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Optimum Nutrition Serious Mass

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Optimum Nutrition Serious Mass - High-Calorie Weight Gainer! Weight Gainer With 50g Of Protein, Over 250g Of Carbohydrates With No Added Sugar, Glutamine, Creatine & 25 Vitamins & Essential Minerals!

Protein Powder Weight Gainer! Loaded with 1,250 Calories, 250g of Carbs, & 25 Vitamins and Minerals to Pack on Pound!

Serious Mass: the ultimate in weight gain formulas. Serious Mass supplies you with the tools you need to pack on the pounds and develop the physique you've always wanted. Each serving of Serious Mass contains 1250 serious calories derived primarily from protein sparing complex carbohydrates and a high quality protein blend consisting of Whey Protein Concentrate, Calcium Caseinate, and Egg albumen. Creatine Monohydrate, Glutamine, Choline and Inositol have been added to optimize each strength training workout while a complete vitamin and mineral profile insures your body gets the balanced nutrition it needs.

Packing a very substantial 1,250 calories into every serving – even more when mixed with cold milk – Serious Mass is the ultimate weight gain formula. With 50 grams of muscle building protein, when used in conjunction with a healthy, balanced diet and regular weight training, this powdered mix provides you with serious weight gaining support for developing your physique to the fullest.



Optimum Nutrition has been spotting the efforts of goal driven individuals since 1986. As one of the few companies to own and operate state-of-the-art manufacturing facilities that are GMP compliant and NSF Certified for Sport, ON assures that every shake will mix up effortlessly because the company started instantizing powdered products back in 2000. You also expect each shake to taste the same as the last and your next. That’s the kind of consistency ON delivers.



Optimum Nutrition is legendary for both quality and innovation. In addition to producing the world’s best-selling whey protein, ON’s Gold Standard 100% Casein introduced slow-digesting nighttime protein to the weight training world and Amino Energy created the anytime energy category in sports nutrition. When technology makes advancements possible, ON will be the company bringing it to you.


Note: Manufacturers continually change product specifications. While we try our best to keep product descriptions up to date, they do not necessarily reflect the latest information available from the manufacturer. We are not responsible for incorrect or outdated product descriptions and/or images.

  1. Quality
    #1 MOST Calories per serving Weight Gainer
    I've researched all weight gainer products and found this product has the MOST CALORIES per Dollar you spend.. In other words , the lowest priced weight gainer with the MOST amount of Calories in ALL THE online Supplement MARKET on .. Saved you all some time and headache calculations
  2. Quality
    Near Perfect
    I chose this mass gainer because of its ingredients. The fast acting carb complex makes it great to have when I wake up. I have tried the strawberry and chocolate. Strawberry tastes really artificial and is a chore to drink. The chocolate mixes well and is easier to stomach. Solid mass gainer for anyone looking to add extra calories in their diet.
  3. Quality
    I have been using serious mass for about five years and it has kept my weight up.
  4. Quality
    Serious mass
    Good mass gainer by optimum and great flavor. Will buy again!
  5. Quality
    Great taste, great gains, Will order again!
  6. Quality
    Awesome Product
    I’ve used serious mass twice for about 4 months each time.. Both situations I was more than impressed with the results.. It delivers everything you need to gain, all while not taking away from a great taste
  7. Quality
    Great taste
    Easy to blend and great tasting weight gainer.
  8. Quality
    Great Tasting Mass Gainer!
    I’ve used Serous mass for years and it works. Don’t let the cheap price fool you, it is highly effective and tastes great. I don’t use the full scoop provided, I just use a regular protein scooper and add a couple small scoops to my regular whey protein shake and 24oz of fat free milk. Loads you up on carbs, vitamins and minerals. You will put on size at a good pace without the growing pains and stretch marks of adding too much size too quickly. Essential.
  9. Quality
    Great Product!
    This weight gainer is great! Love the strawberry flavor.
    I use it in protein shakes as well as in greek yogurt to add more protein!

    I am in rehab from a hernia surgery and have purchased this item to assist in gaining back weight/muscle as part of my needing to gain back about 25 pounds (lost as part of my surgery and complications).

  10. Quality
    Great weight gain supplement. Added 12 pounds of mass.

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These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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