High5 energy source plus caffeine drum 22kgenergysource plus is a new generation sports drink for use during exercise it contains a carbohydrate formulation of maltodextrin and fructose in a ratio of 21 and key electrolytes energysource plus is the same formulation as standard energysource except that plus contains caffeine 60mglitre magnesium and a higher level of electrolytes research suggests that you should consume a maximum of 60g carbohydrate per hour from traditional sports drinks