Collagen is a type of protein found extensively throughout the body. It supports skin, internal organs, muscles, bone, and cartilage. There are more than 25 types of collagen that occur naturally in the body. Collagen works in tandem with elastin to give skin its texture, structure, and appearance. Sun damage (extrinsic aging) and aging (intrinsic aging) causes collagen in the skin to deteriorate. As a cosmetic ingredient, collagen is derived from animal sources, but plant derivatives that act like collagen (pseudo-collagen) are also used. In any form, collagen is a good water-binding agent. Collagen in cosmetics, regardless of the source, has never been shown to have a direct effect on producing or building collagen in skin.