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The speed of growth is roughly 10 cm/yr = 0.3 mm/day = 3 nm/s. The cells at the base of the hair follicle divide and grow extremely rapidly. This is why people under chemotherapy sometimes lose their hair; the treatment targets any rapidly-dividing cell, not just the cancerous ones.

On most adult humans there are two main types of hair: terminal hair, and vellus hair. A third type, lanugo hair, is present in the fetus, and some newborn babies.

Sometimes, the term body hair is used, to distinguish hair on the body from hair on the head. The difference between body hair and scalp hair (and, in males, chin and moustache hair) is that head hair for practical purposes grows continuously, whereas body hair alternates regular periods of growth and dormancy. During the growth portion of the cycle, body hair follicles are long and bulbous, and the hair advances outward at about a third of a millimeter per day. After a few weeks, body hair growth stops. The follicle shrinks and the root of the hair rigidifies. Following a period of dormancy, another growth cycle starts, and eventually a new hair pushes the old one out of the follicle from beneath. Head hair, by comparison, grows to great length, whereas body hair does not. Anthropologists speculate that the functional significance of long head hair is almost certainly adornment, a by-product of natural selection.

  • Regaine Solutions
    Explains the process of hair growth and hereditary hair loss and offers a minoxidil based hair loss treatment for both men and women.
  • Herbal Care New Zealand
    Organic products for weight loss, hair growth, and to stop smoking.
  • Unbalding: Hair Today, More Tomorrow?
    by Susan L. Narod. Hair growth products overview, causes of hair loss, hair transplant surgery.
  • Rogaine.com
    Questions and answers about minoxidil hair growth solution. Pharmacia and Upjohn the manufacturers of Rogaine own this web site.
  • Physicians Hair Growth
    Hair loss treatment center that supplies ReMox, a combination of minoxidil and tretinoin.