As men age, their testosterone levels naturally start waning—in fact, it has been estimated that nearly 40 percent of men aged 45 and older have clinically low levels of testosterone, or androgen deficiency. Low testosterone levels are responsible for everything from the loss of sexual desire, weaker erections, increased belly fat, and breast enlargement to low muscle mass, low energy, irritability, and depression—all symptoms that no man wants to deal with.
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