Optimum Nutrition Serious Mass - Chocolate 6lb

What it is

Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering around 1,250 calories and 50g of protein per two-scoop serving, plus over 250g of carbohydrates and added creatine, glutamine and vitamins, to help hard-gainers build size and mass. It is best used alongside your regular meals to reach a calorie surplus. This 6lb tub in Chocolate provides about 8 servings.

Chocolate hides the sheer volume of powder better than most flavours, which matters when a serving is two full scoops.

Who it's for

People taking on a proper calorie surplus for the first time, who would rather learn how their stomach handles a two-scoop shake on a small tub than a large one.

How to use it

Blend two scoops with water or milk once or twice a day between meals or after training.

Worth knowing

Milk in the formula. If your goal is definition rather than size, this is the wrong shelf entirely — ask us about whey instead.

Our take

Eight servings is the size we recommend for a first go at Serious Mass — enough to see how you handle 1,250 calories in a glass before committing to the 12lb. Beginners should split it in half for the first week or two; a full two scoops is more than most people expect it to be.

More in this range

In stock

Rule 1 Mass Gainer - Chocolate 12lb

In stock

Rule 1 Mass Gainer - Vanilla 12lb

In stock

Rule 1 Mass Gainer - Vanilla Creme 6lb

In stock

Rule 1 Mass Gainer - Chocolate Fudge 6lb

Ask us

BAAM Ultra Mass - Vanilla 6lb

In stock

Optimum Nutrition Serious Mass - Vanilla 12lb

In stock

Optimum Nutrition Serious Mass - Chocolate 12lb

In stock

VX Clean Mass Hi-Protein Gainer - Chocolate 6lb