Function: Metabolism of fats, proteins, and carbohydrates; nail and hair growth
Sources: Gut bacterial synthesis, organ meats, cheese, soybeans, eggs, mushrooms, whole wheat, peanuts
Optimal Intake: 300 micrograms (mcg)
Deficiency Signs: Seborrheic dermatitis (cradle cap) and hair loss in infants; brittle nails and hair
Toxicity: None reported