Red Clover 350 mg Ingredients & Drug Interactions
What is this page for?
First and foremost: checking Red Clover 350 mg 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 350 mg is a dietary supplement by Nature's Answer with 2 active ingredients. 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. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Red Clover 350 mg by Nature's Answer
Ask about any prescription or over-the-counter medication and we check it for interactions with Red Clover 350 mg by Nature's Answer — 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 350 mg by Nature's Answer
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
Red Clover 350 mg contains 2 active ingredients: red clover and red clover whole herb extracts. Both come from the same plant and bring the same phytoestrogens—plant compounds with estrogenic activity—to the formula.
The capsules also contain inactive ingredients (rice flour, vegetable cellulose, and calcium silicate) that help deliver the active material.
Does it work?
Couldn't assess
The evidence for red clover's effectiveness isn't yet established in our data. We hold insufficient reliable evidence to rate it for androgenic alopecia (hair loss), menopausal symptoms, osteoarthritis, and osteoporosis.
That doesn't mean it doesn't work—it means the clinical trials we have aren't robust enough yet to say one way or the other. If you're thinking about using it for one of these purposes, talk with your doctor or pharmacist about what the current research shows and whether it's a fit for you.
How safe is it?
Well-documented data
Red clover is generally well tolerated in the short term by healthy adults, but its estrogenic effects mean certain people should be cautious. The most common side effects reported are muscle pain, nausea, and vaginal spotting.
There's also been concern about whether red clover's isoflavones might increase risk of estrogen-sensitive cancers like breast or uterine cancer; a meta-analysis of 8 trials found red clover and soy isoflavones may modestly increase breast density in premenopausal (not postmenopausal) women compared with placebo. During pregnancy, the safety data advises against red clover because of its estrogenic effects and lack of safety information.
While breastfeeding, there isn't enough safety information—talk with your doctor or pharmacist about whether to use it. Because of its estrogen-like activity, it's also wise to be cautious if you have a personal or family history of hormone-sensitive cancers.
Meds to double-check
Moderate interaction found
Before starting Red Clover 350 mg, check with your doctor or pharmacist if you take estrogens (including birth control or hormone replacement therapy), methotrexate, or tamoxifen—these carry Moderate-severity interaction concerns. Additionally, if you're on any medication processed by your liver (CYP1A2, CYP2C19, CYP2C9, or CYP3A4 substrates), or blood thinners or antiplatelet drugs, confirm it's safe first, though Minor interactions are less likely based on available clinical evidence.
The bottom line
Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.
Red Clover 350 mg may appeal to people exploring herbal options for menopausal symptoms, hair health, or bone support, but the evidence for those uses isn't yet established in our data. If you're on estrogen therapy, methotrexate, tamoxifen, or medications broken down by your liver, check with your doctor or pharmacist before taking this—especially if you're pregnant or breastfeeding.
The estrogenic activity and potential to interfere with certain drugs means a personal conversation with your healthcare provider makes sense.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 2 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated May 22, 2016.
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 350 mg, straight from the product label.
| Brand | Nature's Answer |
|---|---|
| Barcode (UPC) | 083000164231 |
| Net contents | 60 Vegetarian Capsule(s) |
| Market status | On market |
| Date entered into DSLD | May 22, 2016 |
| DSLD ID | 59753 |
| Product type | Botanical |
| Supplement form | Capsule |
| Dietary claims / uses | All Other |
| Intended target group(s) | Vegan, Vegetarian, 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 350 mg by Nature's Answer, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Red Clover | 50 mg | -- |
| Red Clover (Trifolium pratense) whole herb extracts | 300 mg | -- |
Other ingredients: Rice Flour, Vegetable Cellulose, Calcium Silicate
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)
Discover Nature's Answer and trust the difference... The true nature or our standards go way beyond the herb...
Advanced Botanical Fingerprint Technology
Discover Nature's Answer
2015 Nature’s Answer
Storage
Store in a cool, dry place.
Seals/Symbols
Gluten Free
General Statements
Since 1972
Formula
Trifolium pratense
FDA Statement of Identity
Dietary Supplement
Formulation
Gluten-Free
Vegetarian/Vegan
Suggested/Recommended/Usage/Directions
Suggested Use: As a dietary supplement, take one (1) capsule two (2) times a day with food or water.
Precautions
Warning: Keep out of reach of children.
Do not use if safety seal is damaged or missing.
Do not use if you are pregnant or nursing. If you are taking any medications, planning any medical procedure or have a medical condition, consult with your healthcare practitioner before use.
General
18423 Rev. 815
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Red Clover 350 mg by Nature's Answer 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 350 mg by Nature's Answer
These are the 2 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.
