Energy for Someone with IBS

My gf has a irritable bowel syndrome and most energy drinks or pills really mess with her stomach, including Spike. We have discovered some of the main ingredients that do mess with the stomach such as yerba mate and large amounts of caffeine or sugars. Would y’all have any recommendations on what she will be able to use?

Food and sleep provide excellent sources of energy.

Alpha-GPC or DMAE, B Vitamins (Power Drive is good and should be fine for IBS)
Adaptogens like Rhodiola