 at high concentrations. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2C19 (Cyp2C19) Substrates

Theoretically, Tinospora cordifolia might increase levels of drugs metabolized by CYP2C19.
In vitro research shows that Tinospora cordifolia extract inhibits CYP2C19 at high concentrations. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, Tinospora cordifolia might increase levels of drugs metabolized by CYP2C9.
In vitro research shows that Tinospora cordifolia extract inhibits CYP2C9. Animal research shows that Tinospora cordifolia extract 400 mg/kg twice daily for 14 days reduces the clearance and increases plasma levels of glyburide, a CYP2C9 substrate. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2D6 (Cyp2D6) Substrates

Theoretically, Tinospora cordifolia might increase levels of drugs metabolized by CYP2D6.
In vitro research shows that Tinospora cordifolia extract inhibits CYP2D6 at high concentrations. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Immunosuppressants

Theoretically, Tinospora cordifolia might reduce the effectiveness of immunosuppressants.
In vitro and animal research shows that Tinospora cordifolia has immunostimulant effects.

Likelihood Possible Evidence D
Indian Tinospora full monograph & interactions

Thyme4 drug types · 379 drugs

Anticholinergic Drugs

Theoretically, concurrent use of anticholinergic drugs and thyme essential oil might reduce the effects of anticholinergic drugs.
In vitro evidence suggests that thyme essential oil and specific essential oil constituents like thymohydroquinone and carvacrol can inhibit acetylcholinesterase (AChE). However, this effect has not been observed in humans.

Likelihood Possible Evidence D
Anticoagulant/Antiplatelet Drugs

Theoretically, thyme leaf extract might have additive effects with anticoagulant or antiplatelet drugs.
In vitro and animal research suggests that thyme leaf extract has antiplatelet effects. However, this effect has not been observed in humans.

Likelihood Possible Evidence D
Cholinergic Drugs

Theoretically, concurrent use of cholinergic drugs and thyme essential oil might cause additive cholinergic effects.
In vitro evidence suggests that thyme essential oil and specific essential oil constituents like thymohydroquinone and carvacrol can inhibit acetylcholinesterase (AChE). However, this effect has not been observed in humans.

Likelihood Possible Evidence D
Estrogens

Theoretically, thyme might competitively inhibit the effects of estrogen replacement therapy.
In vitro research shows that thyme has estrogen receptor-binding activity and phytoestrogen content. However, this effect has not been observed in humans.

Likelihood Possible Evidence D
Thyme full monograph & interactions

French Tarragon3 drug types · 359 drugs

Anticoagulant/Antiplatelet Drugs

Evidence from in vitro research suggests that tarragon extract inhibits platelet aggregation and adhesion. Theoretically, tarragon might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs. Some anticoagulant or antiplatelet drugs include aspirin, clopidogrel (Plavix), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, ticlopidine (Ticlid), warfarin (Coumadin), and others.

Likelihood Possible Evidence D
Cns Depressants

Evidence from animal research suggests that tarragon essential oil can cause sedation and motor impairment when administered intraperitoneally at a dose of 1 mL/kg. Theoretically, concomitant use of tarragon with CNS depressants, including antihistamines, barbiturates, benzodiazepines, and tricyclic antidepressants, may increase sedative and other adverse effects.

Likelihood Possible Evidence D
Monoamine Oxidase Inhibitors (Maois)

In vitro research suggests that tarragon extract inhibits monoamine oxidase (MAO)-A and MAO-B enzymes. Theoretically, concomitant use with MAOIs might increase the effects and adverse effects associated with MAOIs.

Likelihood Possible Evidence D
French Tarragon full monograph & interactions

Horsetail5 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
Horsetail full monograph & interactions

Stinging Nettle extract4 drug types · 164 drugs

Antidiabetes Drugs

Theoretically, stinging nettle might have additive effects with antidiabetes drugs.
Clinical research shows that stinging nettle might decrease blood glucose levels in patients with diabetes.

Likelihood Possible Evidence B
Diuretic Drugs

Theoretically, combining stinging nettle with diuretic drugs may have additive effects.
Animal research suggests that the above ground parts and roots of stinging nettle may have a diuretic effect.

Likelihood Possible Evidence D
Lithium

Theoretically, stinging nettle might reduce excretion and increase levels of lithium.
Animal research suggests that stinging nettle has diuretic and natriuretic properties, which could alter the excretion of lithium. The dose of lithium might need to be decreased.

