Red Clover Ingredients & Drug Interactions
by Hawaii Pharm
What is this page for?
First and foremost: checking Red Clover 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
Red Clover is a dietary supplement by Hawaii Pharm with 1 active ingredient. Its ingredients are commonly taken for menopause symptoms (hot flashes), high cholesterol, bone health/osteoporosis.Based on those ingredients, 867 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Red Clover Flower Extract, Dry. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Red Clover by Hawaii Pharm
Ask about any prescription or over-the-counter medication and we check it for interactions with Red Clover by Hawaii Pharm — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Red Clover by Hawaii Pharm
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
This product contains one active ingredient: Red Clover Flower Extract in dried form. Red clover is a plant whose flower contains phytoestrogens—natural compounds that mimic estrogen in your body—which are thought to be its primary active components.
The liquid also includes inactive ingredients: alcohol, water, and glycerin, which serve as the base and preservative for the extract.
Does it work?
Not established
The evidence for red clover's effectiveness is insufficient in our data. It has been studied for menopausal symptoms, osteoporosis, osteoarthritis, and hair loss, but the data we hold doesn't establish reliable benefit for any of these conditions.
If you're thinking about it for a specific health concern, that's worth discussing with your doctor or pharmacist, who can point you toward the latest research.
How safe is it?
Well-documented data
Red clover is generally well tolerated in the short term by healthy adults. The most commonly reported side effects in trials are muscle aches, nausea, and vaginal spotting.
Because of its estrogen-like effects, there's theoretical concern about a possible link to estrogen-sensitive cancers such as breast or uterine cancer, though a meta-analysis of eight clinical trials found only a modest increase in breast density on imaging in premenopausal (but not postmenopausal) women. During pregnancy, the safety data advises against it because of its estrogen-like activity and lack of safety information.
While breastfeeding, there isn't enough safety data; the best approach is to avoid it until you've talked with your doctor or pharmacist about your individual situation.
Meds to double-check
Moderate interaction found
Before taking this red clover product, check with your doctor or pharmacist if you take estrogens or hormone therapy, methotrexate, or tamoxifen—these carry moderate-level concerns. Also mention any blood thinners (anticoagulants or antiplatelet drugs), or medications processed through your liver's CYP1A2, CYP2C19, CYP2C9, or CYP3A4 pathways, though the clinical significance of those minor interactions remains unclear.
The bottom line
Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.
Red Clover by Hawaii Pharm is one to check before you start, especially if you take estrogen therapy, methotrexate, tamoxifen, or any blood thinners. Because it contains phytoestrogens, it's not advised during pregnancy or breastfeeding.
Talk with your doctor or pharmacist before adding it to your routine—they can review your medications and help you decide if it's right for you.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Oct 24, 2023.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about Red Clover, straight from the product label.
| Brand | Hawaii Pharm |
|---|---|
| Barcode (UPC) | 840253643810 |
| Net contents | 4 Fluid Ounce(s); 120 mL |
| Market status | On market |
| Date entered into DSLD | Oct 24, 2023 |
| DSLD ID | 301787 |
| Product type | Botanical |
| Supplement form | Liquid |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Gluten Free |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for Red Clover by Hawaii Pharm, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Red Clover Flower Extract, Dry | 983 mg | -- |
Other ingredients: Alcohol, Water, Glycerin
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Brand IP Statement(s)
Hawaii Pharm Herbal Extract Highest quality since 2008
Suggested/Recommended/Usage/Directions
Suggested use: Shake well before using. For adults add about 20-30 drops (0.7-1 mL, one full squeeze of the dropper bulb) to some juice or water, up to 4 times a day.
Precautions
Warning: We recommend to seek expert medical advice before taking.
Do not use if you are allergic to any ingredients.
Consult your physician before giving to children under 18, during pregnancy, if nursing or taking medications.
Consult your physician before giving to children under 18, during pregnancy, if nursing or taking medications.
May affect the ability to drive and operate machinery. May have contraindications, can cause side effects and adverse reactions. Do not use if seal is broken or missing.
Keep out of the reach of children!
