I bought two boxes of it on discount. I went through first box and never really felt anything other than nausea, no intense pump, no energy, just made me feel sick. I thought what a waste. Then I decided to go through the second box and it is amazing. I don't want my workouts to end, I get instant pumps, I feel like a madman in the gym. The difference between boxes and or batches are like night and day. Now remember these are individual packets so I'm not taking more than I did before. Something about this batch is a hell of a lot better. It seems the first box was a big waste compared to this one.