Rice ferment (sake lees extract) is a by-product of fermented rice used in sake production. It is rich in amino acids, vitamins and minerals that nourish the skin. Fermentation breaks down complex molecules into smaller compounds that can penetrate more deeply, enhancing hydration and improving texture. In Skin Emulsion, rice ferment works alongside squalane and hyaluronic acid to deliver balanced moisture and antioxidant protection.
How Is Rice Ferment Produced?
During sake brewing, rice is inoculated with koji mold, which converts starches into sugars. Yeast then ferments the sugars into alcohol, leaving behind fermented rice solids. These solids, known as sake kasu, are rich in nutrients. The extract is filtered, purified and incorporated into skincare formulations. Because fermentation pre-digests the nutrients, the extract is easily absorbed by the skin.
What Other Japanese Ingredients Enhance Skin Emulsion?
- Rice bran oil: High in vitamin E and gamma-oryzanol, it provides antioxidant protection and helps reduce hyperpigmentation.
- Camellia oil: Also known as tsubaki oil, it is a lightweight oil with high oleic acid content, offering deep moisturization without clogging pores.
- Seaweed extract: Contains polysaccharides and trace minerals that soothe and hydrate the skin.
These traditional Japanese ingredients are prized for their efficacy and have been used for centuries in beauty rituals. Modern formulations extract and stabilize their active compounds for use in facial-grade products.
Why Is Fermentation Popular in Skincare?
Fermentation creates beneficial enzymes, amino acids and organic acids that enhance the bioavailability of ingredients. It can also produce postbiotics that support the skin's microbiome. As consumers prioritize regenerative and microbiome-friendly formulas, fermented ingredients have gained popularity.
Key Takeaways
- Rice ferment is a nutrient-rich extract from fermented rice, offering hydration and antioxidant benefits.
- Production involves koji mold and yeast fermenting rice, leaving nutrient-dense sake kasu.
- Other Japanese ingredients include rice bran oil, camellia oil and seaweed extract.
- Fermentation increases bioavailability and supports the microbiome.
