Major interaction on record — check this product against your medications before combining. Based on 3 of 4 ingredients. Check your meds →
Dietary supplement

Ultra Isoflavone 100 Ingredients & Drug Interactions

by NaturesPlus

Ultra Isoflavone 100 label
See full label image
Tablet Or Pill Category: Other Combinations
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Ultra Isoflavone 100 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: Major

Ultra Isoflavone 100 is a dietary supplement by NaturesPlus with 4 active ingredients. Its ingredients are commonly taken for alcohol cravings and reduction, menopausal symptoms, heart and blood vessel health.Based on those ingredients, 1,340 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Soybean concentrate, Isoflavones. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Ultra Isoflavone 100 by NaturesPlus

Ask about any prescription or over-the-counter medication and we check it for interactions with Ultra Isoflavone 100 by NaturesPlus — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Ultra Isoflavone 100 by NaturesPlus

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 11, 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 4 of its 10 active ingredients.
  • “Isoflavones” is listed as a grouped ingredient — the label gives one combined amount (100 mg) without saying how much of each component you get.
  • “Isoplex” is listed as a grouped ingredient — the label gives one combined amount (1,500 mg) without saying how much of each component you get.

Ultra Isoflavone 100 contains 10 active ingredients — five isoflavone compounds (daidzin, glycitin, genistin, genistein, and daidzein), plus soybean concentrate and soy germ extract (both sources of isoflavones), kudzu root (radix puerariae), and two blends called Isoplex and Isoflavones that are made up of the individual ingredients already listed. These isoflavones are plant compounds with estrogenic activity thought to support bone health, blood sugar control, cholesterol levels, and blood pressure.

The product also contains inactive ingredients — microcrystalline cellulose, cellulose, hydroxypropyl methylcellulose, stearic acid, dicalcium phosphate, magnesium stearate, silica, and pharmaceutical glaze — which are excipients used as binders and fillers in the tablet.

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
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: breast, ovarian, uterine and bone health.
  • We looked for evidence on: Breast cancer-related hot flashes, Menopausal symptoms, Osteoporosis, Cardiovascular disease (CVD), Coronary heart disease (CHD), Heart failure — and 3 related terms.
  • The strongest evidence on file: Soy is rated "Possibly Effective" for Osteoporosis (Natural Medicines).
  • Also on file: Soy is rated "Possibly Effective" for Menopausal symptoms.
  • Also on file: Soy is rated "Possibly Ineffective" for Breast cancer-related hot flashes.

The soy-derived isoflavones in this product have been rated possibly effective for diabetes, high cholesterol (hyperlipidemia), osteoporosis, high blood pressure (hypertension), and diarrhea. The kudzu extract is rated possibly effective for alcohol use disorder, but carries insufficient evidence for hay fever, angina, and back pain.

The evidence, ingredient by ingredient Kudzu Red Clover Soy

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

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

Why this rating?
  • We hold adverse-effect (side-effect) data for 3 of the 3 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 3 of 3.
  • General safety write-ups exist for 3 of 3.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Orally, soy is generally well tolerated, though the most common side effects are bloating, constipation, diarrhea, and nausea. Some people have experienced allergic reactions including skin rash and itching.

The safety notes caution that while soy foods in normal dietary amounts are fine, concentrated isoflavone supplements like this one deserve more caution and should be avoided without medical advice. Kudzu is generally well tolerated in short-term studies, but long-term safety isn't well established.

Reported side effects have included nausea, heartburn, bloating, hives, and dizziness, though these did not occur more often than placebo. Pregnancy safety data advises against use during pregnancy; there is too little safety information to recommend use while breastfeeding.

Soy foods are commonly eaten while breastfeeding, but concentrated supplements have not been well studied.

