Like the skin and nails, hair is chemically a protein material and there are on average 120,000 hair producing follicles on our scalp. The normal hair growth rate is 1 to 1.5 cms (1/2 to 3/4 inches) monthly, and is slightly faster in women.
Hair has three main physical layers; the outer cuticle; the cortex, comprising the bulk of the whole structure; and a middle core, the medulla.
