Ascorbyl Stearate
AKA “L-Ascorbic acid, 6-octadecanoate, L-Ascorbic acid monostearate, vitamin c stearate, INS NO.305, E-305, INS-305, L-ASCORBYL 6-OCTADECANOATE”
Vitamin C
Ingredient Facts
Ascorbyl stearate
AKA: L-Ascorbic acid, 6-octadecanoate, L-Ascorbic acid monostearate, Vitamin c stearate, INS NO.305, E-305, INS-305, L-ASCORBYL 6-OCTADECANOATE
Vitamin C · Antioxidant · EWG: 1
Plant-Derived Synthetic
Antioxidant
Skin Conditioner
Vitamin C
Clean
A plant-derived antioxidant that helps protect skin from environmental damage and supports a brighter, more youthful complexion.
Formula
C24H42O7
Mol. Weight
442.60
CAS #
25395-66-8
Form
Liquid
See origin →
Functions
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Neutralizes Free Radicals
Traditional Use
Created as a lipid-soluble form of vitamin C in the late 20th century to improve stability and allow incorporation into emollient formulations while maintaining antioxidant activity.
Skin Types
●all-skin-types, gentle
Best For
Sun Damage
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Final Report on the Safety Assessment of Ascorbyl Palmitate, Ascorbyl Dipalmitate, Ascorbyl Stearate, Erythorbic Acid, and Sodium Erythorbate
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
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
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR