Got mine today took 2, 1 hour before cardio (3 mile fast walk) and 3 hours of martial arts class (sparing night).
I felt more alert during class , was like everthing was thru a 1x scope lol.
Noticed a little more sweat than normal nothing major. Thou i do seem to sweat doing anything besides sitting. Pulse and BP all normal.
Least i can actually tell i took it, unlike all the eca stacks i've tried.
Quess i'm highly resistant.