It seems the formula sold by donnie darko (proteabody) is similar to the Yohimbine product I use from another store. I have had good results with their product so I would venture to say his would work as well.
On another note... they are not useful (or AS useful) if you have mid-high bf... They are really designed for "stubborn" fat in conjunction with diet and cardio... I only use mine before my AM cardio sessions or PM lifting (in the PM I use directly before lifting, my pre workout meal is 1hr before, it should be used on an empty stomach or as empty as possible)