A high-calorie, easily digestible carbohydrate-protein product intended to be used as a supplementary meal/meals or as a meal replacement to increase the total caloric content of the diet during the muscle gain phase for people who, for various reasons, have problems in gaining mass or in set of calories. GAINER The main function of the gainer is to provide anabolism, that is, the synthesis of various biochemical compounds to restore old and new cellular structures.