Ucan has saved my training!
Ucan gel has worked well for me on my long trail runs. I had a DNF last October in a 50k as a result of crashing on sugar and caffeine. A friend recommended Ucan and I love it. I didn't think it was possible to have energy without loading up on caffeine. Never again. Ucan is it. It is a little pricey for my budget, but I just wait for the discounts and codes when I order.