Inability to achieve or maintain an erection can have both psychological and biological causes.  A man who has spontaneous erections during sleep but is unable to have them when awake has an entirely psychological cause for his problem.  If he is unable to have erections during sleep, then the cause is biological – and nutrition may be able to help, by providing support to the prostate gland and by taking an arterial cleansing formula to restore blood flow to the male organs.

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