If pre workouts wreck your stomach, the problem probably isn't you — it's the ingredient list. Artificial sweeteners, fillers, maltodextrin, and mega-dose caffeine are responsible for most pre workout GI distress, and they're in almost every product on the market. PurePump takes a radically different approach: 15 active ingredients in 7.7g, with zero artificial sweeteners, zero fillers, zero flavoring compounds. Every gram is active ingredient. For people whose stomachs have vetoed every pre workout they've tried, that distinction changes everything.