Hydrolyzed Yeast

Hydrolyzed yeast is a processed form of yeast protein that has been broken down into smaller molecular fragments through enzymatic hydrolysis. This process yields bioactive peptides and amino acids that can penetrate the skin more effectively than larger protein molecules. Yeast itself is rich in B vitamins, minerals, and amino acids, making it a nutrient-dense source for skincare formulation.

In cosmetic products, hydrolyzed yeast functions primarily as a skin and hair conditioning agent. The peptides it contains are believed to support the skin's moisture barrier and may contribute antioxidant benefits, though the extent of these effects varies depending on the specific yeast strain and processing method used.

When yeast protein is hydrolysed, the enzymatic process breaks peptide bonds into shorter chains and individual amino acids. These smaller molecules are small enough to penetrate the outer layers of skin, where they can help attract and retain moisture. Amino acids are the building blocks of proteins naturally present in skin, so their presence may support the skin's natural repair processes.

Some yeast-derived peptides also possess antioxidant properties, meaning they can interact with free radicals and potentially reduce oxidative stress. This mechanism is thought to be particularly relevant for protecting skin from environmental damage, though the practical significance in finished skincare products depends on concentration and stability.

Hydrolyzed yeast is stable in most formulations and can be used daily as part of your regular skincare routine. It is often found in serums, moisturisers, and essences. There is no need to rotate it, and it works well alongside other conditioning or active ingredients. If using multiple hydrating products, layer from lightest to heaviest texture for optimal absorption.