As men become older, their testosterone level reduces. If its level drops more than usual, they suffer from a number of symptoms. Typically, the testosterone level is considered to be low when it equals from 300 to 1000 ng/dL, according to the data of the United States Food and Drug Administration. The T level is defined with the help of a special blood test (serum T level).
There are 7 most important symptoms to signal about the issue.