21st Century Horse Chestnut Extract 300 mg supplement bottle
21st Century

Horse Chestnut Extract 300 mg Review

What We Researched
1 active ingredient analyzed · 7 inactive ingredients decoded · 3 brand certifications checked · Last updated: Aug 2026
100
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
Standardized Horse Chestnut Extract (Aesculus hippocastanum) (seed) 600 mg **
Bioavailability Excellent

Absorption Rating

  • Standardized Horse Chestnut Extract (Aesculus hippocastanum) (seed) Good
Other Ingredients Excellent

Fillers & Additives

  • Cellulose
  • Oat Fiber
  • Rice Bran
  • Maltodextrin (Non-GMO)
  • Magnesium Silicate
  • Silicon Dioxide
  • Magnesium Stearate
Efficacy Excellent

Dosage Analysis

  • Standardized Horse Chestnut Extract (Aesculus hippocastanum) (seed) 600 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Standardized Horse Chestnut Extract (Aesculus hippocastanum) (seed) 600 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Oat Fiber Generally_safe

It is used as a filler or source of fiber.

Rice Bran Safe

Natural filler and source of fiber.

Maltodextrin (Non-GMO) Generally_safe

It is used to add bulk or improve texture.

Magnesium Silicate Generally_safe

It is used to improve powder flow and prevent clumping.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

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 Horse Chestnut Extract 300 mg a good supplement?

21st Century Horse Chestnut Extract 300 mg received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients with 30 servings per container. Of the 7 inactive ingredients, 4 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 Horse Chestnut Extract 300 mg?

21st Century Horse Chestnut Extract 300 mg contains 1 active ingredients: Standardized Horse Chestnut Extract (Aesculus hippocastanum) (seed) (600 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is 21st Century Horse Chestnut Extract 300 mg safe to take?

21st Century Horse Chestnut Extract 300 mg 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.