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Is this global or scattered hair thinning?
Hair loss can be due to genetical or environmental factors. The most common cause is due to genetic causes. Other causes are vitamin and iron deficiencies, and therefore, it is a good idea to see your GP for routine blood tests.
You can increase iron in your diet, change your shampoo and exercise more.You can also try minoxidil which works for hair loss in men.
Minoxidil (Rogaine) is a good medication that can help reduce hair loss.
You have to try a few different ones and see which one is best for you in terms of hair loss.
Nothing specific but the less chemicals they contain the better it is
More natural shampoos are generally better
Yes some forms of minoxidil are non prescription and can be bought over the counter.
I suggest you leave it as it is, and do not use a lot of chemicals
It depends on the cause and various factors but generally it can take months