It contains 4 parts carbohydrate to 1 part whey protein hence the name research shows that this critical ratio when used during exercise provides athletes with more energy than carbohydrate alone based on the award winning complex carbohydrate found in standard energysource 41 is easy on the stomach hypotonic and refreshing performance proven in the toughest races most endurance athletes should be aware the primary cause of fatigue is the depletion of muscle and liver glycogen carbohy