Every man over forty should be on testosterone

Levels drift down slowly, and partly with weight and health, and only a minority of men meet the diagnosis of symptoms plus repeated low tests. In trials the benefits are modest and mostly sexual: more desire and activity, a little more energy, corrected anemia. The costs are real: switched-off sperm production, thicker blood, higher blood pressure, irregular heartbeat, clots in the lungs and more fractures. The US label still limits its use for age-related decline, and the Endocrine Society has warned against treating normal aging as disease.24 Test properly, fix weight first, and treat a confirmed deficiency with a clinician who will monitor you.