EsterC 24 Hour Immune Support, 90 Vegetarian Coated Tablets supplement bottle
EsterC

24 Hour Immune Support, 90 Vegetarian Coated Tablets

What We Researched
3 active ingredients analyzed · 7 inactive ingredients decoded · 1 retailer compared · Last updated: Mar 2026
83
Product Score Good
62
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin C (as Ester-C® Calcium Ascorbate) 1,000 mg 1,111%
Calcium (as Ester-C® Calcium Ascorbate) 110 mg 8%
C-Sorb™ Citrus Bioflavonoid ComplexCitrus Bioflavonoid Complex (Citrus spp.) (peel and fruit), Sweet Orange, Tangerine, Lime, Lemon, Acerola Extract, Rutin, Hesperidin Complex (Citrus spp.) (peel), Naturally Occurring Vitamin C Metabolites 204 mg **
Bioavailability Excellent

Absorption Rating

  • Vitamin C (as Ester-C® Calcium Ascorbate) Good
  • Calcium (as Ester-C® Calcium Ascorbate) Good
  • C-Sorb™ Citrus Bioflavonoid ComplexCitrus Bioflavonoid Complex (Citrus spp.) (peel and fruit), Sweet Orange, Tangerine, Lime, Lemon, Acerola Extract, Rutin, Hesperidin Complex (Citrus spp.) (peel), Naturally Occurring Vitamin C Metabolites Good
Other Ingredients Excellent

Fillers & Additives

  • Vegetable Cellulose
  • Calcium Silicate
  • Maltodextrin
  • Natural Palm Leaf Glaze
  • Triacetin
  • Vegetable Magnesium Stearate
  • Vegetable Stearic Acid
Efficacy Poor

Dosage Analysis

  • Vitamin C (as Ester-C® Calcium Ascorbate) 1,000 mg Effective
  • Calcium (as Ester-C® Calcium Ascorbate) 110 mg Under-dosed
  • C-Sorb™ Citrus Bioflavonoid ComplexCitrus Bioflavonoid Complex (Citrus spp.) (peel and fruit), Sweet Orange, Tangerine, Lime, Lemon, Acerola Extract, Rutin, Hesperidin Complex (Citrus spp.) (peel), Naturally Occurring Vitamin C Metabolites 204 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin C (as Ester-C® Calcium Ascorbate) 1,000 mg 1,111%
Calcium (as Ester-C® Calcium Ascorbate) 110 mg 8%
C-Sorb™ Citrus Bioflavonoid ComplexCitrus Bioflavonoid Complex (Citrus spp.) (peel and fruit), Sweet Orange, Tangerine, Lime, Lemon, Acerola Extract, Rutin, Hesperidin Complex (Citrus spp.) (peel), Naturally Occurring Vitamin C Metabolites 204 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Vegetable Cellulose Safe

Forms a vegetarian capsule shell alternative to gelatin.

Calcium Silicate Safe

Prevents ingredient clumping during manufacturing.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Natural Palm Leaf Glaze Safe

It is used to give tablets a shiny coating.

Triacetin Generally_safe

It is used as a solvent or humectant.

Vegetable Magnesium Stearate Safe

Prevents ingredients from sticking to equipment. Derived from vegetable sources.

Vegetable Stearic Acid Generally_safe

It is used to prevent ingredients from sticking to manufacturing equipment.

Price Comparison

iHerb $13.90 $0.31 / serving
Best Price

Price History

Tracked across major retailers. Updated periodically.

$15$14$13$12$11 Mar 12 $13.00
iHerb

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

Brand Trust Report
EsterC

Founded 1980 · Vevey, Vaud, Switzerland · 2 products · ester-c.com/

Transparency

3 claims
Third Party Testing Claim — Claimed
In House Testing — Verified Source

Violation History

4 incidents
Lawsuit A class-action lawsuit alleges that The Bountiful Company misrepresents its salmon oil supplement as being made from 'Wild Alaskan Salmon'.2025Source
Prop 65 Lead2023-03-28Source
Lawsuit The Bountiful Company was charged by the FTC with "review hijacking" on Amazon for its Nature's Bounty and Sundown brands.2023Source
Lawsuit False and misleading advertising regarding immune support claims.2013Source
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Frequently Asked Questions
Is EsterC 24 Hour Immune Support, 90 Vegetarian Coated Tablets a good supplement?

EsterC 24 Hour Immune Support, 90 Vegetarian Coated Tablets received a product quality score of 83/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 3 active ingredients with 45 servings per container. Of the 7 inactive ingredients, 4 are rated safe and 0 are flagged for review. The manufacturer, EsterC, holds a brand trust score of 62/100.

What are the ingredients in EsterC 24 Hour Immune Support, 90 Vegetarian Coated Tablets?

EsterC 24 Hour Immune Support, 90 Vegetarian Coated Tablets contains 3 active ingredients: Vitamin C (as Ester-C® Calcium Ascorbate) (1,000 mg), Calcium (as Ester-C® Calcium Ascorbate) (110 mg), C-Sorb™ Citrus Bioflavonoid ComplexCitrus Bioflavonoid Complex (Citrus spp.) (peel and fruit), Sweet Orange, Tangerine, Lime, Lemon, Acerola Extract, Rutin, Hesperidin Complex (Citrus spp.) (peel), Naturally Occurring Vitamin C Metabolites (204 mg). Notable high-dose ingredients include Vitamin C at 1,111% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is EsterC 24 Hour Immune Support, 90 Vegetarian Coated Tablets safe to take?

EsterC 24 Hour Immune Support, 90 Vegetarian Coated 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 EsterC a trustworthy supplement brand?

EsterC receives a brand trust score of 62/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1980 and headquartered in Vevey, Vaud, Switzerland, the company offers 2 products in their lineup. Note: EsterC 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. 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.