Rice Ferment Lees

Rice ferment lees is the sediment left behind after rice-based fermentation processes, such as sake or traditional rice wine production. During fermentation, microorganisms break down the rice starches and proteins, creating a nutrient-rich residue that contains amino acids, peptides, and lipophilic compounds including ceramides and glucosylceramides.In skincare, rice ferment lees functions as a humectant and skin conditioner. It absorbs water and helps the skin retain moisture, whilst the fermentation byproducts support the skin's natural barrier function and overall texture.

Rice ferment lees works through multiple mechanisms. As a humectant, it hygroscopically binds water molecules and draws them into the epidermis, improving skin hydration. The fermentation process enriches the material with ceramides and other lipids, which reinforce the stratum corneum barrier and reduce water loss.Additionally, the amino acids and peptides present support skin resilience and structure, whilst certain fermentation byproducts may help counteract oxidative stress and support cellular health.

Rice ferment lees is typically found in serums, essences, and moisturisers. Apply to damp skin to maximise the humectant effect, as this helps draw water into the epidermis. It pairs well with occlusives (such as oils or butters) layered on top to seal in hydration. It can be used daily, morning and evening, as part of a standard skincare routine.

Rice ferment lees is generally well-tolerated and considered safe for topical use. Individuals with rice allergies or sensitivities to fermented ingredients should patch-test first.