The bark of the Yohimbe plant can be extracted for a compound called Yohimbine, which is a fat burning neuro-stimulant. It has blood flow increasing properties and targets stubborn body fat. It can even be used topically to treat tough areas. Yohimbine has only one serious downside; it can cause severe anxiety in some people even at very low doses. Hell, even for me the 6% extract makes me break out in cold sweats and extremely anxious. Oddly, the straight Yohimbine extracts (98%) does not have this effect. Even though people freak out with Yohimbe from time to time, it has been shown to be very safe. It was even tested as high as 30mg per day on men to treat erectile dysfunction, so the 3-5mg in diet products are certainly safe. It is great stuff when stacked with other stimulants because it works in other pathways besides the traditional routes. Yohimbine can also be used topically to burn fat in certain areas of the body. It is well studied as an injectable or topical for that purpose and has a very good track record.