What is the active ingredient in this "stimulant?" It is an easily defensible argument that this is a medical question rather than a chemistry one, however, I feel that it leans ever so slightly towards chemistry, and so I posted it here.

There is a "new" OTC stimulant being pushed around that shall remain unnamed so that this isn't flagged as an advertisement or anything.  In looking at the list of ingredients, I don't see anything that would act as a stimulant anywhere in that list.  Having said that, I'm not an expert.

So, I came to the experts.  ;)

Here are the ingredients according to the bottle:



Just to clarify, the heart of this question is "Which ingredient is the stimulant?"
If you google Schizandrol A ( 1,2,3,10,11,12-hexamethoxy-6,7-dimethyl-5,6,7,8-tetrahydrodibenzo[a,c]cycloocten-6-ol, here's a link to a picture of the structure) you find that it is an herb capable of curing just about anything.  If you poke around a little deeper, you find two repetitive themes 1) it increases focus and 2) synergistically enhances the effect of other chemicals ingested along with it.  You also note this herb has caught the attention of the bodybuilding community.  The lifters use terms like "pump and rush", "being on another planet", etc.  Apparently it can take focus to a whole new level. From what I read it looks like it's always ingested with other stuff so it's hard to separate out what's what.  My guess is that all the ingredients in the bottle come into play and the effect they have together, particularly with the Schizandrol A present, is much greater than any ingredient alone.