Collagen, a protein produced by your body, has been proven to be one of the most important substances for having a healthy set of hair. This protein can be used as a source for amino acids crucial for creating keratin, the protein base of the hair. It’s also a very powerful antioxidant that would protect your hair follicles against free radicals’ exposure. Collagen can also prevent hair loss caused by aging, which is a result of the weakened dermis. In addition to the previous advantages, the antioxidant feature of collagen can also slow down the graying of hair.