Roctane drink mix is one of the most carbohydrate-dense energy drinks available, with 240 calories and 59 grams of carbohydrates per serving. It is designed to be used by athletes exercising at high intensities where carbohydrate is used almost exclusively as a fuel source, or for ultra endurance athletes who need to keep their calorie consumption in the 300 calorie/hr range for hours on end and when eating solid food might not be practical or possible. Roctane contains a ratio of complex to simple carbs that is ideal for absorption and plenty of electrolytes to keep you properly hydrated. It also contains Taurine, Beta Alanine and amino acids as additional key performance ingredients. Roctane comes in 2 caffeinated and one non-caffeinated flavor. Despite its caloric-density Roctane has a taste only a little stronger than GU Brew.Additional Info:Ideal carbohydrate ratio - Unique ratio of glucose and fructose are podium-proven to better maintain glycogen levels than glucose or fructose alone.Key electrolytes - Sodium and potassium properly maintain hydration.Taurine - Can help maintain heart & muscle performance during prolonged exercise which would otherwise lead to fatigue and decreased performance.Caffeine (except grape flavor) - Can stimulate the central nervous system and reduce pain perception leading to prolonged exercise, delayed fatigue and increased performance.Beta-Alanine - Supplements dietary beta-alanine to improve muscle buffering capacity and performance during intense efforts.Branch Chain Amino Acids (Leucine, Valine, Isoleucine) – Shown to serve as an additional fuel source (when taken with carbohydrates), reduce muscle damage, enhance recovery and delay fatigue – all critical during intense or long efforts.Histidine Amino Acid – helps to promote buffer capacity of muscles.