Optimum Nutrition Serious Mass 5.45kg - Cookies & Cream Post-Workout This unique structure leads to

This unique structure leads to micellar casein taking longer to digest than whey protein

Energy Gel Caffeine is designed to be taken BEFORE and DURING exercise

peanuts are a natural source of protein (25% of their calories come from protein) and are perfect for maintaining a healthy diet

increasing power and endurance

Optimum Nutrition Serious Mass 5.45kg - Cookies & Cream Post-Workout This unique structure leads toOptimum Nutrition Serious Mass provides 50g of protein and over 1,250 calories per serving. Its an ideal supplement for individuals aiming to increase their muscle mass and overall size. Serving Size: 2 scoops (334g) Servings Per Container: 16