Skin Conditioning
RICE FERMENT LEES
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
The lees (residue) from sake rice fermentation — a traditional Japanese skincare ferment rich in peptides and enzymes. Gentle and well-tolerated.
Rice Ferment Lees is the INCI for sakekasu — the sedimentation/residue left after pressing sake from fermented rice mash. It is a complex biological matrix containing yeast-derived peptides, enzymes (proteases, amylases), amino acids, polysaccharides, and minor amounts of ethanol. It has a centuries-long tradition in Japanese skin care (the famous "geisha hands" observation drove modern interest). The ingredient is generally well-tolerated at cosmetic use levels (0.5-5%), with low irritation or sensitization profile. Cosmetic efficacy data is largely supplier-driven and traditional; no dedicated CIR/SCCS review exists. Purification and microbial stability matter — the raw material is a complex food.
Skin benefits
- Sake-lees derived postbiotic — traditional Japanese skin-care ingredient
- Contains amino acids, peptides, enzymes, and polysaccharides
- Claimed brightening and conditioning effects
- Low-irritation in cosmetic use
Known concerns
- Variable composition by producer and batch
- Residual ethanol content varies
- Limited peer-reviewed efficacy data
- Some fermentation-derived proteins could be allergens
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related skin conditionings
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.