It is widely used in metabolic processes related to fats, carbohydrates, and amino acids, helping your body convert food into energy. The vitamin ingredient BIOTIN improves the quality of the keratin structure and therefore has a positive effect on fine and brittle hair and nails, and has also shown synergies in skin care applications where it can reduce age spots and even out skin tone. Healthy hair, skin and nails - Having beautiful hair, skin and nails is really about what you put on your body, not just about it. Our biotin helps address any internal vitamin deficiencies and helps you have shinier skin, stronger nails and the longer, thicker, fuller hair you desire.