Low testosterone (low T) affects 4 to 5 million men in the US. Testosterone is an important hormone in the human body. But it starts to decrease each year after age 30Trusted Source.
In some men this can be substantial. Between 19 and 39 percent of older menTrusted Source may have low levels of testosterone. Older men with low T have increasingly sought testosterone replacement therapy (TRT) in recent years. TRT addresses symptoms such as low libido, poor muscle mass, and low energy.
It’s not just older men that are affected by low T. Young men, even babies and children, can also have this problem.
