Chemistry
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Hair begins to grow in the womb from around the 6th month.
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Hair evolved as a means of protecting the head.
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Vitamins A,B-2,B-6, amino acids ,iron and copper etc. are good for
the hair.
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Hair growth is affected by the autonomous nerve system and hormonal balance.
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The human head has from 100,000 to 150,000 hairs.
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The average life span of a strand of hair is 5 to 6 years.
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From 50 to 60 strands of hair are replaced everyday.
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A strand of hair grows at a rate of about one half inch a month.
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The thickness of a strand of hair is from 2/100 inch to 6/100 inch.
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Hair contains 80~90% of proteins(keratin) of its whole atom.
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A strand of hair is composed of three different parts
with functions analogous to bone, flesh and skin of the human body.