Likelihood Possible Evidence D
Warfarin (Coumadin)

There is some concern that stinging nettle might decrease the effects of anticoagulant drugs such as warfarin.
Stinging nettle contains a significant amount of vitamin K. When taken in large quantities, this might interfere with the activity of warfarin.

Likelihood Possible Evidence D
Stinging Nettle extract full monograph & interactions

Pau d' Arco1 drug type · 122 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, pau d'arco might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
In vitro research shows that pau d'arco reduces platelet aggregation and may interfere with vitamin K. One clinical study shows that taking the lapachol constituent of pau d'arco in doses above 1.5 grams daily increases the risk of bleeding. The effects of whole pau d'arco or pau d'arco extract in humans are unclear.

Likelihood Possible Evidence D
Pau d' Arco full monograph & interactions
The maker

Brand information

Manufacturer and brand details for FC-Cidal, from the product label.

Biotics Research Corporation

See all Biotics Research Corporation products
Name
BIOTICS RESEARCH CORP.
City
Rosenberg
State
Texas
Phone Number
(281) 344-0909
Pharmacist Counseling Corner

FC-Cidal by Biotics Research Corporation: Common Questions

Does FC-Cidal by Biotics Research Corporation interact with any medications?
Yes. Based on its ingredients, FC-Cidal has a known interaction with 1,043 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
FC-Cidal contains 7 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.
Is FC-Cidal safe to take during pregnancy or breastfeeding?
No — several ingredients in this product should be avoided in pregnancy or while breastfeeding. French tarragon, Indian tinospora, horsetail, pau d'arco, and stinging nettle all carry safety concerns during pregnancy or lactation due to limited data or theoretical risks. Thyme is rated likely safe in pregnancy in small amounts. Talk with your doctor or pharmacist before taking this product if you're pregnant, planning to become pregnant, or breastfeeding.
What does Indian tinospora do?
Indian tinospora (Tinospora cordifolia) has been used in traditional medicine and has shown some ability to lower blood sugar in clinical research, earning it a rating of possibly effective for diabetes. However, it's been associated with rare cases of serious liver injury, so it should be used cautiously and only under guidance.
Does stinging nettle really help with diabetes?
Clinical research suggests stinging nettle may lower blood glucose levels in people with diabetes, so it's rated possibly effective for that purpose. However, if you take diabetes medication, combining this product with your drug could lower your blood sugar too much, so you'd need to check with your doctor or pharmacist first.
Can I use FC-Cidal if I take warfarin or another blood thinner?
Not without checking with your doctor or pharmacist first. Multiple ingredients in FC-Cidal — thyme, French tarragon, horsetail, pau d'arco, and stinging nettle — may increase bleeding risk or interfere with how blood thinners work. Your healthcare provider needs to review whether it's safe for you.
What are the most common side effects?
The most commonly reported side effects across these ingredients are headache, nausea, diarrhea, and dizziness. Topical contact with the raw plant material (especially stinging nettle) can cause rash, itching, and stinging. If you experience any of these, stop use and talk with your pharmacist.
Is this product safe for long-term use?
The safety data for long-term use is limited. Horsetail is recommended only for short-term use in healthy adults, and crude horsetail can deplete thiamine (vitamin B1) with prolonged consumption. Indian tinospora carries a risk of liver injury with extended use. Talk with your doctor before using FC-Cidal for extended periods.

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.

FC-Cidal label
Go deeper

The Full Monographs Behind FC-Cidal’s Ingredients

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

Herb & supplement monograph

Thyme

Interacts with 379 drugs

Thyme is a common kitchen herb that has long been used for coughs, sore throats, and digestive complaints. It is generally safe in the amounts found in food, and some cough products that com...

Read the full Thyme monograph → Herb & supplement monograph

Tarragon

Interacts with 359 drugs

Tarragon is a flavorful culinary herb that has been used in traditional medicine for digestion, sleep, and other complaints, but solid human evidence for any health benefit is lacking. Amoun...

Read the full Tarragon monograph → Herb & supplement monograph

Tinospora Cordifolia

Interacts with 612 drugs

Tinospora cordifolia, known as Guduchi or Giloy in Ayurvedic medicine, is a climbing plant traditionally used to support immunity and treat fevers. Early laboratory and small human studies s...

