I’m a 50 year old ultra running competing in 100 mile and 50 mile races. Like everyone else doing these types of runs in extreme conditions I experienced GI problems using a verity of products until I tried Cank. It was easy to get down and I could feel an immediate boost with minutes. Soon it became my fuel of choice ( in 50 mile runs I consume as many as 10-15 packets and in 100 milers as many as 20-25). It has never hurt my stomach and I’m usually able to stay on top of my energy level through out an event. Since using Crank e-Gels I have completed two Wasatch 100 mile runs, two Leadville 100 mile runs and the Tahoe Rim Trail 100 run and will be using using Cank in volume at Western States 100 and the Tour Du Mont Blanc in Chamonix, France. Thanks for great product!