21st Century Glucosamine Chondroitin 500 mg/400 mg Capsules supplement bottle
21st Century

Glucosamine Chondroitin 500 mg/400 mg Capsules Review

What We Researched
6 active ingredients analyzed · 4 inactive ingredients decoded · 3 brand certifications checked · Last updated: Aug 2026
91
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
Potassium 195 mg 4%
Glucosamine Sulfate • 2KCl 1,500 mg **
Chondroitin Sulfate 1,200 mg **
Bioavailability Excellent

Absorption Rating

  • Potassium Good
  • Glucosamine Sulfate • 2KCl Good
  • Chondroitin Sulfate Good
Other Ingredients Excellent

Fillers & Additives

  • Gelatin
  • Magnesium Silicate
  • Magnesium Stearate
  • Stearic Acid
Efficacy Good

Dosage Analysis

  • Potassium 195 mg Under-dosed
  • Glucosamine Sulfate • 2KCl 1,500 mg Effective
  • Chondroitin Sulfate 1,200 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Calories 10
Total Carbohydrate 2 g 1%†
Sodium 120 mg 5%
Potassium 195 mg 4%
Glucosamine Sulfate • 2KCl 1,500 mg **
Chondroitin Sulfate 1,200 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Gelatin Safe

Forms the capsule shell that holds the supplement contents.

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.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

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
Related Supplements
Frequently Asked Questions
Is 21st Century Glucosamine Chondroitin 500 mg/400 mg Capsules a good supplement?

21st Century Glucosamine Chondroitin 500 mg/400 mg Capsules received a product quality score of 91/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 6 active ingredients with 20 servings per container. Of the 4 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 Glucosamine Chondroitin 500 mg/400 mg Capsules?

21st Century Glucosamine Chondroitin 500 mg/400 mg Capsules contains 6 active ingredients: Calories (10), Total Carbohydrate (2 g), Sodium (120 mg), Potassium (195 mg), Glucosamine Sulfate • 2KCl (1,500 mg), Chondroitin Sulfate (1,200 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is 21st Century Glucosamine Chondroitin 500 mg/400 mg Capsules safe to take?

21st Century Glucosamine Chondroitin 500 mg/400 mg Capsules 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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This is an important question for supplement consumers. The dietary supplement industry is largely self-regulated, which means product quality, ingredient transparency, and safety practices vary significantly between brands and products. The most reliable way to evaluate any supplement is to check for third-party testing certifications, review the full ingredient list and dosages, and research the brand's regulatory track record. GoodSupp's database of over 150,000 analyzed products provides independent quality scores, ingredient safety ratings, and brand trust reports to help you make evidence-based decisions.

How to use turmeric?

This is an important question for supplement consumers. The dietary supplement industry is largely self-regulated, which means product quality, ingredient transparency, and safety practices vary significantly between brands and products. The most reliable way to evaluate any supplement is to check for third-party testing certifications, review the full ingredient list and dosages, and research the brand's regulatory track record. GoodSupp's database of over 150,000 analyzed products provides independent quality scores, ingredient safety ratings, and brand trust reports to help you make evidence-based decisions.

How to take turmeric for inflammation?

This is an important question for supplement consumers. The dietary supplement industry is largely self-regulated, which means product quality, ingredient transparency, and safety practices vary significantly between brands and products. The most reliable way to evaluate any supplement is to check for third-party testing certifications, review the full ingredient list and dosages, and research the brand's regulatory track record. GoodSupp's database of over 150,000 analyzed products provides independent quality scores, ingredient safety ratings, and brand trust reports to help you make evidence-based decisions.

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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.