I stacked it with their MEP product prior to starting my current cycle, gains in strength and mass were like nothing I had ever seen from something you could by legally, but no side effects. Zoelabs is not far from me here so I checked them out and if you are not satisfied, or you dont gain what they claim you will, you can get your money refunded, no questions asked. He says it is great to stack with gear, but I am saving mine for off cycle time.