ASCORBYL ACID ●
TL;DR. This ingredient is a water-soluble antioxidant and skin-conditioning active used to support brighter-looking, more even-toned skin. It can also help protect formulas and skin surface lipids from oxidation.
What does ASCORBYL ACID do in a cosmetic formula?
This ingredient is a water-soluble antioxidant and skin-conditioning active used to support brighter-looking, more even-toned skin. It can also help protect formulas and skin surface lipids from oxidation.
Is ASCORBYL ACID clean?
Clean frameworks generally view it as well accepted, with the main caveat being potential stinging or irritation in low-pH, high-strength leave-on formulas. It is not a common restricted-list ingredient.
Is ASCORBYL ACID sustainable?
This material is commonly made from glucose through fermentation and chemical conversion, with plant-derived feedstocks possible. It is water soluble and readily biodegradable, so persistence concerns are low.
Is ASCORBYL ACID COSMOS-approved?
It is permitted under COSMOS-natural and can be used in COSMOS-organic formulas when the final formulation meets the standard. It fits Green Chemistry reasonably well through renewable feedstock potential, biodegradability, and a well-established low-residue manufacturing profile.
How does ASCORBYL ACID work chemically?
The molecule is a small, water-soluble lactone with enediol chemistry, which gives strong reducing power but also makes it prone to oxidation in water, air, heat, light, and higher pH. Leave-on formulas often use about 5% to 20% at an acidic pH around 2.5 to 3.5, with stability improved by low-oxygen packaging, chelators, and compatible antioxidants.
Last updated 2026-08-17