Optimum Nutrition has been trusted to provide the highest quality in post-workout recovery for over 30 years and in 90+countries. After careful supplier selection, each ingredient is tested to assure exceptional purity, potency and composition. We hold ourselves to the highest production standards, all so you can unlock your body’s full potential.

Serious Mass is the ultimate in weight gain formulas. With 1,250 calories per serving and 50 grams of protein for muscle recovery support, this instantized powder makes the ideal post-workout and between meals shake for sizing up your goals.

Serious Mass provides you with the tools you need to pack on the pounds and help you develop the physique you’ve always wanted.