Optimum Nutrition Serious Mass is a high-calorie weight and mass gainer built for hard gainers looking to add size. Each serving delivers a big hit of calories with 50g of protein and a large dose of complex carbohydrates to fuel muscle growth and support a calorie surplus, plus added creatine, glutamine and a blend of 25 vitamins and minerals. It mixes into a thick, satisfying shake — use it between meals or post-workout to hit your daily calorie and protein targets. Blend 2 scoops with water or milk (milk boosts the calories and protein further). 6lb tub, around 32 scoops.