Side effects, ingredient by ingredient Kudzu Red Clover Soy

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 3 of the 3 matched ingredients can interact with medications — Red Clover, Kudzu, Soy.
  • The most serious interaction on file is rated Major.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; diabetes medications.
  • For scale: 1,341 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 you take Ultra Isoflavone 100, check with us if you take monoamine oxidase inhibitors (MAOIs) — this is a major interaction. You should also double-check moderate interactions with blood pressure drugs, diabetes medications, estrogen or hormone replacement therapy, blood thinners (anticoagulants) like warfarin, levothyroxine (thyroid medication), diuretics, methotrexate, tamoxifen, and caffeine.

Use the medication checker below to see if any of your drugs are affected.

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 for its stated purpose. Major medication interactions have been identified, and safety information is well characterized.

This product may be of interest if you're looking to address blood sugar, cholesterol, bone health, or blood pressure with an isoflavone supplement — but only if you don't take an MAOI or any blood pressure, diabetes, thyroid, or blood-thinning medication without checking first. Talk with your pharmacist before starting, especially if you're pregnant, breastfeeding, or take any prescription medications.

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

Assessment coverage: 5 of 10 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Nov 22, 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

At a glance

General information

Key facts about Ultra Isoflavone 100, straight from the product label.

Brand NaturesPlus
Barcode (UPC) 097467049703
Net contents 60 Tablet(s)
Market status On market
Date entered into DSLD Nov 22, 2023
DSLD ID 298629
Product type Other Combinations
Supplement form Tablet Or Pill
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegetarian, Adult (18 - 50 Years), Gluten Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Ultra Isoflavone 100 by NaturesPlus, 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:
2 Tablet(s)
Maximum serving Sizes:
2 Tablet(s)
Servings per container
30
UPC/BARCODE
097467049703
IngredientAmount% DV
Daidzin0 NP--
Glycitin0 NP--
Genistin0 NP--
Genistein27 mg--
Daidzein35 mg--
Isoflavones100 mg--
Soybean concentrate0 NP--
Soy Germ extract0 NP--
Glycitein5 mg--
Puerarin33 mg--
Isoplex1500 mg--
Radix puerariae0 NP--

Other ingredients: Microcrystalline Cellulose, Cellulose, Hydroxypropyl Methylcellulose, Stearic Acid, Dicalcium Phosphate, Magnesium Stearate, Silica, Pharmaceutical Glaze

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formula

Ultra Isoflavone 100 is a maximum-strength isoflavone supplement with a broad spectrum of isoflavones, including Genistein, Daidzein & Puerarin. The superior isoflavones in this unique formula promote breast, ovarian and uterine health in women and prostate health in men. Most importantly, these isoflavones have been shown to promote healthy immune defenses, with noteworthy effects in postmenopausal women.

Soy derived Genistein, Daidzein and Puerarin

Formulation

They also support healthy heart function and bone density.

Free from artificial colors and artificial preservatives. Gluten Free

Vegetarian

Hormone Support

Storage

Keep tightly closed in a cool, dry place.

Precautions

Keep out of reach of children.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Directions: Two tablets once daily.

Brand IP Statement(s)

Copyright Natural Organics

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

See for yourself

Ultra Isoflavone 100 by NaturesPlus label

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

Ultra Isoflavone 100 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 Ultra Isoflavone 100 by NaturesPlus

These are the 4 active ingredients this product is made of. Select any to open its full monograph.

Serving size2 Tablet(s) Dosage formTablet Or Pill Servings per container30 Amounts shown are per serving.

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

Isoflavones

Interacts with
584 drugs
100 mg per serving

Kudzu is a fast-growing vine whose root has long been used in traditional Chinese medicine and is now studied mostly for reducing alcohol intake. Earl...

Isoflavones monograph & interactions
  • › Daidzin
  • › Glycitin
  • › Genistin
  • › Genistein
  • › Daidzein
  • › Glycitein
  • › Puerarin

Isoplex

1500 mg per serving

Other (inactive) ingredients: Microcrystalline Cellulose, Cellulose, Hydroxypropyl Methylcellulose, Stearic Acid, Dicalcium Phosphate, Magnesium Stearate, Silica, Pharmaceutical Glaze. These complete the product’s ingredient list but are not active constituents.

