What it is
This material is produced by fermenting Saccharomyces yeast, breaking open (lysing) the cells to release their internal contents, and then filtering to remove cell debris. The resulting liquid is rich in yeast-derived components such as amino acids, peptides, beta-glucans, vitamins, and sugars that are used in skincare for hydrating and conditioning the skin. It is commonly included at modest levels to support skin feel and moisturization.
Safety & warnings
Yeast lysate filtrates are generally well tolerated at cosmetic use levels. People with a known sensitivity to yeast-derived ingredients may occasionally react, so a patch test is sensible for reactive skin. It is not regarded as a meaningful comedogen.
Origin & sourcing
Biotechnological. It is derived from cultured Saccharomyces yeast that is fermented, lysed to release intracellular material, and filtered.
Questions everyone asks
How is a lysate different from a ferment extract?
A lysate is made by rupturing the yeast cells to release their internal contents, whereas a plain ferment extract draws mainly on substances released into the fermentation broth.
Does it offer sun protection?
No. It is a conditioning ingredient and contributes no UV filtering.