Just wanted to get a lil input from everyone else on this product. I've used it for 3 days now, day 1 starting with 1 scoop with 5 oz of water. 2nd day 2 scoops with 10 oz water, 3rd day 3 scoops with 14 oz water. I haven't felt anything at all from this stuff. Should I try 4 scoops or is this stuff garbage?? Anyone have any info at all? I have noticed my heart beats fast while in the gym and I do take it on an empty stomach.