Hey I take 5-HTP too! But anyways, I heard about the vitamin c thing, so I drank 2 big glasses of OJ whilst high one day, and I dunno if it was just good bud, or I was in a good mood, but I thought it amplified the high a bit. I was smoking on trainwreck, and it seemed to boost the sativa high. Needless to say, I've been drinking more OJ lately, haha.