Biotin, or vitamin B7, also known as vitamin H, is a water-soluble vitamin, which has many important functions in our body. br It is required in the metabolism of carbohydrates, fats, and proteins. br It is also important for proper hair and nail health. br Biotin helps maintain the proper function of neurons, and it regulates the immune function as well. br Deficiency of biotin is associated with skin problems, loss of hair, and brittle nails. br Therefore, taking enough biotin through diet is important to maintain a good health. br br 1. Egg yolksbr 2. Animal liverbr 3. Salmonbr 4. Nuts & seedsbr 5.