I dig this stuff! I received this as a free sample for product testing. This is my honest opinion of the product. I have been using this for 2 full weeks of workouts and it has really helped me. I get better pumps during the workouts, my muscles are definitely fuller, and my strength has increased. I had taken about a month off of training while traveling and this really helped get me back on track. I am using this along with a stack from Muscle Tech for weight training workouts and my results have been better than without supplements for sure! I’ve had no stomach trouble with this at all, which is a huge plus for me. I tend to have bad stomach reactions from supplements and I've experienced none from any of the MuscleTech Pro Series products. MuscleTech keeps improving their product line and I'm experiencing the payoff from their hard work!