An exotic ingredient promoted as being necessary and beneficial for skin and hair care. A deficiency of this vitamin has been associated with greasy scalps and baldness in rats and other experimental animals. Fur-bearing animals, however, have a very different hair growth from human beings. Biotin deficiency in man is extremely rare. The molecular size of Biotin is too large to penetrate the skin.
Some companies imply that collagen can support the skin's own collagen network.
Others claim it can be absorbed to moisturize skin. Another ingredient promoted as being beneficial for skin and hair care. Elastin is included in some skin care products, but nowhere near as much as collagen. In a cosmetic product, they cannot restore tone to skin. If it smells natural, it must be good for you.