ON (Optimum Nutrition) Serious Mass

(28 customer reviews)

3 in stock

Goal: Muscle Building, Gain Size
Servings: 8 (6 Lb) | 16 (12 Lb) serving size 334 G
50 G Protein | 254 G Carbs | 4 G Fats – Contains Creatine, Glutamine and Glutamic Acid 

Imported by Glanbia (Official) Fulfilled by Acacia World

Delivered in 3-9 working days    EMI Option Available with Razorpay



Optimum Nutrition Serious Mass is for those looking to put on some ‘Serious’ Mass. 

With 1250 calories, 250 G Complex Carbs, Creatine, Glutamine & 50 G high quality Protein per serving, you know you can never go wrong. Serious Mass is an instantized powder, that mixes easily and tastes great.

If you want to pack up some weight for your dream physique, look no further. Just take care of your workouts and your diet, leave the rest to serious mass.

Optimum Nutrition Serious Mass contains No Added Sugar. It also contains 25 vital Minerals and Vitamins to support your muscle building.

 Acacia World sells authentic Optimum Nutrition products sourced directly from Glanbia’s warehouse in India


Mix 1 serving (334 g) in 500 ml water, milk or any other liquid per day. Best time to use is after workout. If you feel difficulty in digesting the recommended serving, we suggest that you consume 1 scoop after workout and 1 scoop between meals (or at night before going to bed)

Serving Size: 2 Scoops

SKU: ON006 Categories: ,

Supplement Facts


How to Use

Based on 28 reviews

4.4 overall

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  1. Nilesh

    100% original from Acacia World

    taste and mixability was superb waiting for the results


  2. Lalit

    Good product

    i gain 10 kg in 2 months, hoping i wont lose it back. If i don’t then stars


  3. Rajpal Dhillon

    very good

    service of acacia world is very good. I have started trusting the products i get from you people. i am getting good results. i have recomended 2 friends. please provide some reference discounts also.

    Rajpal Dhillon

  4. Marwin Singh

    So so product

    taste is amazing and mixebality is good acacia world always provide genuine product I believe on acacia. but i don’t get results i want with serious mass. i used san mass effect and that was good.

    Marwin Singh

  5. siddique shami

    Less production

    hope anyone will not want to see this option “Notify Me!!” when we want to place an order.Please try to maintain a plenty of this product. also try to have more flavours.

    siddique shami

  6. Vibhushan patil

    quite good for weight gain

    great product, first of all my weight used to be 52kgs before using the product , i wanted to test this powder (first time ) , i bought this power 2 times and i am now 60 kgs! great improvement that too within 1.5 months!

    Vibhushan patil

  7. Harsh mehta

    Good for quick weight gain

    Serious Mass is something I really would like have after workout. Will help you to quickly gain weight. but i want the weight to remain gained and not lose after stop using the product.

    Harsh mehta

  8. Abhishek solanki

    Superb results, tested it twice.

    Had a 12 Lbs Chocolate, two years back from healthkart. Nice bulk I had. Again I started working out recently, bought a 12lb pack from you guys (the price was quite attractive), I took it with low fat milk, 1 serving of ON creatine monohydrate, Post workout. SUPERB gains 6Kgs and it is yet to finish. My foolish trainer didn’t let me do Cardio/ Abs so I have a decent belly to work when I will cut. Do watch your belly while taking any Mass gainers, because no one else but YOU would have to do extra work to cut that unnecessary fat you gain, otherwise its perfect.

    Abhishek solanki

  9. Pawan Kumar

    It works

    First of all thanks to Acacia for having different sets of offer on their products. Got delivered on time with no damage. Now about the product..I am buying the Serious mass On for the 2nd time from Acacia. Before I used to buy it locally. The way I used it to gain weight was taking 1.5 to 2 scoops daily 3 times. Morning, Before hitting Gym @ evening and at night before sleeping. Remember to do exercise or else you start getting fat at unwanted areas.

    Pawan Kumar

  10. CSUKLA

    My serious mass experience is great!

    Guys I would definitely recommend you to try Serious Mass if you are really serious to gain. I have tried many til yet and now I got result with serious mass. Optimum Nutritions is the best way to gain your mass. Love it!


  11. Manoj kadir



    Manoj kadir

  12. Anmol dubey

    ON serious mass

    The best product to put on weight..I am sure, you’d say the same if u buy this one…

    Anmol dubey

  13. Anil

    Good. If it would have been strawberry then best.

    The best mass gainer for real bulking. But please provide other flavors for buying. Strawberry would be the best to try.


