Pure Encapsulations Ester-C & Flavonoids supplement bottle
Pure Encapsulations

Ester-C & Flavonoids

What We Researched
5 active ingredients analyzed · 3 inactive ingredients decoded · 2 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
75
Product Score Fair
77
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin C (as Ester-C Calcium Ascorbate) 619 mg 688%
Calcium (as Ester-C Calcium Ascorbate) 68 mg 5%
Threonic Acid (as Ester-C) 7 mg
Quercetin 50 mg
Rutin 100 mg
Bioavailability Very Good

Absorption Rating

  • Vitamin C (as Ester-C Calcium Ascorbate) Good
  • Calcium (as Ester-C Calcium Ascorbate) Good
  • Quercetin Fair
  • Rutin Fair
Other Ingredients Excellent

Fillers & Additives

  • Cellulose
  • Water
  • Ascorbyl Palmitate
Efficacy Poor

Dosage Analysis

  • Vitamin C (as Ester-C Calcium Ascorbate) 619 mg Effective
  • Calcium (as Ester-C Calcium Ascorbate) 68 mg Under-dosed
  • Quercetin 50 mg Under-dosed
  • Rutin 100 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin C (as Ester-C Calcium Ascorbate) 619 mg 688%
Calcium (as Ester-C Calcium Ascorbate) 68 mg 5%
Threonic Acid (as Ester-C) 7 mg
Quercetin 50 mg
Rutin 100 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Water Safe

Dissolves and carries water-soluble ingredients.

Ascorbyl Palmitate Safe

Prevents oxidation and extends shelf life of oil-based supplements.

Price Comparison

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

Brand Trust Report
Pure Encapsulations

Founded 1991 · Sudbury, Massachusetts, United States · 228 products · pureencapsulations.com

Certifications

2 certifications
Fda Gmp Inspections Verified Source
Nsf Gmp Verified Source

Transparency

3 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source
Related Supplements
Frequently Asked Questions
Is Pure Encapsulations Ester-C & Flavonoids a good supplement?

Pure Encapsulations Ester-C & Flavonoids received a product quality score of 75/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 5 active ingredients with 180 servings per container. All 3 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Pure Encapsulations, holds a brand trust score of 77/100 with 2 verified certifications including Fda Gmp Inspections, Nsf Gmp.

What are the ingredients in Pure Encapsulations Ester-C & Flavonoids?

Pure Encapsulations Ester-C & Flavonoids contains 5 active ingredients: Vitamin C (as Ester-C Calcium Ascorbate) (619 mg), Calcium (as Ester-C Calcium Ascorbate) (68 mg), Threonic Acid (as Ester-C) (7 mg), Quercetin (50 mg), Rutin (100 mg). Notable high-dose ingredients include Vitamin C at 688% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Pure Encapsulations Ester-C & Flavonoids safe to take?

Pure Encapsulations Ester-C & Flavonoids has been analyzed for ingredient safety across all its components. All 3 inactive ingredients — including capsule materials, fillers, and binders — are rated safe based on regulatory data and published safety research. This is a clean formulation with no controversial additives. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Pure Encapsulations a trustworthy supplement brand?

Pure Encapsulations receives a brand trust score of 77/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1991 and headquartered in Sudbury, Massachusetts, United States, the company offers 228 products in their lineup. They hold 2 verified certifications including Fda Gmp Inspections, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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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.