Hair grows everywhere on the human skin except on the palms of our hands and the soles of our feet. The hair you can see is actually a string of dead keratin (a protein) cells. The average adult head has about 100,000 to 150,000 hairs and loses up to 100 of them a day. Hair grows in follicular units meaning groups of 1-4 hairs, majority of which have 2 hairs. In hair transplant a graft is an extracted follicular unit consisting of a group of hairs. At any one time, about 90% of the hair on a person’s scalp is growing. Each follicle has its own life cycle which is divided into three phases.