Ya, it didn't do much for me so the search continues, I'm happy with cydodyne which gives me a great workout. I don't even feel it while I'm taking it, but I'm able to push my self harder and my endurance is better also. When I say I don't feel it, it is almost similar to like protein that kind of feeling where you take it and it's not like a physical senergistic type thing, but you know it's working.