Sep 29, 2010 5:44 PM GMT
I heard about this product called jack3d by USPLAB(pre-workout supplement) I went and bought a jar, tried it this morning before my work out. I literally did 3 sets of lat pull downs and felt like I couldn't breath, my heart beated like it was about to jump out of my chest. Needless to say I left the gym and went home. So has anyone ever use this product? If so what was your reaction to it? Btw my blood pressure is naturally low(genetics) like around 100/70 ish. I'm returning this product to GNC tomorrow.