Wow! This stuff jacks my energy level through the roof ! One scoop mixed with water is all it takes. I ride to the gym and by the time I get there, I am an animal unleashed. I have read mixed reviews on No2 upregulating products and side effects, but I have experienced none other than the time i took 2 scoops and had heart palpitations. You have to drink at least 2 quarts of water a day when you use this. I go to the bathroom alot. This stuff will turn you into a snarling, sweating beast. Look out!!!