If your idea of training and racing is giving it your all in a multi-hour adventure (think Ironmans, marathons, centuries), then GU's Roctane is for you. It starts with original GU's mix of complex and simple carbs for quick and sustained energy, and electrolytes for replenishment. From there, key amino acids are added to slow lactic acid build-up, aid in recovery and help maintain mental focus and reduce fatigue. Higher levels of citrates help speed the conversion of carbs into energy. Finally, the amino acid complex OKG limits the body's tendency to break down muscle tissue during extremely hard efforts.