Carbo Gain is a 100% pure complex carbohydrate supplement derived from maltodextrin, an easily digestible blend of complex carbohydrates from corn starch. Maltodextrin contains "glucose polymers", linked sugar compounds that are easy for the body to assimilate and use. Glucose polymers are metabolized as a slow, steady rate that can help to sustain energy levels during endurance-oriented workouts and/or athletic events and support weight gain.