Hair growth formulas
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Structurally, hair consists of an inner cortex, comprising spindle-shaped cells, and an outer sheath, called the cuticle. Within each cortical cell are many fibrils, running parallel to the fibre axis, and between the fibrils is a softer material called the matrix. It grows from a hair follicle.
The diameter of a human hair ranges from about 18 µm to 180 µm. In people of European descent, blond hair and black hair are at the thinner end of the scale, while red hair is the thickest. The hair of people of African descent is typically thicker than the hair of other groups.
Hair is a biological polymer; over 90% of its dry weight is made up of proteins called keratins. Under normal conditions, human hair contains around 10% water, which modifies its mechanical properties considerably. Hair proteins are held together by disulfide bonds, from the amino acid cysteine. These links are very robust; for example, virtually intact hair has been recovered from ancient Egyptian tombs. Different parts of the hair have different cysteine levels, leading to harder or softer material.
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- Unbalding: Hair Today, More Tomorrow?
by Susan L. Narod. Hair growth products overview, causes of hair loss, hair transplant surgery. - California Pacific Research, Inc.
New Generation hair care systems to promote healthy hair growth without drugs and potential side effects. - 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. - Hair Growth Rate
Why is the hair on your arms short, but the hair on your head long?