To clarify, hair is dead matter. Vitamin C (or ascorbic acid), vitamin A (the 'eye' vitamin is also a hair vitamin), vitamin B (all B-vitamins are helpful) and of course, vitamin D (found in milk and dairy. What's the com denominator between all these different appendages. The material that composes human hair is very com to the integument system of the human body.

The pre-conception that hairs are just tubular assemblages of dead cells made of protein has made some people complacent, or even careless. For something that has been on top of our head (and all around our body, actually), hair is one of the most ignored things in the human anatomy. Keratin is produced in the human body with the help of the most com micro-nutrients around, namely. By integuments, we refer to the human hair, the nails on the hands and on the feet and the small, down like hair that surrounds the human body. That would be the protein-like compound known as keratin.

Keratin is responsible for making our nails grow back, and is also responsible in continually reproducing our hair.