Overall my experience with the product has been good, although I cannot say that I felt a strong effect in terms of alertness, energy or ability to focus vs. my baseline (i.e. I usually don't have an issue on this front). I took the shots on days I had to do concentrated work over sustained amounts of time. The product certainly did not detract from my capacity to execute and I do want to say that I felt a slight improvement (i.e. tighter focus/attention) but truthfully there might be a pla...Read more.