  14. sriram reddy

    Awesome product

    On serious mass is the best weight gainer . I hv used 12 lbs packet . I started it on 11 January and lasts till 19 feb . It helped in gaining 7 kgs . My diet was normal but my workout was very hard . Thumbs up for ON

    sriram reddy

  15. Vishal Krishnamurthi

    No#1 in market. After wasting money on others, gained 7 kgs with this!!!

    I am a classic entomorph since childhood…thought of seriously gaining weight now and did a lot of research…99% people with whom i talked (who also were underweight and then gained a lot) suggested to go with serious mass…online reviews also helped a lot… So here goes my experience with ON serious mass: Did gym 4 days a week in a combination of chest+tricep, back+biceps, shoulders+abs and legs, Concentrated mainly on heavy weight and reps of 4-8. 100 gms of serious mass twice with full fat milk with extra diet like eggs, peanut butter, brown bread. Gained 7 kgs in 1.5 months by consuming one 12 lb packet of serious mass. Now using ON gold standard whey to put on muscle mass while weight gain is around 0.5 kg/month. Weight actually shot to 73 kgs due to tummy but when i stopped taking serious mass with combination of abs, reduced by 2 kgs and tummy is flat now. All other parts, its muscle gain and weight gain is constant even if i had’t been to gym for last 2 months but of course taking diet more than normal. I think serious mass increased my appetite as well. So guys, ON alone will not do anything but with right exercise and diet also need to be followed, it will prove to be the best in market. P.S. Earlier had used Ultimate nutrition mass gainer in same fashion. Weight gain was just 2 kgs. P.P.S. Height: 5’11”. Weight before: 62 kgs, Now: 71 kgs. Target to reach 75 kgs but now with the help of ON whey protein.

    Vishal Krishnamurthi

  16. Nithin Takra

    Best there was best there is and best there ever will be 😀

    Highly recommended for those going for bulk. Mixes really well and tastes like the best banana shake. Experienced no side effects but a friend got back acne. Its a bit costly on Acacia but gives you value for money.

    Nithin Takra

  17. Nishanth

    NO sugar protein

    I would suggest ON Serious mass coz it contains no added sugars which may make you feel bloated the results of ON products are amazing.


  18. Kunal

    Blended protein

    ON Serious Mass is far superior product which contain 50g of blended protein for muscle recovery and development, it is also enhanced with creatine, Glutamine and Glutamic Acid required by the body and muscles. If you are looking for gaining weight then you must go with ON Serious Mass


  19. Kaushik Dutta

    ON the Brand You Trust For Quality

    There is no match to the quality of ON Products, Among mass gainers ON is the only product which helps you to Gain Very fast and contains minimum quantity of fat. I have used it ever since i started weight training.

    Kaushik Dutta

  20. Rahul Sinha

    Ultimate Weight Gainer

    ON Serious Mass is the ultimate in weight gainer Supplement. With less than 5 grams of fat per serving, and no added sugars, Serious Mass is the best weight gain formula packed with calories that count during recovery.

    Rahul Sinha

  21. Tejas


    This is my first time to use any product to increase muscle mass, My Gym instructor suggested me to go with On Serious mass and i am happy that he was really right. I could feel the results after around 15 days of use. This is awesome product.


  22. Santosh mishra


    On Serious mass is the best product to gain mass. it has all the required amino acids needed. taste is very pleasant and readily absorbs from stomach. I would suggest all the beginners to go with ON Serious Mass. It is really value for money

    Santosh mishra

  23. Prajwal

    highly recommended

    Serious mass gainer is seriously the best to help in gaining lean body mass. The chocolate flavor is just yummy. I could measure the results in just 1 month of use.. highly recommended.


  24. Sahil

    100% original from Acacia World

    Thanks Acacia World for providing 100% original product. Thank you


  25. sachin

    Tremendous result

    Serious Mass is the ultimate in weight gain formulas available in the market… Tremendous in result and great in taste…


  26. Jayram

    Safe product

    It is very good and safe product. Gained 5 kg after using this product in 1 month.


  27. Jagpreet

    Good Product

    Good Product, Go for it… Value for money spend,


  28. Sunil Kumar

    Serious protein

    ON Serious Mass really gives protein for muscle recovery support. I guess this is the right product post workout to help u recover. if u use it properly and with proper exercise it will give you the best results in no time.

    Sunil Kumar


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  • 1% Cashback on this product as Credit Points.
  • 2% Extra off when you choose Direct Bank Transfer during checkout

Checkout more Special Offers