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Hair is an outgrowth of the epidermis in mammals. Hair is a characteristic of all mammals, though in some species hair is absent at certain stages of life.

The cuticle is responsible for much of the mechanical strength of the hair fibre. It consists of scale-shaped layers. Human hair typically has 6-8 layers of cuticle. Wool has only one, and other animal hair may have many more layers. Hair responds to its environment, and to its mechanical and chemical history. For example, hair which is wetted, styled and then dried, acquires a temporary 'set', which can hold it in style. This style is lost when the hair gets wet again. For more permanent styling, chemical treatments (perms) break and re-form the disulphide links within the hair structure.

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.

  • Renu Herbs
    Specializing in detoxification and colon cleansing, natural weight loss, hair growth, and other formulas for better health.
  • Evaluation Of Excessive Hair Growth : Hirsutism
    Frederick R. Jelovsek MD: Evaluation of excessive hair growth and androgen testosterone excess.
  • NuGen Hair Growth System
    Natural hair regrowth systems for men and women.
  • Herbal Care New Zealand
    Organic products for weight loss, hair growth, and to stop smoking.
  • ThymusKing
    Offering ThymuSkin products for stimulating the growth of new hair. Includes information on hair loss and directions for use.