Mass gainers, or weight gainers, are specialized supplements designed to help individuals increase muscle mass and weight. They provide a convenient way to boost calorie intake, particularly for those with high metabolic rates or difficulty consuming enough calories through regular meals alone. Typically containing a mix of carbohydrates, proteins, and fats, mass gainers support muscle growth, replenish energy levels, and promote overall health. When used alongside a balanced diet and exercise regimen, they aid in achieving weight and muscle mass goals effectively.