Your hair grows. Then it doesn't. Rarely for one reason, and rarely overnight. But there's a pattern to when people notice — after a birth, after an illness, after a long stretch of eating less than the body wanted. Periods when demand rose and supply didn't. Biotin is vitamin B7, one of the cofactors your body uses to build keratin, the structural protein in hair and nail. Your body stores very little of it, which is why steady daily intake matters more here than it does for the vitamins you can bank. How much? Research on hair and skin maintenance sits well above the 50μg EU reference intake, which is why each tablet here delivers 5,000μg. Biotin contributes to the maintenance of normal hair, normal skin, and normal energy-yielding metabolism.* One small tablet with breakfast. Ninety tablets — three months, which is roughly how long hair takes to tell you anything. Vegan, allergen-free. Bottle or refill pouch. *EFSA-authorised health claims for biotin.