Biotin, also known as vitamin B7, is primarily used in the production of nutritional supplements to support skin, hair, and nail health. It is also incorporated into hair care and skincare products such as shampoos, conditioning creams, and serums to strengthen hair and reduce hair loss. Biotin plays a key role in the body's metabolic processes by assisting enzymes involved in the metabolism of proteins, fats, and carbohydrates, making it popular in supplements for promoting overall health.