Iron: A Cosmetic Constituent But An Essential Nutrient For Healthy Skin

The 2001 review examined iron's dual role as a cosmetic constituent and an essential nutrient for skin, hair, and nails. It found that iron was crucial for oxygen transport and cellular functions, with deficiencies leading to hair loss, nail deformities, and impaired wound healing. While iron absorption from cosmetics was minimal, dietary iron was essential, with different absorption rates for men and women. Iron levels affected hair color and growth, with deficiencies causing hair loss and texture changes, while excess iron could be harmful, as in haematochromatosis. The review called for more research into iron's physiological roles and its impact on skin and hair health, noting that iron toxicity in skin was rare and the effects of cosmetic iron were unclear.