This product is great when stacked with a powdered pre-workout product such as MRI's Black Powder. The product alone will give you a nice pump regardless also it depends on how vascular you are. You must drink at least a gallon of water a day spaced out a 16 hour period. I liked the stuff when i used it and i still like it. I do not use it anymore though as i have found a much superior product. It is too pricey though for someone of a larger size. In addition to that it does not have that much arginine in it. If they added citrulline it would be a 10 because you would have massive pumps with the ingredients in liquid form.