Keratin is a compound consisting of a mixture of amino acids and peptides. Low molecular mass of keratin compounds facilitates its penetration into deep layers of the hair and skin. Moreover, part of the consumed keratin which has low molecular weight penetrates into deep layers of the skin and facilitates improvement and repair of the skin and hair. On the other hand, the larger molecules that cannot penetrate into the skin and hair, act as a resistant cover and shining agent. Usage: Keratin is used as an effective agent in the formulation of many cosmetic products such as various shampoos, conditioners, nail products such as nail polish, hair color, oxidants, etc.