Seiwa Kasei

Seiwa Kasei is a Japanese specialty chemical company focused on the research, development, and manufacture of functional ingredients for the cosmetics and pharmaceutical sectors. Established in 1958, the company is a leader in the production of hydrolyzed proteins and peptides, marketed under the Promois brand, which are used extensively in hair and skin care. They are also recognized for their innovative Amitose series, featuring stable vitamin C derivatives that provide moisturizing and antioxidant benefits. Seiwa Kasei's expertise extends to the creation of biomimetic ingredients, such as pseudo-ceramides, designed to enhance the skin's natural barrier function. The company serves a global clientele, providing high-quality raw materials backed by rigorous safety and efficacy testing.