FSS Kerazyme® Protect is a biotechnology‑derived active specifically engineered to protect and reinforce keratin-based structures, with primary application in hair care and secondary relevance for barrier-support skincare. It is based on an enzymatic protein complex designed to interact selectively with damaged keratin fibers and vulnerable peptide bonds that are weakened by UV radiation, oxidative stress, surfactants, and chemical treatments (bleaching, coloring, perming). The mechanism relies on enzymatic recognition of altered keratin domains and the formation of a protective biofilm that reduces protein loss while limiting further structural degradation. This action results in improved tensile strength, reduced cuticle erosion, and enhanced resistance to mechanical stress. In scalp and skin formulations, Kerazyme® Protect contributes to protein preservation and barrier stabilization, indirectly supporting hydration and inflammatory balance by maintaining corneocyte cohesion and reducing transepidermal water loss (TEWL) associated with protein breakdown.

In hair care systems, FSS Kerazyme® Protect functions as a bio-protective conditioning agent with particular relevance in anti-damage, anti-frizz, and color-protection formulations. By preserving keratin integrity, it helps maintain cuticle alignment, fiber elasticity, and surface smoothness, translating into measurable improvements in combability, shine, and breakage reduction. Unlike traditional conditioning polymers that only coat the fiber, this ingredient provides a biochemical mode of protection at the protein level, making it especially valuable in professional treatments and daily-use products designed for chemically stressed or thermally damaged hair. Its compatibility with surfactant systems and leave-on emulsions allows integration into shampoos, conditioners, masks, serums, and scalp care products aimed at long-term fiber resilience.