Gu roctane energy gel roctane takes the athletes top choice for an energy gel gu amplifies the original recipe and then adds new ingredients to boost performance in sustained high intensity efforts they start with original gus superior mix of complex and simple carbohydrates that provide quick and sustained energy electrolytes for replenishment and caffeine to tap more power and diminish pain from there we increase the amount of histidine an essential amino acid to act as a buffer and