I used it when Duchaine 1st promoted it as DNP -ight with his HPDx supplement. It made me feel REALLY aweful. Now, I have no problem with feeling aweful, IF, the end results are worth it. However, the end results were sub par. If you're going to use an uncoupler, go for DNP. I felt better on it, & the results were 100000x better. DNP, at sane dosages, is the best fat burner in the history of mankind.