Optimum Nutrition Serious Mass is a Food Supplement Rich in Vitamins and Elements That Help in Gaining Weight in a Healthy Way Because It Contains Protein That Increases and Strengthens Muscles, and is Rich in Calories That Help in Gaining Weight That He Cannot Do. Take Out Food Features of Optimum Nutrition Serious Mass 50g Protein252 Grams of Carbs25 Vitamins and MineralsNatural Artificial FlavorsDietary Supplement1250 Calories1640 Calories From Low-fat MilkCreatineL-glutamineGlutamine PeptidesCollenInositolAminobenzoicPara-acid