Vitamin B₁₂,- Is also known as Cobalamin, and it is one of the eight B vitamins that helps keep the body's nerve and blood cells healthy. 

Vitamin B12 promotes healthy hair growth by assisting in the production of oxygen-rich red blood cells, which in turn feed hair follicles. Hair is made of a protein called keratin and since it helps produce red blood cells, having enough of this vitamin is essential to hair growth process.

Other benefits: It helps in the formation of DNA, the genetic material in all human cells. Vitamin B12 also helps prevent a type of anaemia called megaloblastic anaemia that makes people tired and weak.