Rice Ferment Filtrate
What is Rice Ferment Filtrate?
Rice Ferment Filtrate, commonly known as Sake in skincare, is a liquid byproduct obtained from the fermentation of rice using koji mold (Aspergillus oryzae) during sake production. It is rich in amino acids, peptides, vitamins (especially B vitamins), minerals, and fermented polysaccharides that enhance skin penetration and efficacy. This ingredient is widely used in Japanese skincare for its hydrating and brightening properties derived from traditional sake brewing.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Skin protecting
Forms a barrier to protect skin from external irritants.
Humectant
Attracts and holds water in the stratum corneum, boosting hydration and plumpness; commonly used in moisturizers, cleansers, and hair conditioners.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
Soothing
Helps reduce the feeling of discomfort and visible irritation by supporting skin calmness, often through anti-irritant, barrier-supporting, or cooling mechanisms.
Antioxidant
Slows oxidation of oils, fragrances, and sensitive actives to improve shelf life and reduce rancidity or color change; sometimes also supports skin protection from oxidative stress.