Mass gainer protein powders, also called weight gain protein powders, are specifically formulated for athletes and weightlifters looking to pack on pounds — particularly lean muscle mass.

If you want to build muscle, research suggests that you're going to need 2.2g of protein per kg of lean body mass. However ... we've teamed up with Optimum Nutrition to offer a special discount ...

If you want to build muscle, research suggests that you're going to need 2.2g of protein per kg of lean body mass. However ... we've teamed up with Optimum Nutrition to offer a special discount ...

For instance, Optimum Nutrition’s Serious Mass Powder offers an impressive 1268 calories per serving along with 256g of carbs ...