Read the full Tinospora Cordifolia 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 → Herb & supplement monograph

Pau D'arco

Interacts with 122 drugs

Pau d'arco is a South American tree bark traditionally used for infections and inflammation, and it contains compounds like lapachol that show activity in lab studies. However, strong human...

Read the full Pau D'arco monograph → Herb & supplement monograph

Stinging Nettle

Interacts with 164 drugs

Stinging nettle is a common plant used as food and in traditional medicine, most often for prostate symptoms, allergies, and joint pain. The evidence is mixed and mostly preliminary, so it i...

Read the full Stinging Nettle monograph → Herb & supplement monograph

Olive

Olive comes from the same tree that gives us olives and olive oil, and its leaf and fruit contain antioxidant compounds like oleuropein and hydroxytyrosol. Olive oil as part of a Mediterrane...

Read the full Olive monograph →
Sources

Sources & How We Checked

FC-Cidal'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 88 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.

Thyme 18 references
  1. Zava DT, Dollbaum CM, Blen M. Estrogen and progestin bioactivity of foods, herbs, and spices. Proc Soc Exp Biol Med 1998;217:369-78. PubMed
  2. Electronic Code of Federal Regulations. Title 21. Part 182 -- Substances Generally Recognized As Safe. Available at: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=182
  3. Okazaki K, Kawazoe K, Takaishi Y. Human platelet aggregation inhibitors from thyme (Thymus vulgaris L.). Phytother Res 2002;16:398-9. .
  4. Spiewak R, Skorska C, Dutkiewicz J. Occupational airborne contact dermatitis caused by thyme dust. Contact Dermatitis 2001;44:235-9. . PubMed
  5. Ernst E, Marz R, Sieder C. A controlled multi-centre study of herbal versus synthetic secretolytic drugs for acute bronchitis. Phytomedicine 1997;4:287-93. PubMed
  6. Yamamoto J, Yamada K, Naemura A, et al. Testing various herbs for antithrombotic effect. Nutrition 2005;21(5):580-7. PubMed
  7. Tognolini, M., Barocelli, E., Ballabeni, V., Bruni, R., Bianchi, A., Chiavarini, M., and Impicciatore, M. Comparative screening of plant essential oils: phenylpropanoid moiety as basic core for antiplatelet activity. Life Sci. 2-23-2006;78(13):1419-1432. PubMed
  8. Mackiewicz, B., Skorska, C., Dutkiewicz, J., Michnar, M., Milanowski, J., Prazmo, Z., Krysinska-Traczyk, E., and Cisak, E. Allergic alveolitis due to herb dust exposure. Ann Agric Environ Med 1999;6(2):167-170.
  9. Martinez-Gonzalez, M. C., Goday Bujan, J. J., Martinez, Gomez W., and Fonseca, Capdevila E. Concomitant allergic contact dermatitis due to Rosmarinus officinalis (rosemary) and Thymus vulgaris (thyme). Contact Dermatitis 2007;56(1):49-50.
  10. Jukic, M., Politeo, O., Maksimovic, M., Milos, M., and Milos, M. In vitro acetylcholinesterase inhibitory properties of thymol, carvacrol and their derivatives thymoquinone and thymohydroquinone. Phytother.Res 2007;21(3):259-261.
  11. Marzian, O. [Treatment of acute bronchitis in children and adolescents. Non-interventional postmarketing surveillance study confirms the benefit and safety of a syrup made of extracts from thyme and ivy leaves]. MMW.Fortschr.Med 6-28-2007;149(27-28 Suppl
  12. Cuzzolin, L. and Benoni, G. Attitudes and knowledge toward natural products safety in the pharmacy setting: an Italian study. Phytother.Res 2009;23(7):1018-1023. PubMed
  13. Berova, N., Stransky, L., and Krasteva, M. Studies on contact dermatitis in stomatological staff. Dermatol.Monatsschr. 1990;176(1):15-18.
  14. Smeenk, G., Kerckhoffs, H. P., and Schreurs, P. H. Contact allergy to a reaction product in Hirudoid cream: an example of compound allergy. Br.J Dermatol. 1987;116(2):223-231.
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Tarragon 9 references
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Tinospora Cordifolia 16 references
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Horsetail 14 references
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Pau D'arco 6 references
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Stinging Nettle 23 references
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Olive 2 references
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