Here is my opinion on this.
First, there is no way to really know for sure the interaction between
yohimbine and ephedrine when humans take it, as there are so many arguments both ways. The only thing that is known for sure is that they additively increase stress on the cardiovascular system.
Second, you definitely can't take the ingredients in most popular products as indications of what works, as they put what people think works in the products, not what is actually known to work.
Third - and I know this is an opinion many disagree with - I don't put much stock at all in reports of results from people (unless we are talking about steroids/
prohormones). There are so many different factors, that it is difficult to ever isolate the fat burner you are taking as the sole cause of fat loss. People often give positive feedback based on their perception of what a fat burner should be like - I've noticed that if something makes the person feel wired, they will think it is a potent fat burner, even if it's not. This is why many companies hide large amounts of
caffeine in their products, even though
caffeine is not a very effective fat burner by itself. They know that people will "feel it working." And, with ephedrine and
yohimbine, you will definitely "feel it." But this isn't necessarily indicative of positive results.
Personally, I recommend against combining the two, for safety reasons - ephedrine (with
caffeine) is very effective, and the effectiveness will increase pretty much linearly up until about 100-150 mg, so if you aren't taking that much, then just increasing the dosage will increase your results. It is best to keep it simple, and that way you can guage exactly how you are reacting to the compound, without having to guess which one is causing a certain effect.
