How we scored it
Amino acids/peptides from hydrolysis of yeast protein; hydrolysis reagents leave no mass → 1.0.
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
Produced by acid, alkaline or enzymatic hydrolysis of Saccharomyces cerevisiae cell protein. This is the only significant commercial route.
In plain English
A conditioning ingredient made by breaking down yeast protein into smaller peptides and amino acids. Used in hair and skin products to help moisturize and condition, derived entirely from fermented yeast.
CosIng definition: Protein hydrolyzates, yeast. Substance obtained by acidic, alkaline, or enzymatic hydrolysis of saccharomyces cerevisiae composed primarily of amino acids, peptides, and proteins. It may contain impurities consisting chiefly of carbohydrates and lipids along with smaller quantities of miscellaneous organic substances of biological origin
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.
- 2HYDROLYZED YEAST PROTEIN. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 3HYDROLYZED YEAST PROTEIN. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=HYDROLYZED%20YEAST%20PROTEIN