Problem at 18?: It is unusual for a 18 yr old who has been having regular/normal erection and now has trouble. But , anything can happen. If you suddenly had pituitary failure or testicular failure which can cause your trouble, but you likely have other symptoms as well. I suspect some psychological cause for your trouble. There are supplements, but i advise consulting doc to find out why first. Good luck.
Answered 12/9/2013
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