Biotin 300mcg Code 1260 (300mcg / 90 Vegetarian Tablets) Biotin is involved in the metabolism of protein, fats and carbohydrates. Biotin promotes strong nails, healthy hair and may help seborrheic dermatitis. One clinical study showed that 2.5 mg of biotin per day strengthened the fingernails of two-thirds of persons with brittle nails. Although it seems to help with cradle cap in infants, the whole B complex is of more value in adult seborrheic dermatitis than biotin alone. Biotin is reputed to help baldness. Biotin is also produced by intestinal bacteria, so a biotin deficiency is rare. However, persons using antibiotics long-term or who eat large amounts of raw egg whites can develop a deficiency, because the protein in raw egg whites inhibits biotin absorption.