Storage
Store in a cool dry place.
Seals/Symbols
cGMP Made in compliance with cGMP 21 CFR 111 in an FDA registered and inspected facility.
Organic Alcohol Based USA Made in United States of America
FDA Disclaimer Statement
This product has not been evaluated by the FDA and is not intended to diagnose, treat, cure or prevent any disease.
General Statements
Scan this QR-code to get 15% discount on your next purchase. Limited time deal.
Formula
Trifolium pratense
Organic Alcohol Based
Formulation
Only natural ingredients Purity is laboratory tested and verified
All the raw materials are gluten-free by their nature No artificial colors, flavors, or preservatives
Not tested on animals
Organic Alcohol Based
Made in USA, Hawaii
FDA Statement of Identity
Herbal Supplement
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Red Clover by Hawaii Pharm label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in Red Clover by Hawaii Pharm
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size0.7 mL Dosage formLiquid Servings per container120 Amounts shown are per serving.
Red Clover Flower Extract, Dry
Interacts with867 drugs
Red clover is a plant rich in isoflavones (plant compounds with weak estrogen-like activity) that is most often used for menopause symptoms like hot f...
Red Clover Flower Extract, Dry monograph & interactionsOther (inactive) ingredients: Alcohol, Water, Glycerin. These complete the product’s ingredient list but are not active constituents.
Red Clover by Hawaii Pharm Drug Interactions
HelloPharmacist Interaction Report
Red Clover by Hawaii Pharm interacts with several medication types through its phytoestrogens—plant compounds with estrogen-like activity.
The most serious concerns are moderate-severity interactions with estrogens, methotrexate, and tamoxifen. With estrogens, red clover may compete for receptor sites and potentially reduce the effectiveness of hormone therapy.
Methotrexate toxicity is a particular worry; one case report documented severe symptoms including vomiting and abdominal pain after a patient taking methotrexate for psoriasis started red clover. Tamoxifen, used for certain cancers, may also be affected, though animal studies give conflicting signals on whether red clover truly reduces its benefit.
Read the full breakdown — every affected drug type, severity by severity
Minor interactions are documented with several drug-processing pathways in your liver—specifically CYP1A2, CYP2C19, CYP2C9, and CYP3A4 substrates. Red clover may theoretically raise the blood levels of drugs handled by these routes, though small clinical trials using standardized doses found no effect in practice.
Blood thinners and antiplatelet medications (like warfarin or aspirin) have been flagged for minor concern in the lab, but clinical evidence of an actual problem hasn't materialized.
Altogether, these interactions span 868 individual medications. Because the magnitude of effect depends on the dose and standardization of your red clover product, you'll want to run your exact medications through the interaction checker below before starting.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Red Clover?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Red Clover interact with 867 drugs. Click any drug to see the details.
1 of the 1 ingredient in Red Clover interact with drugs. Each result below shows which ingredient is responsible. Red Clover Flower Extract, Dry
Etonogestrel, Ethinyl EstradiolNuvaRing
How Etonogestrel, Ethinyl Estradiol interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates, Estrogens +1 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Etonogestrel, Ethinyl Estradiol interactionLevonorgestrel, Ethinyl EstradiolLogynon ED, Microgynon 30, Nordette, Ovranette, Quartette, Trinordiol +1 more
How Levonorgestrel, Ethinyl Estradiol interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates, Estrogens +1 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Levonorgestrel, Ethinyl Estradiol interactionMedroxyprogesterone Acetate, Oestrogens, ConjugatedPremique
How Medroxyprogesterone Acetate, Oestrogens, Conjugated interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryEstrogens, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover Flower Extract, Dry + Medroxyprogesterone Acetate, Oestrogens, Conjugated interactionMethotrexateOtrexup, Rasuvo, Reditrex, Rheumatrex
How Methotrexate interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryMethotrexate (trexall, Others) Moderate
Interaction Summary
Theoretically, red clover might increase the risk of methotrexate toxicity.