Interaction report

Ultra Isoflavone 100 by NaturesPlus Drug Interactions

Want to check YOUR meds against Ultra Isoflavone 100?

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
1,340Drugs
9 Major 746 Moderate 585 Minor

Ingredients driving the most interactions

Soybean concentrate 611
Isoflavones 584

Individual Drug Interactions

The ingredients in Ultra Isoflavone 100 interact with 1,340 drugs. Click any drug to see the details.

2 of the 4 ingredients in Ultra Isoflavone 100 interact with drugs. Each result below shows which ingredient is responsible. Soybean concentrate Isoflavones

Each ingredient & the kinds of drugs it affects

For each ingredient in Ultra Isoflavone 100 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.

Soybean concentrate12 drug types · 611 drugs

Monoamine Oxidase Inhibitors (Maois)

Taking soy products containing high amounts of tyramine along with MAOIs can increase the risk of hypertensive crisis.
Fermented soy products such as tofu and soy sauce contain tyramine, a naturally occurring chemical that affects blood pressure regulation. The metabolism of tyramine is decreased by MAOIs. Consuming more than 6 mg of tyramine while taking an MAOI can increase the risk of hypertensive crisis. The amount of tyramine in fermented soy products is usually less than 0.6 mg per serving; however, there can be significant variation depending on the specific product used, storage conditions, and length of storage. Storing one brand of tofu for a week can increase tyramine content from 0.23 mg to 4.8 mg per serving. Advise patients taking MAOIs to avoid fermented soy products that contain high amounts of tyramine.

Likelihood Likely Evidence C
Antidiabetes Drugs

Soy can lower blood glucose and have additive effects with antidiabetes drugs.
Clinical research shows that whole soy diets and soy-based meals reduce fasting glucose levels in diabetic and non-diabetic individuals. Also, individuals following a soy-based meal replacement plan seem to require lower doses of sulfonylureas and metformin to manage blood glucose levels when compared with individuals following a diet plan recommended by the American Diabetes Association.

Likelihood Possible Evidence A
Antihypertensive Drugs

Theoretically soy protein may have additive effects with antihypertensive drugs and increase the risk of hypotension.
Although some contradictory research exists, most clinical evidence suggests that consuming soy protein modestly reduces systolic and diastolic blood pressure in individuals with prehypertension or hypertension.

Likelihood Possible Evidence A
Caffeine

Theoretically, soy might reduce the clearance of caffeine.
Soy contains genistein. Taking genistein 1 gram daily for 14 days seems to inhibit caffeine clearance and metabolism in healthy females. This effect has been attributed to inhibition of the cytochrome P450 1A2 (CYP1A2) enzyme, which is involved in caffeine metabolism. It is unclear if this effect occurs with the lower amounts of genistein found in soy.

Likelihood Possible Evidence D
Diuretic Drugs

Theoretically, soy might have additive effects when used with diuretic drugs.
Animal research suggests that genistein, a soy isoflavone, increases diuresis within 6 hours of subcutaneous administration in rats. The effects seem to be similar to those of furosemide. This effect has not been reported in humans.

Likelihood Possible Evidence D
Estrogens

Theoretically, soy might competitively inhibit the effects of estrogen replacement therapy.
Soy contains phytoestrogens and has been shown to have estrogenic activity in some patients. Although this has not been demonstrated in humans, theoretically, concomitant use of soy with estrogen replacement therapy might reduce the effects of the estrogen replacement therapy.

Likelihood Possible Evidence D
Levothyroxine (Synthroid, Others)

Soy products might reduce the absorption of levothyroxine in some patients.
Preliminary clinical research and a case report suggest that soy-based formulas inhibit the absorption of levothyroxine in infants with congenital hypothyroidism. A levothyroxine dosage increase may be needed for infants with congenital hypothyroidism while using soy-based formulas, and the dose may need to be reduced when soy-based formulas are no longer administered. However, in postmenopausal adults, clinical research shows that taking a single dose of soy extract containing isoflavones 60 mg along with levothyroxine does not affect the oral bioavailability of levothyroxine.

