Where Testosterone Comes From and Why It Falls: Primary vs Secondary Causes, the 300 ng/dL Threshold - and No, Soy Doesn't Lower It

Testosterone is made in a chain of command that runs from the brain to the testes, and knowing where in that chain a problem sits is the difference between a treatable cause and a lifetime prescription. When a man's testosterone is low, the single most useful question is not 'how low?' but 'why?' - because the answer separates a failing testis from a brain that has stopped sending the signal, and the second group is full of reversible causes sitting in plain sight. Along the way, it is worth dispatching the most persistent diet myth in this area, because the meta-analysis is unusually clear.

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