Read the full Red Clover Flower Extract, Dry + Methotrexate interactionMethotrexate SodiumXatmep
How Methotrexate Sodium interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryMethotrexate (trexall, Others) Moderate
Interaction Summary
Theoretically, red clover might increase the risk of methotrexate toxicity.
Read the full Red Clover Flower Extract, Dry + Methotrexate Sodium interactionNorelgestromin, Ethinyl EstradiolEvra, Ortho Evra
How Norelgestromin, Ethinyl Estradiol interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryEstrogens, Cytochrome P450 3a4 (cyp3a4) Substrates +1 Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover Flower Extract, Dry + Norelgestromin, Ethinyl Estradiol interactionNorethindrone Acetate, Ethinyl Estradiol, Ferrous FumarateLoMinastrin FE, Minastrin 24 FE
How Norethindrone Acetate, Ethinyl Estradiol, Ferrous Fumarate interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 1a2 (cyp1a2) Substrates, Estrogens +1 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Norethindrone Acetate, Ethinyl Estradiol, Ferrous Fumarate interactionOestrogenOestrogen
How Oestrogen interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 1a2 (cyp1a2) Substrates +1 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Oestrogen interactionPrasterone (prescription Drug)Intrarosa
How Prasterone (prescription Drug) interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryEstrogens Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover Flower Extract, Dry + Prasterone (prescription Drug) interactionRelugolix, Estradiol, Norethindrone AcetateMyfembree
How Relugolix, Estradiol, Norethindrone Acetate interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 1a2 (cyp1a2) Substrates +1 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Relugolix, Estradiol, Norethindrone Acetate interactionSegesterone Acetate, Ethinyl EstradiolAnnovera
How Segesterone Acetate, Ethinyl Estradiol interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryEstrogens, Cytochrome P450 1a2 (cyp1a2) Substrates +1 Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover Flower Extract, Dry + Segesterone Acetate, Ethinyl Estradiol interactionTamoxifen CitrateNolvadex, Soltamox
How Tamoxifen Citrate interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 2c9 (cyp2c9) Substrates +1 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Tamoxifen Citrate interactionTiboloneLivial
How Tibolone interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryEstrogens Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover Flower Extract, Dry + Tibolone interactionDrospirenone, Ethinyl Estradiol, LevomefolateBeyaz
How Drospirenone, Ethinyl Estradiol, Levomefolate interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates, Estrogens +1 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Drospirenone, Ethinyl Estradiol, Levomefolate interactionAdo-trastuzumab EmtansineKadcyla
How Ado-trastuzumab Emtansine interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Ado-trastuzumab Emtansine interactionAbciximabReoPro
How Abciximab interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryAnticoagulant/antiplatelet Drugs Minor
Interaction Summary
Although some laboratory research suggests that red clover may have anticoagulant and antiplatelet activity, clinical research has not shown this effect.
Read the full Red Clover Flower Extract, Dry + Abciximab interactionAbemaciclibVerzenio
How Abemaciclib interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Abemaciclib interactionAbiraterone
How Abiraterone interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Abiraterone interactionAbiraterone AcetateYonsa, Zytiga
How Abiraterone Acetate interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Abiraterone Acetate interactionAbrocitinibCibinqo
How Abrocitinib interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 2c19 (cyp2c19) Substrates, Cytochrome P450 2c9 (cyp2c9) Substrates +1 Minor
Interaction Summary
Theoretically, red clover might increase the levels and clinical effects of drugs metabolized by CYP2C19.
Read the full Red Clover Flower Extract, Dry + Abrocitinib interactionAcalabrutinibCalquence
How Acalabrutinib interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acalabrutinib interactionAcenocoumarolSintrom
How Acenocoumarol interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryAnticoagulant/antiplatelet Drugs Minor
Interaction Summary
Although some laboratory research suggests that red clover may have anticoagulant and antiplatelet activity, clinical research has not shown this effect.
