Optimum Nutrition (ON) SERIOUS MASS – 12LB

 5,559.00  4,849.00

  • Optimum Nutrition Serious Mass 12 lb Chocolate helps to provide 1,250 calories in every serving, which is ultimate in a weight gain formula
  • ON Serious Mass comes with 50g of blended protein in every serving of 334g
  • Optimum Nutrition Serious Mass 12 lb Chocolate comes packed with the benefits of 25 essential vitamins and minerals for explosive muscle growth
  • ON (Optimum Nutrition) Serious Mass 12 lb Chocolate comes with more than 250 grams of carbohydrates without any added sugar content
  • ON Serious Mass 12 lb Chocolate is enhanced with creatine, L-Glutamine and Glutamic Acid
  • This is a Non-vegetarian product.


Optimum Nutrition Serious Mass 12 lb is an ultimate weight gain solution for those who need those extra calories but are going through a hard time consuming enough of them. With 1250 calories and 50 grams in every serving of protein for muscle recovery, this Serious Mass from Optimum Nutrition is the ultimate in weight gain formula. With 1,250 calories per serving and 50 grams of protein for muscle recovery support, this weight gain formula from ON makes it the ideal post-workout and between meals shake to help you attain your goals. ON Serious Mass help you enhance your physique that you have always wanted.


50g of Protein Per Serving of 334g

While achieving 100% of your daily protein requirement, Optimum Nutrition Serious Mass 12 lb Chocolate also comes with the boon of 1250 calories and 252g of carbohydrates per serving, which helps you gain healthy weight and lean muscle mass.

25 Essential Vitamins and Minerals

Optimum Nutrition Serious Mass 12 lb Chocolate is enriched with 25 important nutrients that can fulfil your body’s nutritional requirement very easily. It contains creatine, L-Glutamine, glutamic acid, Glutamine pepsides, Choline, Inositol, and MCTs, which can speed up your recovery phase, post-workout.


Add two heaping scoops of Optimum Nutrition Serious Mass 12 lb Chocolate to a blender filled with 24 oz (710 mL) of water. Blend for 45-60 seconds and then add a few ice cubes. If desired, add other calorie-contributing ingredients and blend for an additional 30-45 seconds.


Mixing two scoops of Optimum Nutrition Serious Mass 12 lb Chocolate with 24 oz (710 ml) of non-fat or low fat milk instead of water will give you a thicker, creamier, higher-calorie shake. First time users may find it beneficial to begin with 1/2 of a serving daily for the first week and then increasing it gradually to 1 or more full servings several times a day.
Optimum Nutrition Serious Mass 12 lb Chocolate is a substantial weight-gain supplement, which can be used to feed to your serious calorie needs in a variety of different ways.

Between Meals

Drink 1/2-1 serving of Optimum Nutrition Serious Mass Chocolate between meals to maintain positive nitrogen balance and support a high-calorie diet.


Begin drinking 1/2-1 serving of Serious Mass 30-45 minutes following exercise to support maximum recovery.

Before Bed

Drink 1/2-1 serving of Optimum Nutrition Serious Mass 12 lb Chocolate about 45-60 minutes before bed to provide nutrients to recovering muscle throughout the night.


For best results use Optimum Nutrition Serious Mass 12 lb Chocolate combined with intense weight training (3-5 times per week) and a sensible whole foods diet. Also, keep in mind that sufficient recovery between workouts impacts your ability to gain lean mass. Allowing at least 48 hours between workouts involving the same body parts is recommended.

From the manufacturer

6 reviews for Optimum Nutrition (ON) SERIOUS MASS – 12LB

  1. Inderpreet

    Recieved this product today, the delivery was on time… and most of all product was authentic with importer label and all details, not fake at all… i have never relied on other mass gainers as this has resulted best.. had bought 6lbs jar before and i gained 3kgs of pure mass with less fat.. did some shredding later and now back on bulk mode bought 12lbs cant wait to see the results again.. guys dont worry about lil extra fat that can be shredded later and for those r new to this or have digesting problem start by half scoop morning and half by night, later increase ur intake accordingly…and take some liv52 DS it will help better… good luck everyone let the gains begin!

  2. Deepak

    Undoubtedly the best mass gainer out there in the market. I have used most of the gainers to pack some pounds and have time and again come back to the good old Serious Mass for some effective growth of muscles.
    Inspire of all the complaints regarding bloating and feeling lethargic, which are common with every calorie dense mass gainer, this is hands down the best one to take for gaining requirements. It was my 3rd time with Serious Mass and it has not left any chance to fall short of my expectations. An easy gain of 5-6 pounds is something everyone would obviously get.
    Go for it and make sure to buy only the authentic ones.

  3. Devbrat

    I am a total fan of Optimum Nutrition. All products from ON is best in class. I like serious mass a lot. But please don’t purchase too much. Please purchase that much you can consume.

  4. Nilesh

    Just a Send some sample to Laboratory. Its good. Price ia Best. Lets Hope its gonna Work. The Product is Good and Quality .
    About Use and Result write in a Month. Now 67 Kg Target Is 10+ Kg in Month I hope so

  5. Sammy

    It has been almost a month, taking it as described. Seems I have gained 500 Gms in this time. I cant say if ts 500 Gms gain as it should be checked in the next month.

  6. Vinod

    I have used ON whey. ON is always a recommended brand. Good product with additional vitamins. Started using it now. Let’s see the results after a month.

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