Bought this after trying the FitAid at my first Spartan Race. Really helped me recover from my race. It was my first and I was WIPED. But a few minutes after trying this I could feel myself being less fatigued. (still exhausted, but my body didn't feel as beaten up). And my mental clarity is what I really noticed. I was very tired mentally and unfocused as I finished the race. But even my girlfriend commented that I seemed very sharp on the ride home after all I'd just done. (It was the Killington Spartan,, known as one of the toughest).
I also work at night, so I sleep during the day, and fighting against my system isn't always a winning battle. But if I wake up a little foggy or unfocused. A cold Fitaid on my ride to work is enough to shake the cobwebs out and get me focused for my next 8hrs.. All in all. Its amazing stuff. And I was very shocked with the results!