Read the full Red Clover Flower Extract, Dry + Acenocoumarol interactionAcetaminophenChildren's Tylenol, Children's Tylenol Meltaways, Tylenol, Tylenol Ex Strength
How Acetaminophen interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 1a2 (cyp1a2) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen interactionAcetaminophen, AspirinGemnisyn
How Acetaminophen, Aspirin interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 1a2 (cyp1a2) Substrates, Anticoagulant/antiplatelet Drugs Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen, Aspirin interactionAcetaminophen, Aspirin, CaffeineExcedrin, Excedrin Extra Strength, Excedrin Migraine
How Acetaminophen, Aspirin, Caffeine interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryAnticoagulant/antiplatelet Drugs, Cytochrome P450 1a2 (cyp1a2) Substrates +2 Minor
Interaction Summary
Although some laboratory research suggests that red clover may have anticoagulant and antiplatelet activity, clinical research has not shown this effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen, Aspirin, Caffeine interactionAcetaminophen, Brompheniramine, PhenylpropanolamineDimetapp Cold and Flu
How Acetaminophen, Brompheniramine, Phenylpropanolamine interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 1a2 (cyp1a2) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen, Brompheniramine, Phenylpropanolamine interactionAcetaminophen, ButalbitalAxocet, Bancap, Bucet, Butex Forte, Esgic CF, Orbivan CF +5 more
How Acetaminophen, Butalbital interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 1a2 (cyp1a2) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen, Butalbital interactionAcetaminophen, Butalbital, CaffeineEsgic, Esgic Plus, Fiogesic, Fioricet, Repan, Tecnal +1 more
How Acetaminophen, Butalbital, Caffeine interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 1a2 (cyp1a2) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates +1 Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen, Butalbital, Caffeine interactionAcetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
How Acetaminophen, Butalbital, Caffeine, Codeine interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCaffeine, Cytochrome P450 1a2 (cyp1a2) Substrates +1 Minor
Interaction Summary
Theoretically, soy might reduce the clearance of caffeine; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen, Butalbital, Caffeine, Codeine interactionAcetaminophen, Butalbital, CodeineBancap w/ Codeine
How Acetaminophen, Butalbital, Codeine interacts with Red Clover — through 1 ingredient. Tap an ingredient for the detail:
Red Clover Flower Extract, DryCytochrome P450 1a2 (cyp1a2) Substrates Minor
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
Read the full Red Clover Flower Extract, Dry + Acetaminophen, Butalbital, Codeine interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Red Clover with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.
Red Clover Flower Extract, Dry
Estrogens
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Red clover contains phytoestrogens which might have estrogenic activity in some people. Theoretically, red clover might compete for estrogen receptors and interfere with estrogen-containing drug therapy.
Methotrexate (Trexall, Others)
Theoretically, red clover might increase the risk of methotrexate toxicity.
In a case report, a 52-year-old female receiving weekly methotrexate injections for psoriasis developed symptoms of methotrexate toxicity, including severe vomiting and epigastric pain, after three days of taking red clover 430 mg daily. Toxicity resolved after red clover was discontinued. However, no liver function tests or methotrexate levels were reported.
Tamoxifen (Nolvadex)
Theoretically, the phytoestrogens in red clover might interfere with tamoxifen.
In vitro and animal research suggests that genistein, a constituent of red clover, might antagonize the antitumor effects of tamoxifen. However, there is some evidence from an animal study that red clover does not reduce the efficacy of tamoxifen. Until more is known, tell patients taking tamoxifen to avoid red clover.
Anticoagulant/Antiplatelet Drugs
Although some laboratory research suggests that red clover may have anticoagulant and antiplatelet activity, clinical research has not shown this effect.
In vitro research suggests that genistein in red clover has antiplatelet effects, and historically, red clover was thought to have anticoagulant effects due to its coumarin content. However, some experts state that this is unlikely as most natural coumarins have not been shown to have anticoagulant effects, and their content in red clover is low. Additionally, some clinical research in postmenopausal patients found no effect on coagulation or prothrombin time with the use of red clover flowering tops 378 mg daily for 12 months or red clover isoflavone (Rimostil) 50 mg daily for 2 years.
Caffeine
Theoretically, soy might reduce the clearance of caffeine; however, a small clinical study found no effect.
