ON Serious Mass 6 Lbs

Mass gainers, also known as weight gainers, are high-calorie protein supplements formulated to provide a significant amount of calories, carbohydrates, protein, and sometimes fats in a convenient shake or powder form. They typically contain a blend of proteins (such as whey, casein, and sometimes plant-based sources), carbohydrates (often from maltodextrin or other sources), and additional nutrients.