Keratin is a class of fibrous structural proteins; the human body contains 54 subtypes, which are widely distributed in various tissues including the skin, cornea, hair, and nails. Keratin is rich in cysteine and forms a robust, network-like structure through disulfide bonds, endowing it with exceptional mechanical strength and chemical stability. It can effectively resist damage from physical friction, ultraviolet radiation, and other factors. Moreover, keratin participates in signal transduction and physiological regulation; its functional deficiency can easily lead to disorders affecting the skin, cornea, liver, and hair, among other tissues.

Recombinant Keratin is a novel biomaterial prepared through synthetic biology techniques, based on human keratin genes, and produced via microbial fermentation, expression, and purification processes. It features high activity, high stability, high purity, and high-density expression, and can be widely used in the fields of biomedicine and beauty & personal care.