L Lactic Acid ●
TL;DR. This ingredient is primarily used as an alpha hydroxy acid exfoliant and pH adjuster. It can also support hydration by increasing water-binding in the outer skin layer at lower use levels.
What does L Lactic Acid do in a cosmetic formula?
This ingredient is primarily used as an alpha hydroxy acid exfoliant and pH adjuster. It can also support hydration by increasing water-binding in the outer skin layer at lower use levels.
Is L Lactic Acid clean?
From a clean-beauty perspective, it is broadly accepted and has little restricted-list friction. The main watchpoint is concentration and finished-formula pH, since stronger exfoliating formats can cause stinging or barrier discomfort for some users.
Is L Lactic Acid sustainable?
This material is commonly made by fermentation of plant-derived sugars and is readily biodegradable. Its sustainability profile is generally favorable, with impacts mainly tied to the agricultural feedstock and processing inputs.
Is L Lactic Acid COSMOS-approved?
It is generally permitted under COSMOS natural and organic standards when produced from approved natural fermentation sources and meeting purity requirements. It aligns well with Green Chemistry principles through renewable feedstocks, efficient aqueous processing, and strong biodegradability.
How does L Lactic Acid work chemically?
The molecule is a small chiral alpha-hydroxy carboxylic acid with a pKa around 3.86, high water solubility, and pH-dependent activity. In leave-on cosmetics it is often used around 1 to 10 percent, with exfoliating performance increasing at lower pH and more neutralized forms behaving more like buffering or humectant salts.
Last updated 2026-05-13