Why so much focus on "Google?" If it leads to published research, it's no different than accessing it via university databases, no? Yes, there is more than one c. Macroceras; would you be so kind as to tell us which you are using? I am in no way claiming that it does contain yohimbine alkaloids, just trying to explain to you that it's NOT some uneducated, out-in-left-field, random guess. All you told us is that you are using c. Macroceras extracted for alkaloids, and that it has a stimulant effect. There are multiple sources saying that c. macroceras contains yohimbine alkaloids, and yohimbine is one of the most popular, if polarizing, stimulant alkaloids out there. I fail to see how it is an unreasonable question/consideration/hypothesis/etc that it may contain yohimbine alkaloids. I completely respect you guys and your decision to keep things hush-hush, but you have to know that this will lead to people trying to figure things out on their own, no? Again, anyone claiming that Stim-X DOES contain yohimbine is making some assumptions and may be wrong, but suggesting/asking that it may have yohimbine alkaloids is hardly irresponsible/uneducated/etc. It's almost like you don't want people to try to educate themselves or do their own research; there's no reason to chastise people for doing so. Hell, people educating themselves and wanting to learn is one reason why the quality of supplements has improved in recent years.