Hydrolyzed Keratin

Hydrolyzed keratin is keratin — the structural protein that forms the outer layer of skin — that has been chemically broken down into smaller fragments. This process, called hydrolysis, makes the protein smaller and more able to penetrate or coat the skin surface. Keratin is extracted from various sources, including animal by-products such as feathers and wool.In skincare, hydrolyzed keratin functions primarily as a humectant and skin conditioner. It draws moisture into the skin and forms a lightweight film on the surface, helping to improve texture and smoothness.

Hydrolyzed keratin works through two main mechanisms. First, as a humectant, its molecular structure is hygroscopic — it naturally attracts and holds water molecules from the environment and deeper skin layers, drawing them toward the surface. Second, it forms a thin protective film on the skin, which helps seal in moisture and provides a smoother appearance.Because the keratin has been hydrolyzed (broken into smaller chains), it is more easily incorporated into formulations and less likely to feel sticky or heavy than intact keratin.

Hydrolyzed keratin is typically found in leave-on products such as moisturisers, serums, and hair conditioners rather than rinse-off formats. Apply to clean, damp skin for optimal hydration — the moisture on the skin helps the humectant function more effectively. It pairs well with occlusive ingredients (such as oils or silicones) layered on top, which help seal in the hydration it draws in.

Hydrolyzed keratin is generally well-tolerated and considered safe for topical use. Those with sensitivity to protein-derived ingredients or specific allergies to the source material (such as feathers) should patch-test first.