yohimbe is an interesting thing, I have only consumed it once, in combination with some bud. What we did was extract the herb in alcohol, then let the alcohol dry so that the alkaloids were in crystal form, them put them into some sake. So we went out to the woods and sipped yohimbe-sake(chasing it w/ redbull) and smoked some chronic, it was nice. I would suggest getting some from a herb store, its pretty cheap, and experimenting. Be careful though, don't consume in combination with alcohol(the sake was very low in alcohol and we only had small amounts), and read up on its chemical effects(I can't remember if its an MAOI, i think it is...).