Seiwa Kasei Co., Ltd.

Rice-derived glucosylceramide is a sphingolipid extracted from rice germ or rice bran, used in both ingestible supplements and topical cosmetics. Japanese FFC notifications cite effects on skin moisture retention. Production leverages Japan's rice-milling byproducts, aligning with sustainability positioning.

Water-soluble silk protein extracted from the cocoon of Bombyx mori silkworms. Historically a by-product of fibroin (fiber-grade silk) extraction, sericin's high serine content (~30%) gives it strong film-forming and humectant properties for skincare formulations. Japan's silk industry — concentrated in Gunma, Nagano, and Saitama — has rebuilt around high-grade sericin production since the 2000s, using cocoons from JA Silk and small remaining sericulture cooperatives. Used in moisturisers, hair-care, and increasingly in injectable/wound-care medical applications.

The structural protein of silk (~70-75% of cocoon mass), with hydrolysed forms used in cosmetics and biomedical applications. Distinct from sericin (the gum coating), fibroin's beta-sheet crystal structure gives it superior film-forming and tensile properties; medical-grade fibroin scaffolds are emerging in wound dressings and tissue engineering. Japanese sericulture in Gunma, Nagano, and Saitama supplies cocoon stock; specialty processors hydrolyse fibroin for cosmetic ingredient grades. Often paired with sericin in moisture-and-strengthening positioning.