Testosterone (T) therapy offers the potential to improve a man’s energy, mood, and sex drive. Treatment comes in the form of injections, gels or patches placed on the skin, or tablets that stick to the gums. Candidates are usually men with a total T level below 300 nanograms per deciliter. However, the diagnosis of low T can be tricky, and doctors debate whether T therapy raises risk for blood clots, heart disease, and prostate cancer.
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