I have been doing PowerBar Endurance for the last 3 years. Seems to work well for me. If anyone is having stomach issues with Cytomax you may want to try PowerBar. I also use PowerBar gels, Cliff Shots, Cliff Bars, and Odowalla Bars. For variety I carry some Costco Dog Biscuits. Not to eat but to feed some dogs that hang out near one of my rest stops. They use to bark at me now were are all friends.