Theanine + caffeine is legit for preworkout

All the preworkouts ive taken have destroyed my stomach. I'll be burping and getting acid reflux during my workouts. I mean, why TF would they put vitamin C and all those B vitamins in preworkout? It's like the worst sh!t ever for a preworkout.

Theanine + caffeine is legit. You get energy without the extreme jitters and no stomach issues.