D-Biotin, also known as vitamin H or B7, is a water-soluble vitamin that plays a crucial role in the metabolism of carbohydrates, fats, and proteins. It is essential for maintaining healthy skin, hair, and nails, and is often included in dietary supplements aimed at promoting hair growth and overall skin health. This vitamin is naturally found in various foods, including eggs, nuts, seeds, and certain vegetables like spinach and broccoli. A deficiency in D-Biotin can lead to symptoms such as hair loss, skin rashes, and neurological issues, making it important for overall well-being.