According to scientists, there are three causes of alopecia in either men or women. Alopecia causes low self esteem in some people and understanding hair loss reasons is the first step in treating hair loss.

Too much DHT
Pseudo-oestrogen chemicals
Insufficient essential nutrients

DHT
Free testosterone is broken down into DHT (a more powerful form of testosterone). This chemical binds to the hair follicle receptors blocking important nutrients from accessing the hair. The hair becomes miniaturized and feeble and eventually dies. It is what's called the "peach fuzz" look on young men with hair loss.

This is why eunuchs never had any alopecia which made Plato wonder. It is also why only men get male pattern baldness and women don't. Hair loss in women is more evenly distributed with general thinning of hair all over. Also, effective DHT inhibiting treatment was only effective for young men with hair loss and not older men or women. Excessive DHT is after all not the only reason for losing your hair.

PSEUDO-OESTROGEN CHEMICALS
It is commonly inconceivable for women in China to get hair loss at any age. Over the last 20 years a larger number of Chinese women in the industrialized areas of China are experiencing hair loss. This has been put down to chemicals from the industrial process which mimic the chemical effects of oestrogen. These pseudo-oestrogen chemicals bind tighter to the hair follicle receptors than proper oestrogen does, starving the hair follicle of vital nutrients, similar to the way DHT does.

Also, this seems to be the reason for hair loss in obese men. Fat cells in obese and balding men contain extra of the enzyme aromatase (responsible for converting testosterone into oestrogen). Also bacteria in fat cells produce oestrogen-like chemicals.

INSUFFICIENT OF VITAL NUTRIENTS
The hair needs a variety of nutrients to stay alive. The theory is that both DHT and estrogen-like chemicals block the hair follicle by binding to it too tightly. Even without these chemicals, a person lacking in these nutrients will experience hair loss.

There have been experiments on mice which show the effect of a deficiency of specific vitamins or minerals. Scientists knocked out the genes in mice responsible for the regulation of the hair and scalp. These genes are in turn generally regulated by vitamin D. The result was rickets and hair loss with dermal cysts appearing quite early on. When scientists injected naturally "nude" mice with vitamin D, they started sprouting hair at a disquieting rate.

It has been demonstrated that copper and zinc, if lacking together, increase the loss of hair. In fact, a copper peptide was shown to bring about hair growth in the skin around the wound of a person. Copper peptide was first used as healing accelerant.

For women, a lack of iron and the essential amino acid L-lysine has been associated with hair loss. This therapy has proven to be very beneficial for women experiencing hair loss.

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