Before my workouts i feel like i need a kick, for the energy and the drive. Ive used pretty much all the different kinds of pre-workout supplements like NO explode, Black Powder, SuperPump etc. But even though the drive was good off those they did seem to upset my stomach alot after the workout or even in the middle of giving me acid reflux or heartburn. Ive switched to RedBull Non sugar and have been drinking those for quite some time before my workouts but i feel that it isnt the healthiest way (3-4 redbulls a week). What are some other things i could use instead and that would be better for me too ?