Red Clover
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 monograph & interactionsRed Clover (Trifolium pratense) whole herb extracts
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 (Trifolium pratense) whole herb extracts monograph & interactionsOther (inactive) ingredients: Rice Flour, Vegetable Cellulose, Calcium Silicate. These complete the product’s ingredient list but are not active constituents.
Red Clover 350 mg by Nature's Answer Drug Interactions
HelloPharmacist Interaction Report
Red Clover 350 mg by Nature's Answer interacts with medications through its phytoestrogen content.
The most serious concerns are with estrogens (birth control, hormone replacement therapy) and methotrexate, both at Moderate severity. Red clover's estrogenic activity may interfere with how estrogens work, and there's a case report of someone on methotrexate for psoriasis who developed severe toxicity symptoms after taking red clover daily.
Read the full breakdown — every affected drug type, severity by severity
Red clover also carries Moderate concerns with tamoxifen, a breast cancer drug. Lab and animal studies suggest red clover's constituents might reduce tamoxifen's effectiveness, though one animal study showed no such effect—the picture isn't completely clear yet.
At Minor severity, red clover may theoretically affect how your body breaks down several drug classes: medications processed by CYP1A2, CYP2C19, CYP2C9, and CYP3A4 liver enzymes. However, a small clinical study found no actual effect when people took red clover.
Red clover also theoretically has anticoagulant and antiplatelet activity, but clinical research hasn't confirmed this happens in practice.
Altogether, these interactions span 868 individual medications. Check your exact prescriptions with the tool on this page before starting.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Red Clover 350 mg?
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 350 mg interact with 867 drugs. Click any drug to see the details.
1 of the 2 ingredients in Red Clover 350 mg interact with drugs. Each result below shows which ingredient is responsible. Red Clover
Bazedoxifene Acetate, Conjugated EstrogensDuavee
How Bazedoxifene Acetate, Conjugated Estrogens interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Bazedoxifene Acetate, Conjugated Estrogens interactionConjugated EstrogensCenestin, Enjuvia, Premarin, Premarin Vaginal Cream
How Conjugated Estrogens interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome P450 3a4 (cyp3a4) Substrates, Estrogens 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 (trifolium Pratense) Whole Herb Extracts + Conjugated Estrogens interactionConjugated Estrogens, Medroxyprogesterone AcetatePremplus, Prempro
How Conjugated Estrogens, Medroxyprogesterone Acetate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Conjugated Estrogens, Medroxyprogesterone Acetate interactionConjugated Estrogens, MeprobamatePMB 200, PMB 400
How Conjugated Estrogens, Meprobamate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome P450 3a4 (cyp3a4) Substrates, Estrogens 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 (trifolium Pratense) Whole Herb Extracts + Conjugated Estrogens, Meprobamate interactionConjugated Estrogens, MethyltestosteronePremarin with Methyltestosterone
How Conjugated Estrogens, Methyltestosterone interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Conjugated Estrogens, Methyltestosterone interactionCyproterone Acetate, Ethinyl EstradiolDiane-35, Dianette
How Cyproterone Acetate, Ethinyl Estradiol interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Cyproterone Acetate, Ethinyl Estradiol interactionDesogestrel, Ethinyl EstradiolDesogen, Marvelon, Marvelon 21, Marvelon 28, Mircette, Ortho-Cept +2 more
How Desogestrel, Ethinyl Estradiol interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome P450 1a2 (cyp1a2) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates +2 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 (trifolium Pratense) Whole Herb Extracts + Desogestrel, Ethinyl Estradiol interactionDrospirenone, EstetrolNextstellis
How Drospirenone, Estetrol interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Drospirenone, Estetrol interactionDrospirenone, Ethinyl EstradiolAngeliq, Gianvi, Yasmin
How Drospirenone, Ethinyl Estradiol interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Drospirenone, Ethinyl Estradiol interactionEsterified EstrogensEstratab, Menest
How Esterified Estrogens interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Esterified Estrogens interactionEsterified Estrogens, MethyltestosteroneEstratest
How Esterified Estrogens, Methyltestosterone interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome P450 3a4 (cyp3a4) Substrates, Estrogens 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 (trifolium Pratense) Whole Herb Extracts + Esterified Estrogens, Methyltestosterone interactionEstradiolDivigel, Elestrin, Estrace, Estraderm, Estring, Evamist +6 more
How Estradiol interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Estradiol interactionEstradiol, MedroxyprogesteroneDivitren
How Estradiol, Medroxyprogesterone interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Estradiol, Medroxyprogesterone interactionEstradiol, Norethindrone AcetateActivella
How Estradiol, Norethindrone Acetate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Estradiol, Norethindrone Acetate interactionEstradiol, NorgestimateOrtho-Prefest
How Estradiol, Norgestimate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, Cytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover (trifolium Pratense) Whole Herb Extracts + Estradiol, Norgestimate interactionEstradiol, ProgesteroneBijuvanda
How Estradiol, Progesterone interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome P450 1a2 (cyp1a2) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates +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 (trifolium Pratense) Whole Herb Extracts + Estradiol, Progesterone interactionEstrogenEstrogen
How Estrogen interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Estrogen interactionEstroneOrtho-Est
How Estrone interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover (trifolium Pratense) Whole Herb Extracts + Estrone interactionEstropipateOgen, Ortho EST
How Estropipate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens Moderate
Interaction Summary
Theoretically, concomitant use of large amounts of red clover might interfere with estrogen therapy.
