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21st Century B-50 Complex, Prolonged Release supplement bottle
21st Century

B-50 Complex, Prolonged Release Review

What We Researched
· 12 inactive ingredients decoded · 3 brand certifications checked · Page generated: Sep 2026
86
Product Score Good
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 Fair

Supplement Facts

No supplement facts data available.

Bioavailability N/A

Absorption Rating

No ingredient forms matched our reference database.

Other Ingredients Very Good

Fillers & Additives

  • Cellulose
  • Stearic Acid
  • Hydroxypropyl Methylcellulose
  • Silicon Dioxide
  • Gum Acacia
  • Dicalcium Phosphate
  • Ethylcellulose
  • Magnesium Silicate
  • Magnesium Stearate
  • Polyethylene Glycol Low
  • Polysorbate Medium
  • Polyvinyl Alcohol
Efficacy N/A

Dosage Analysis

Dosage data not available for assessment.

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Hydroxypropyl Methylcellulose Safe

It is used as a coating for tablets and capsules.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Gum Acacia Safe

It is used as a thickener, binder, or emulsifier.

Dicalcium Phosphate Safe

Serves as both a filler and a supplemental source of calcium and phosphorus.

Ethylcellulose Generally_safe

It is used as a coating to control the release of supplement ingredients.

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.

Polyethylene Glycol Caution

It is used as a binder, coating agent, or to improve solubility.

Polysorbate Generally_safe

It is used to help mix oil and water-based ingredients.

Polyvinyl Alcohol Generally_safe

It is used as a coating for tablets or capsules.

Brand Trust Report
21st Century

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

Certifications

3 certifications
Nsf Gmp Source available Primary evidence
NSF Contents Certified Supporting evidence unavailable
NSF Certified Supporting evidence unavailable

Transparency

5 claims
Third Party Testing Claim — Claimed Evidence available Evidence
Testing Lab Disclosure — Verified Evidence available Evidence
In House Testing — Verified Evidence available Evidence
Contains Proprietary Blend — True Brand claim; evidence unavailable

Violation History

4 incidents
Prop 65 Lead2021-06-22 Source available Primary source
Recall Vitamin D3 5000 IU Tablets2021-05-19 Source available Primary source
Lawsuit False advertising of Glucosamine/Chondroitin supplements.2012 Source available Primary source
Prop 65 Lead2008-12-23 Source available Primary source
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Frequently Asked Questions
Is 21st Century B-50 Complex, Prolonged Release a good supplement?

21st Century B-50 Complex, Prolonged Release received a product quality score of 86/100 in GoodSupp's independent analysis, indicating strong overall quality. Of the 12 inactive ingredients, 11 are rated safe and 1 ingredient is flagged for review. The manufacturer, 21st Century, holds a brand trust score of 85/100.

Is 21st Century B-50 Complex, Prolonged Release safe to take?

GoodSupp reviewed the inactive-ingredient data available for 21st Century B-50 Complex, Prolonged Release. Of 12 inactive ingredients, 11 are rated safe. 1 ingredient is flagged for review: Polyethylene Glycol. 'Caution' doesn't mean dangerous — it indicates the ingredient has some considerations worth being aware of, such as potential sensitivities or ongoing research. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. 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. 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.