Yeast Amino Acids

Yeast amino acids are naturally occurring compounds extracted from yeast cells. They consist of a blend of amino acids and other hydrophilic (water-loving) molecules that yeast produces as part of its cellular structure. In skincare formulations, they function primarily as humectants—ingredients that attract and bind water to the skin's surface.Because yeast amino acids are derived from a natural fermentation source, they offer a gentle alternative to some synthetic humectants. They work by drawing moisture from the environment and the deeper layers of skin into the outer layers, helping to…

Yeast amino acids work as humectants through their hygroscopic nature—they have a molecular structure that naturally attracts water molecules. When applied to the skin, they form weak hydrogen bonds with water molecules both in the air and in the deeper layers of the epidermis, drawing this moisture to the surface where it can improve hydration levels.Additionally, the amino acid profile provides building blocks that support the skin's natural moisturising factors (NMF), which are responsible for maintaining hydration within the stratum corneum. This dual action makes them useful in formula…

Yeast amino acids work best in hydrating serums and moisturisers where they can be applied to clean skin. For optimal hydration benefit, apply to damp skin and follow with an occlusive moisturiser to seal in the water they've drawn to the surface. They are stable across most formulations and can be layered with other active ingredients without concern, making them a useful addition to multi-step routines.

Yeast amino acids are generally well-tolerated across skin types. However, anyone with a known yeast sensitivity or allergy should patch test first, as the ingredient is yeast-derived.