L-Proline ●
TL;DR. This ingredient is mainly a humectant and skin-conditioning amino acid, helping bind water in the stratum corneum and support a smoother feel. It is often used in moisturizers, serums, hair care, and barrier-support formulas.
What does L-Proline do in a cosmetic formula?
This ingredient is mainly a humectant and skin-conditioning amino acid, helping bind water in the stratum corneum and support a smoother feel. It is often used in moisturizers, serums, hair care, and barrier-support formulas.
Is L-Proline clean?
From a clean beauty perspective, this ingredient is generally well-tolerated and has little restricted-list friction. Sensitization is not a common concern at cosmetic use levels.
Is L-Proline sustainable?
This material can be made by fermentation or protein hydrolysis, with renewable feedstocks possible depending on supplier route. It is water-soluble and readily biodegradable, so persistence is not a major concern.
Is L-Proline COSMOS-approved?
It is permitted under COSMOS natural and organic when the feedstock and processing route meet the standard. Its profile fits Green Chemistry well when produced by fermentation, with good biodegradability and low concern for long-term environmental buildup.
How does L-Proline work chemically?
The molecule is a naturally occurring, water-soluble amino acid with a five-membered ring structure, so it behaves as a small zwitterionic humectant in water-based formulas. Typical use levels are often around 0.1% to 2%, and it is generally stable across normal cosmetic pH ranges.
Last updated 2026-05-13