Red clover contains genistein. Taking genistein 1 gram daily for 14 days seems to inhibit caffeine clearance and metabolism in healthy females. However, this effect does not seem to occur with the lower amounts of genistein found in red clover. A clinical study in healthy postmenopausal individuals shows that taking red clover capsules standardized to contain 60 mg isoflavones twice daily for 14 days does not affect the pharmacokinetics of caffeine.
Cytochrome P450 1A2 (Cyp1A2) Substrates
Theoretically, red clover might increase levels of drugs metabolized by CYP1A2; however, a small clinical study found no effect.
In vitro evidence shows that red clover inhibits CYP1A2. However, a clinical study in healthy postmenopausal individuals shows that taking red clover capsules standardized to contain 60 mg isoflavones twice daily for 14 days does not affect the pharmacokinetics of caffeine, a CYP1A2 probe substrate.
Cytochrome P450 2C19 (Cyp2C19) Substrates
Theoretically, red clover might increase the levels and clinical effects of drugs metabolized by CYP2C19.
In vitro evidence suggests that red clover weakly inhibits CYP2C19. This interaction has not been reported in humans.
Cytochrome P450 2C9 (Cyp2C9) Substrates
Theoretically, red clover might increase levels of drugs metabolized by CYP2C9; however, a small clinical study found no effect.
In vitro evidence suggests that red clover might inhibit CYP2C9. However, a clinical study in healthy postmenopausal individuals shows that taking red clover capsules standardized to contain 60 mg isoflavones twice daily for 14 days does not affect the pharmacokinetics of tolbutamide, a CYP2C9 probe substrate.
Cytochrome P450 3A4 (Cyp3A4) Substrates
Theoretically, red clover might increase levels of drugs metabolized by CYP3A4; however, a small clinical study found no effect.
In vitro evidence shows that red clover might inhibit CYP3A4 isoenzymes. However, a clinical study in healthy postmenopausal individuals shows that taking red clover capsules standardized to contain 60 mg isoflavones twice daily for 14 days does not affect the pharmacokinetics of alprazolam, a CYP3A4 probe substrate.
Brand information
Manufacturer and brand details for Red Clover, from the product label.
Hawaii Pharm
See all Hawaii Pharm products- Name
- Hawaii Pharm LLC
- Street Address
- 510 Sumner St. Ste. 613
- City
- Honolulu
- State
- HI
- ZipCode
- 96817
- Phone Number
- 888-854-2924
- Web Address
- www.hawaiipharm.com
Red Clover by Hawaii Pharm: Common Questions
Does Red Clover by Hawaii Pharm interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Can I take this if I'm pregnant or breastfeeding?
What are the most common side effects?
Does red clover actually work for hot flashes or menopause?
Is this product safe to use long-term?
Does red clover thin your blood?
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.
The Full Monographs Behind Red Clover’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
Red Clover's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 24 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.
Red Clover 24 references
- Kurzer MS, Xu X. Dietary phytoestrogens. Annu Rev Nutr 1997;17:353-81. PubMed
- 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
- Budzinski JW, Foster BC, Vandenhoek S, Arnason JT. An in vitro evaluation of human cytochrome P450 3A4 inhibition by selected commercial herbal extracts and tinctures. Phytomedicine 2000;7:273-82. PubMed
- This P, De La Rochefordiere A, Clough K, et al. Phytoestrogens after breast cancer. Endocr Relat Cancer 2001;8:129-34. PubMed
- Tice J, Cummings SR, Ettinger B, et al. Few adverse effects of two red clover extracts rich in phytoestrogens: a multicenter, placebo-controlled trial. Alt Ther 2001;7:S33.
