Low testosterone has been hyped a lot in the media recently. It is a real cause of erectile dysfunction and responds well to supplementation, but not all erectile problems are testosterone-related. "Having low testosterone can be associated with having a problem with erections, but you can certainly have a normal testosterone and still have problems with erections," says Breyer. Signs your testosterone may be low include decreases in body hair growth, decrease in muscle mass, lower sex drive, and fatigue.
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