Iron: a cosmetic constituent but an essential nutrient for healthy skin

Iron compounds have an established role as colorants in many cosmetic products applied to the skin, hair and nails. Evidence is reviewed showing that in addition to its importance as an essential nutrient necessary for oxygen metabolism and mitrochondrial function, iron exhibits a fundamental importance as a trace metal in the normal growth and functional maturation of the skin and in the health of hair and nails. The implications of iron from cosmetic sources in the nutrition of human skin is discussed.