21st Century Standardized Black Cohosh Soy Isoflavones Vegetarian supplement bottle
21st Century

Standardized Black Cohosh Soy Isoflavones Vegetarian Review

What We Researched
2 active ingredients analyzed · 5 inactive ingredients decoded · 3 brand certifications checked · Last updated: Aug 2026
93
Product Score Excellent
85
Brand Score Good

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Black Cohosh Extract (as Cimicifuga racemosa) 100 mg
Soy Isoflavones 80 mg
Bioavailability Very Good

Absorption Rating

  • Black Cohosh Extract (as Cimicifuga racemosa) Good
  • Soy Isoflavones Fair
Other Ingredients Excellent

Fillers & Additives

  • Rice Bran
  • Oat Fiber
  • Vegetable Cellulose
  • Magnesium Silicate
  • Magnesium Stearate
Efficacy Excellent

Dosage Analysis

  • Black Cohosh Extract (as Cimicifuga racemosa) 100 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Black Cohosh Extract (as Cimicifuga racemosa) 100 mg
Soy Isoflavones 80 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Rice Bran Safe

Natural filler and source of fiber.

Oat Fiber Generally_safe

It is used as a filler or source of fiber.

Vegetable Cellulose Safe

Forms a vegetarian capsule shell alternative to gelatin.

Magnesium Silicate Generally_safe

It is used to improve powder flow and prevent clumping.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Brand Trust Report
21st Century

Founded 1991 · Tempe, Arizona, United States · 383 products · 21stcenturyvitamins.com/

Certifications

3 certifications
Nsf Gmp Verified Source
NSF Contents Certified Verified
NSF Certified Verified

Transparency

5 claims
Third Party Testing Claim — Claimed Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source
Contains Proprietary Blend — True

Violation History

4 incidents
Prop 65 Lead2021-06-22Source
Recall Vitamin D3 5000 IU Tablets2021-05-19Source
Lawsuit False advertising of Glucosamine/Chondroitin supplements.2012Source
Prop 65 Lead2008-12-23Source
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Frequently Asked Questions
Is 21st Century Standardized Black Cohosh Soy Isoflavones Vegetarian a good supplement?

21st Century Standardized Black Cohosh Soy Isoflavones Vegetarian received a product quality score of 93/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients with 100 servings per container. Of the 5 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, 21st Century, holds a brand trust score of 85/100 with 3 verified certifications including Nsf Gmp, NSF Contents Certified, NSF Certified.

What are the ingredients in 21st Century Standardized Black Cohosh Soy Isoflavones Vegetarian?

21st Century Standardized Black Cohosh Soy Isoflavones Vegetarian contains 2 active ingredients: Black Cohosh Extract (as Cimicifuga racemosa) (100 mg), Soy Isoflavones (80 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is 21st Century Standardized Black Cohosh Soy Isoflavones Vegetarian safe to take?

21st Century Standardized Black Cohosh Soy Isoflavones Vegetarian has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is 21st Century a trustworthy supplement brand?

21st Century receives a brand trust score of 85/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1991 and headquartered in Tempe, Arizona, United States, the company offers 383 products in their lineup. They hold 3 verified certifications including Nsf Gmp, NSF Contents Certified, NSF Certified. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: 21st Century has 4 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.