Calcium Ascorbate
AKA “Ascorbic acid calcium salt, Calcium diascorbate, Calcium ascorbate anhydrous, Hemicalcium ascorbate, Calci-C, L-Ascorbic acid, calcium salt (2:1), Calcium ascorbate (e 302)”
Vitamin
Ingredient Facts
Calcium ascorbate
AKA: Ascorbic acid calcium salt, Calcium diascorbate, Calcium ascorbate anhydrous, Hemicalcium ascorbate, Calci-C, L-Ascorbic acid, Calcium salt (2:1), Calcium ascorbate (e 302)
Vitamin · Antioxidant · EWG: 2
Synthetic
Antioxidant
Anti-Aging
Brightener
Skin Conditioner
Barrier Support
Vitamin C
Vitamin
Clean
A stabilized form of vitamin C that protects skin from environmental damage and helps maintain a healthy, conditioned complexion.
Solubility INSOL IN ETHER
Formula
C12H14CaO12
Mol. Weight
390.31
CAS #
5743-27-1
Form
Powder
State
White to slightly pale greyish-yellow odourless crystalline powder
See origin →
Functions
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
Anti-Aging
Targets fine lines, wrinkles, or loss of firmness. Works by boosting collagen, speeding cell turnover, or both.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Brightening
Fades dark spots, evens out skin tone, or adds radiance. Works by slowing melanin production or speeding up cell turnover.
Skin Protecting
Helps rebuild and strengthen your skin barrier — the invisible shield that keeps moisture in and irritants out. Essential after over-exfoliating or harsh weather.
Locks in moisture
Neutralizes free radicals
Traditional Use
A stabilized form of vitamin C developed in the 20th century to improve the shelf-life and bioavailability of ascorbic acid in skincare products. Used in modern cosmetics since the 1980s as an antioxidant and collagen-boosting ingredient.
Skin Types
●all-skin-types, gentle
Best For
Dullness
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Final Report on the Safety Assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and Sodium Ascorbyl Phosphate as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Calcium Ascorbate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
Calcium Ascorbate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Agarose-silver particles films: Effect of calcium ascorbate in nanoparticles synthesis and film properties.
Onofre-Cordeiro NA, Silva YEO, Solidônio EG, de Sena KXFR, Silva WE et al.
International journal of biological macromolecules, 2018
Topical L-ascorbic acid: percutaneous absorption studies.
Pinnell SR, Yang H, Omar M, Monteiro-Riviere N, DeBuys HV et al.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.], 2001
Topical L-ascorbic acid: percutaneous absorption studies.
Pinnell SR, Yang H, Omar M, Monteiro-Riviere N, DeBuys HV et al.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.], 2001
Topical L-ascorbic acid: percutaneous absorption studies.
Pinnell SR, Yang H, Omar M, Monteiro-Riviere N, DeBuys HV et al.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.], 2001
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR