Puhdas+ Collagen & Biotin contains fish collagen, a protein isolated from fish. Collagen makes up 30% of the protein in the human body and is found especially in the skin. At about the age of 25, the body begins to lose its ability to produce new collagen. The biotin in the product helps keep skin, hair and mucous membranes normal. Zinc also helps keep skin and nails normal. Vitamin C promotes the normal formation of collagen for the normal functioning of the skin.