Why do you ask?: At age 25, most men have all the testosterone they need and more won't change things. If you are truly deficient, your physician can document this and replace it, "vitamin" scams won't help. Your body hair / beard are genetic. If you are having weak erections even with people / images that turn you on, your physician must rule out prolactinoma, hemochromatosis, other entities. Stay proactive.
Answered 12/30/2013
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