Life Extension Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets supplement bottle
Life Extension

Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets

What We Researched
5 active ingredients analyzed · 9 inactive ingredients decoded · 3 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
68
Product Score Fair
86
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin C (as ascorbic acid) 500 mg 556%
Calcium (as calcium carbonate) 79 mg 6%
Magnesium (as magnesium hydroxide) 8 mg 2%
Bio-Quercetin® Proprietary Blendproviding 35% quercetin (5 mg) [from Japanese sophora concentrate (flower bud)], 30% galactomannans (4 mg) [from fenugreek (seed)] 14 mg **
Bioperine® piperine [from black pepper extract (fruit)] 3 mg **
Bioavailability Fair

Absorption Rating

  • Vitamin C (as ascorbic acid) Fair
  • Calcium (as calcium carbonate) Fair
  • Magnesium (as magnesium hydroxide) Poor
  • Bio-Quercetin® Proprietary Blendproviding 35% quercetin (5 mg) [from Japanese sophora concentrate (flower bud)], 30% galactomannans (4 mg) [from fenugreek (seed)] Fair
  • Bioperine® piperine [from black pepper extract (fruit)] Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Stearic Acid
  • Maltodextrin
  • Croscarmellose Sodium
  • Vegetable Stearate
  • Silica
  • Coating (glycerin, purified water, hypromellose)
  • Sunflower Lecithin
  • Sunflower Oil
Efficacy Poor

Dosage Analysis

  • Vitamin C (as ascorbic acid) 500 mg Effective
  • Calcium (as calcium carbonate) 79 mg Under-dosed
  • Magnesium (as magnesium hydroxide) 8 mg Under-dosed
  • Bioperine® piperine [from black pepper extract (fruit)] 3 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin C (as ascorbic acid) 500 mg 556%
Calcium (as calcium carbonate) 79 mg 6%
Magnesium (as magnesium hydroxide) 8 mg 2%
Bio-Quercetin® Proprietary Blendproviding 35% quercetin (5 mg) [from Japanese sophora concentrate (flower bud)], 30% galactomannans (4 mg) [from fenugreek (seed)] 14 mg **
Bioperine® piperine [from black pepper extract (fruit)] 3 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Vegetable Stearate Safe

Prevents ingredients from sticking to equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Coating (glycerin, purified water, hypromellose) Unknown
Sunflower Lecithin Safe

Helps mix oil and water-based ingredients. Allergen-free alternative to soy lecithin.

Sunflower Oil Safe

Helps dissolve and absorb fat-soluble vitamins.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$22$20$19$17$16 Mar 12 $19.50$18.00
iHerb
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Life Extension

Founded 1980 · Fort Lauderdale, Florida, USA · 352 products · lifeextension.com

Certifications

3 certifications
Consumerlab Verified Source
Fda Gmp Inspections Verified Source
Nsf Gmp Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Claimed

Violation History

2 incidents
Prop 65 Lead2018-04-13Source
Fda Warning Making drug claims for dietary supplements, suggesting they can treat, mitigate, or prevent diseases such as breast cancer and Alzheimer's.2017-02-01Source
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Frequently Asked Questions
Is Life Extension Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets a good supplement?

Life Extension Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets received a product quality score of 68/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 5 active ingredients Of the 9 inactive ingredients, 7 are rated safe and 0 are flagged for review. The manufacturer, Life Extension, holds a brand trust score of 86/100 with 3 verified certifications including Consumerlab, Fda Gmp Inspections, Nsf Gmp.

What are the ingredients in Life Extension Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets?

Life Extension Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets contains 5 active ingredients: Vitamin C (as ascorbic acid) (500 mg), Calcium (as calcium carbonate) (79 mg), Magnesium (as magnesium hydroxide) (8 mg), Bio-Quercetin® Proprietary Blendproviding 35% quercetin (5 mg) [from Japanese sophora concentrate (flower bud)], 30% galactomannans (4 mg) [from fenugreek (seed)] (14 mg), Bioperine® piperine [from black pepper extract (fruit)] (3 mg). Notable high-dose ingredients include Vitamin C at 556% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Life Extension Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets safe to take?

Life Extension Fast-C® and Bio-Quercetin®, 60 Vegetarian Tablets 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 Life Extension a trustworthy supplement brand?

Life Extension receives a brand trust score of 86/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1980 and headquartered in Fort Lauderdale, Florida, USA, the company offers 352 products in their lineup. They hold 3 verified certifications including Consumerlab, Fda Gmp Inspections, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Life Extension has 2 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. 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.