Keratin is a fibrous protein and the primary building block of tough, protective outer layers in many animals. It forms the core structure of hair, nails, feathers, and the outer layer of skin, providing strength and resilience.
Keratin is a fibrous protein and the primary building block of tough, protective outer layers in many animals. It forms the core structure of hair, nails, feathers, and the outer layer of skin, providing strength and resilience.