It's not Paleo/Primal, but UCAN Superstarch is a relatively new producted that is promoted by low carb/fat adapted endurance athletes. It promotes the use of fat for fuel by not spiking insulin. Other products like Hammer and GU are pure sugar. Superstarch is a slow burn fuel. Some athletes even report using it and not coming out of ketosis during the process. I'm in the process of becoming fat adapted now. Once that happens, I'm going to use Superstarch as fuel during longer races.