Likelihood Possible Evidence B
Progesterone

Theoretically, combining soy isoflavones with transdermal progesterone may worsen bone density.
Clinical research suggests that significant bone loss may occur in females with osteoporosis who receive a combination of transdermal progesterone with soy milk containing isoflavones when compared with placebo, soy milk alone, or progesterone alone.

Likelihood Possible Evidence A
Tamoxifen (Nolvadex)

Theoretically, estrogenic soy isoflavones might alter the effects of tamoxifen.
Laboratory research suggests that genistein and daidzen, isoflavones from soy, can antagonize the antitumor effects of tamoxifen under some circumstances; however, soy isoflavones might have different effects when used at different doses. A relatively low in vitro concentration of soy isoflavones such as 1 microM/L seems to interfere with tamoxifen, whereas high in vitro concentrations such as those >10 microM/L might actually enhance tamoxifen effects. People on a high-soy diet have soy isoflavones levels ranging from 0.1-6 microM/L. Until more is known, advise patients taking tamoxifen to avoid therapeutic use of soy products.

Likelihood Possible Evidence B
Warfarin (Coumadin)

Theoretically, soy might interfere with the effects of warfarin.
Soy milk has been reported to decrease the international normalized ratio (INR) in a patient taking warfarin. The mechanism of this interaction is not known. However, animal and in vitro research suggests that soy may also inhibit platelet aggregation. Dosing adjustments for warfarin may be necessary.

Likelihood Possible Evidence D
Antibiotic Drugs

Theoretically, antibiotics may decrease the activity of soy isoflavones.
Intestinal bacteria are responsible in part for converting soy isoflavones into their active forms. Antibiotics may decrease the amount of intestinal bacteria and decrease its ability to convert isoflavones.

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

Soy might modestly induce CYP2C9 enzymes. However, this effect does not seem to be clinically significant.
In vitro research suggests that an unhydrolyzed soy extract might induce CYP2C9. However, the significance of this interaction is likely minimal. In healthy females taking a specific extract of soy (Genistein Soy Complex, Source Naturals), blood levels of losartan, a CYP2C9 substrate, were not significantly affected.

Likelihood Unlikely Evidence D
Soybean concentrate full monograph & interactions

Isoflavones7 drug types · 584 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, kudzu may increase the risk of bleeding if used with antiplatelet or anticoagulant drugs.
Kudzu isoflavones are reported to have antiplatelet activity.

Likelihood Possible Evidence D
Caffeine

Theoretically, taking kudzu with caffeine might increase levels of caffeine.
In healthy males injected with the kudzu constituent puerarin, caffeine clearance and metabolism is inhibited. This effect has been attributed to inhibition of cytochrome P450 1A2 (CYP1A2) enzyme, which is involved in caffeine metabolism. It is unclear if taking kudzu orally would have this same effect.

Likelihood Probable Evidence D
Estrogens

Theoretically, kudzu might alter the effects of estrogen therapy.
Some research suggests that kudzu has estrogenic effects. This may enhance or inhibit the effects of estrogen therapy.

Likelihood Possible Evidence B
Hepatotoxic Drugs

Theoretically, concomitant use might have additive hepatotoxic effects.
There is some concern that kudzu can adversely affect the liver.

Likelihood Possible Evidence D
Methotrexate (Trexall, Others)

Theoretically, taking kudzu with methotrexate might increase the risk of methotrexate toxicity.
Preclinical research suggests that kudzu extract greatly reduces the elimination and increases the toxicity of methotrexate. Kudzu might inhibit organic anion transporters (OATs) that are responsible for hepatobiliary and renal excretion of anions, similar to the interaction between methotrexate and non-steroidal anti-inflammatory drugs (NSAIDs).

