Josh, Gu is okay if you're more than a couple of hours into a workout, and you're burning through the glucose quickly, otherwise it causes the "spike / fall" response because it's a shorter chain glucose than Hammer Gel. FWIW, three of the four competitors at the 48 hour mountain bike race I won last weekend went with liquid nutrition. One used
Infinit nutrition where you custom design your own blend, which I'm going to try this winter in training.
BTW-If it's really hot, I add Hammer Nutrition's endurolyte powder straight to my bottles and use
Elete straiht to mitigate cramping.
Espi- both Sustained Energy and Perpetuem, which I use interchangeably, have protein in them. Recoverite (Subtle citrus mixed with lemonade crystal light-yummm) has glutamine in it.