When I recieved the product, it was half empty and I wish these companies can fill the jugs to the top with their product. First time I tried it I really noticed the effects. I couldn't wait to get to the gym (energy), I knew what I wanted to do and how I was going to do it (focus) and I was a bit jittery while headed to the gym (first time user side effect. After the first time, I hardly felt the superpump there and I had increased the doseage from one scoop to 2. Perhaps my body already got used to it. This is my first and last jug.