Read the full Red Clover (trifolium Pratense) Whole Herb Extracts + Estropipate interactionEthiny Estradiol, LevonorgestrelLogynon, Microgynon 30 ED
How Ethiny Estradiol, Levonorgestrel interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Ethiny Estradiol, Levonorgestrel interactionEthinyl EstradiolEstinyl
How Ethinyl Estradiol interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome P450 1a2 (cyp1a2) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates +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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol interactionEthinyl Estradiol, DesogestrelApri, Cesia, Cyclessa, Gedarel, Kariva, Linessa +4 more
How Ethinyl Estradiol, Desogestrel interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome P450 2c9 (cyp2c9) Substrates, Estrogens +2 Moderate
Interaction Summary
Theoretically, red clover might increase levels of drugs metabolized by CYP2C9; however, a small clinical study found no effect.
Read the full Red Clover (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Desogestrel interactionEthinyl Estradiol, DrospirenoneYaz
How Ethinyl Estradiol, Drospirenone interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Drospirenone interactionEthinyl Estradiol, Ethynodiol DiacetateDemulen 1/35, Demulen 1/50, Demulen Compack, Kelnor 1/35, Zovia, Zovia 1/35 +1 more
How Ethinyl Estradiol, Ethynodiol Diacetate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Ethynodiol Diacetate interactionEthinyl Estradiol, LevonorgestrelAlesse, Alesse 21, Alesse 28, Aviane, Enpresse, Jolessa +18 more
How Ethinyl Estradiol, Levonorgestrel interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Levonorgestrel interactionEthinyl Estradiol, NorethindroneAranelle, Brevicon, Brevicon .5/35 21 day, Brevicon .5/35 28 day, Brevicon 1/35 21 day, Brevicon 1/35 28 day +50 more
How Ethinyl Estradiol, Norethindrone interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Norethindrone interactionEthinyl Estradiol, Norethindrone, Ferrous FumarateEstrostep Fe, Femcon FE, Junel Fe 1.5/30, Loestrin Fe, Loestrin Fe 1.5/30, Loestrin Fe 1/20 +3 more
How Ethinyl Estradiol, Norethindrone, Ferrous Fumarate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Norethindrone, Ferrous Fumarate interactionEthinyl Estradiol, NorgestimateCilest, Mononessa, Ortho Tri-Cyclen 28, Ortho Tri-Cyclen Lo, Ortho Tri-Cylcen, Ortho-Cyclen +5 more
How Ethinyl Estradiol, Norgestimate interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Norgestimate interactionEthinyl Estradiol, NorgestrelCryselle, Lo/Ovral, Low-Ogestrel, Ogestrel 0.5/50, Ovral
How Ethinyl Estradiol, Norgestrel interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsCytochrome 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Norgestrel interactionEthinyl Estradiol, LevonogestrelLybrel
How Ethinyl Estradiol, Levonogestrel interacts with Red Clover 350 mg — through 1 ingredient. Tap an ingredient for the detail:
Red Clover (trifolium Pratense) Whole Herb ExtractsEstrogens, 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 (trifolium Pratense) Whole Herb Extracts + Ethinyl Estradiol, Levonogestrel interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Red Clover 350 mg 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
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 350 mg, from the product label.
Nature's Answer
See all Nature's Answer products- Name
- Nature's Answer
- City
- Hauppauge
- State
- NY
- ZipCode
- 11788-3943
- Phone Number
- (800) 439-2324
- Web Address
- www.naturesanswer.com
Red Clover 350 mg by Nature's Answer: Common Questions
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The Full Monographs Behind Red Clover 350 mg’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 350 mg'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