Biotin is a water-soluble B-vitamin (B7) essential for carbohydrate, fat, and protein metabolism, and for healthy hair, skin, and nails. In nutrition, it functions as a coenzyme for carboxylase enzymes, aiding in energy production and fatty acid synthesis. It occurs in foods like eggs, nuts, and certain vegetables, and deficiencies are rare but notable in prolonged malnutrition or certain genetic conditions.
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