Methionine ●
TL;DR. This ingredient is used mainly as a skin- and hair-conditioning amino acid. It can support humectancy, improve feel, and contribute to antioxidant-support claims in formulas.
What does Methionine do in a cosmetic formula?
This ingredient is used mainly as a skin- and hair-conditioning amino acid. It can support humectancy, improve feel, and contribute to antioxidant-support claims in formulas.
Is Methionine clean?
It is generally well tolerated in rinse-off and leave-on products, with low irritation and sensitization concerns at typical cosmetic use levels. It is not a common clean-standard restricted-list ingredient.
Is Methionine sustainable?
This material can be made by fermentation or chemical synthesis, so sourcing matters for its sustainability profile. It is expected to be biodegradable and is not associated with environmental persistence or bioaccumulation concerns.
Is Methionine COSMOS-approved?
It can align with COSMOS-natural or COSMOS-organic when sourced from natural origin feedstocks and made through permitted processes. From a Green Chemistry view, fermentation-derived supply is the stronger fit because it uses renewable inputs and gives a readily biodegradable molecule.
How does Methionine work chemically?
The molecule is a sulfur-containing alpha-amino acid with a thioether side chain, and it behaves as a zwitterion in water depending on pH. It is typically used at low levels in aqueous phases, often around 0.01% to 1%, and it is most compatible in mildly acidic to neutral formulations.
Last updated 2026-05-13