well, i can tell you that it i have seen it at whole foods in massachusetts so you should look there... it's sold in an extract, where the vitamins are. if you're actually looking for the bark i'd assume that would be easiest to get online and have it delivered. can't tell you much about effects other than it's often used as an aphrodisiac. http://www.erowid.org/plants/yohimbe/yohimbe.shtml <- check out that page if you haven't already.
Maybe works a little, maybe placebo. All in all not worthy it, though the tea I made was actually quite pleasant tasting.
Actually I remember buying the Yohimbe vitamins at a health food store and for the most part it didn't even work.
