Collagen and biotin are popular supplements for healthy hair ... Biotin is not known to cause side effects in most people, ...

is a water-soluble vitamin that is crucial for a variety of processes in your body. For example, vitamin C plays a crucial role in the production of the protein collagen. "Collagen is for more ...

is that it protects against collagen crosslinking, and stops the oxidation of lipids linked to both aging and the skin. Vitamin E is a fat-soluble vitamin —similar to vitamin D and K — that's ...