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In addition, it plays an important role in sexual activity and disposition and, according to some research, it can even affect the feeling of self-confidence. Normal levels of total testosterone for adult men are considered to range from 300 nanograms per deciliter (ng/dl) of blood to 1,000 ng/dl. It is a very long-range, which suggests that it is difficult to specify what is a “normal level”: a “low” level for one person can be “high” for another – and vice versa.