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At 26 you should not need to take vitamins or modify your diet to get hard. When I was your age I lived mostly on rice and veggies with meat being an occassional treat, took no vitamins, and only exercise I got was walking several miles a day -- and yet I was so horny I had to masturbate at least 5x a week to not go crazy and start humping trees.
There's got to be something medically wrong with you, OP, so stop wasting your time on 4chan and make an appointment with an MD.