Likelihood Possible Evidence D
Tamoxifen (Nolvadex)

Theoretically, kudzu might interfere with tamoxifen activity.
Some research suggests that kudzu may have estrogenic effects.

Likelihood Possible Evidence B
Antidiabetes Drugs

Theoretically, taking kudzu with antidiabetes drugs might increase the risk of hypoglycemia.
Kudzu might lower blood glucose levels and have additive effects in patients treated with antidiabetic agents. The dose of diabetes medications might need to be adjusted.

Likelihood Unlikely Evidence D
Isoflavones full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Ultra Isoflavone 100, from the product label.

NaturesPlus

See all NaturesPlus products
Name
Natural Organics Laboratories, Inc. makers of Nature's Plus
Street Address
9500 New Horizons Blvd
City
Amityville
State
New York
ZipCode
11701
Web Address
www.naturesplus.com
Pharmacist Counseling Corner

Ultra Isoflavone 100 by NaturesPlus: Common Questions

Does Ultra Isoflavone 100 by NaturesPlus interact with any medications?
Yes. Based on its ingredients, Ultra Isoflavone 100 has a known interaction with 1,340 medications, including 9 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Ultra Isoflavone 100 contains 4 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.
Will this product help my blood sugar or cholesterol?
The soy isoflavones in Ultra Isoflavone 100 are rated possibly effective for both diabetes and high cholesterol. That means some research supports their use, but the evidence isn't definitive. Talk with your doctor about whether this fits into your overall plan.
What are the most common side effects?
The most common side effects from soy are bloating, constipation, diarrhea, and nausea. Some people have had allergic reactions like rash or itching. Most people tolerate soy well overall.
Can I take this while pregnant or breastfeeding?
The safety data advises against use during pregnancy. While soy foods are commonly eaten while breastfeeding, concentrated supplements like this haven't been well studied in that setting. Talk with your doctor or pharmacist about what's right for you.
What are isoflavones and what do they do in this product?
Isoflavones are plant compounds found in soy and kudzu that act somewhat like estrogen in your body. This product uses them to theoretically support bone health, blood sugar control, cholesterol levels, and blood pressure.
Why do I need to check with a pharmacist about medications?
Both the soy and kudzu in this product can interact with many common drugs — especially blood pressure medications, diabetes drugs, blood thinners, and thyroid medicine. Some interactions are serious, so it's important to check before you start.

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

Not sure if Ultra Isoflavone 100 is safe with your meds?

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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.

Ultra Isoflavone 100 label
Go deeper

The Full Monographs Behind Ultra Isoflavone 100’s Ingredients

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

Herb & supplement monograph

Kudzu

Interacts with 584 drugs

Kudzu is a fast-growing vine whose root has long been used in traditional Chinese medicine and is now studied mostly for reducing alcohol intake. Early research is promising for cutting back...

Read the full Kudzu monograph → Herb & supplement monograph

Red Clover

Interacts with 867 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 flashes. The evidence is mixed and genera...

Read the full Red Clover monograph → Herb & supplement monograph

Soy

Interacts with 611 drugs

Soy is a nutritious bean that is a staple food and a popular source of plant protein and isoflavones. Eating soy foods as part of a balanced diet is generally considered safe for most people...

Read the full Soy monograph →
Sources

Sources & How We Checked

Ultra Isoflavone 100'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 133 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
  1. Kurzer MS, Xu X. Dietary phytoestrogens. Annu Rev Nutr 1997;17:353-81. 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. 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
  4. This P, De La Rochefordiere A, Clough K, et al. Phytoestrogens after breast cancer. Endocr Relat Cancer 2001;8:129-34. PubMed
  5. 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.
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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.
  22. 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
  23. 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
  24. 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

See these in context on the Red Clover monograph →

Kudzu 21 references
  1. Woo J, Lau E, Ho SC, et al. Comparison of Pueraria lobata with hormone replacement therapy in treating the adverse health consequences of menopause. Menopause 2003;10:352-61. PubMed
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