How we scored it
Native structural protein from vertebrate hair, wool or feathers; built entirely from amino acids, natural origin per protein convention.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.
Where it comes from
Extracted from animal sources such as wool, feathers or hair, typically with mild processing to make it usable in cosmetic formulations. No synthetic route is used commercially.
In plain English
A natural protein extracted from animal hair, wool or feathers, rich in the amino acid cystine. Used in hair and skin products to help condition and strengthen.
CosIng definition: Keratins. Natural, fibrous proteins occurring in vertebrates. They contain all of the common amino acids and are characterized by high cystine content
References
- 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
- 2KERATIN. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 3KERATIN. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=KERATIN