I remember the good old days of jack3d. Great supplement , but received a lot of criticism for its DMAA content. From a personal perspective, jack3d caused some health problems for me, primarily the inability to get a strong erection. I switched to a DMAA free product and the problem stopped immediately. Not saying that by any means my testimony serves as scientific evidence of DMAA's negative effects, and by no means does this prove that DMAA is the real villain, but the exoneration of DMAA as a suspect on the military deaths does not mean that it does not have negative effects. Personally, it seems that in my case DMAA was to blame for my problem. I think it's too soon to say that DMAA isn't at all dangerous. In my opinion, anything that screws with your Johnson must have some potentially harmful ingredient in it.