NOW Carbo Gain is 100% pure maltodextrin, an easily digestible complex carbohydrate derived from corn.&ampnbsp; Maltodextrin contains "glucose polymers", linked sugar compounds that are easier for the body to assimilate and use.* Glucose polymers are metabolized at a slow, steady rate that can help to sustain energy levels during endurance-oriented workouts and/or athletic events and/or athletic events and support weight gain. &ampnbsp;Carbo Gain contains virtually no protein, fat or fiber and is a convenient source of energy for active individuals.*