- Ingram DM, Hickling C, West L, et al. A double-blind randomized controlled trial of isoflavones in the treatment of cyclical mastalgia. The Breast 2002;11:170-4. PubMed
- Unger M, Frank A. Simultaneous determination of the inhibitory potency of herbal extracts on the activity of six major cytochrome P450 enzymes using liquid chromatography/mass spectrometry and automated online extraction. Rapid Commun Mass Spectrom 2004;1 PubMed
- Cheong JL, Bucknall R. Retinal vein thrombosis associated with a herbal phytoestrogen preparation in a susceptible patient. Postgrad Med J 2005;81:266-7.. PubMed
- Geller SE, Shulman LP, van Breemen RB, et al. Safety and efficacy of black cohosh and red clover for the management of vasomotor symptoms: a randomized controlled trial. Menopause 2009;16:1156-66. PubMed
- Hidalgo LA, Chedraui PA, Morocho N, et al. The effect of red clover isoflavones on menopausal symptoms, lipids and vaginal cytology in menopausal women: a randomized, double-blind, placebo-controlled study. Gynecol Endocrinol 2005;21(5):257-264. PubMed
- Campbell MJ, Woodside JV, Honour JW, et al. Effect of red clover-derived isoflavone supplementation on insulin-like growth factor, lipid and antioxidant status in healthy female volunteers: a pilot study. Eur J Clin Nutr 2004;58(1):173-179. PubMed
- Guerrero JA, Lozano ML, Castillo J, et al. Flavonoids inhibit platelet function through binding to the thromboxane A2 receptor. J Thromb Haemost 2005;3(2):369-376. PubMed
- Kondo K, Suzuki Y, Ikeda Y, Umemura K. Genistein, an isoflavone included in soy, inhibits thrombotic vessel occlusion in the mouse femoral artery and in vitro platelet aggregation. Eur J Pharmacol 2002;455(1):53-57. PubMed
- Polini N, Rauschemberger MB, Mendiberri J, et al. Effect of genistein and raloxifene on vascular dependent platelet aggregation. Mol Cell Endocrinol 2007;267(1-2):55-62. PubMed
- Wuttke W, Jarry H, Seidlova-Wuttke D. Plant-derived alternative treatments for the aging male: facts and myths. Aging Male 2010;13(2):75-81. PubMed
- Villaseca P. Non-estrogen conventional and phytochemical treatments for vasomotor symptoms: what needs to be known for practice. Climacteric 2012;15(2):115-124. PubMed
- Chen, Y., Xiao, C. Q., He, Y. J., Chen, B. L., Wang, G., Zhou, G., Zhang, W., Tan, Z. R., Cao, S., Wang, L. P., and Zhou, H. H. Genistein alters caffeine exposure in healthy female volunteers. Eur.J Clin.Pharmacol. 2011;67(4):347-353. PubMed
- Friedman, J. A., Taylor, S. A., McDermott, W., and Alikhani, P. Multifocal and recurrent subarachnoid hemorrhage due to an herbal supplement containing natural coumarins. Neurocrit.Care 2007;7(1):76-80. PubMed
- Hooper, L., Madhavan, G., Tice, J. A., Leinster, S. J., and Cassidy, A. Effects of isoflavones on breast density in pre- and post-menopausal women: a systematic review and meta-analysis of randomized controlled trials. Hum.Reprod.Update. 2010;16(6):745-7 PubMed
- Orr A and Parker R. Red clover causing symptoms suggestive of methotrexate toxicity in a patient on high-dose methotrexate. Menopause Int. 2013;19(3):133-134. PubMed
- Clifton-Bligh PB, et al. Red cover isoflavones enriched with formononetin lower serum LDL cholesterol- a randomized, double-blind, placebo-controlled trial. Eur J Clin Nutr. 2015;69(1):134-142.
- Risk assessment for peri- and post-menopausal women taking food supplements containing isolated isoflavones. EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS). 2015. DOI
- Ferraris C, Ballestra B, Listorti C, et al. Red clover and lifestyle changes to contrast menopausal symptoms in premenopausal patients with hormone-sensitive breast cancer receiving tamoxifen. Breast Cancer Res Treat 2020;180(1):157-65. doi: 10.1007/s1054 PubMed
- Chen L, Choi J, Leonard SW, et al. No Clinically Relevant Pharmacokinetic Interactions of a Red Clover Dietary Supplement with Cytochrome P450 Enzymes in Women. J Agric Food Chem. 2020;68(47):13929-13939. PubMed
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