Biotin is a water-soluble B-vitamin, also known as vitamin B7 or vitamin H. It plays a crucial role in the metabolism of carbohydrates, fats, and proteins, helping the body convert food into energy. Biotin is essential for maintaining healthy skin, hair, and nails, and it is often included in dietary supplements aimed at promoting hair growth and overall beauty. This vitamin is naturally found in various foods, including eggs, nuts, seeds, and certain vegetables like spinach and sweet potatoes. While biotin deficiency is rare, it can lead to symptoms such as hair loss, skin rashes, and neurological issues. Most people obtain sufficient biotin through a balanced diet.