Optimum Nutrition Serious Mass Review

Serious Mass Weight Gainer Overview


  • Editor Rating

  • Rated 4.5 stars
  • 90%

  • Serious Mas
  • Reviewed by:
  • Published on:
  • Last modified: June 16, 2015
  • Overall Quality
    Editor: 100%
  • Price
    Editor: 85%
  • Effectivness
    Editor: 95%

Summary: If you’re looking for an efficient and relatively cost-effective way of adding a ton of high-quality calories to your diet then Serious Mass is definitely a supplement you’ll want to consider adding to your hypertrophic arsenal.

>> Ranked #4 in our Top 10 Weight Gainers List for 2015

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What Does Optimum Nutrition Serious Mass Do?

With over a thousand calories per serving, this product packs one heck of a muscle-building punch, and with five different flavors available you’re never going to be short of awesome tasting shakes to keep your strength and size gains coming month after month.

What’s in Optimum Nutrition Serious Mass?

There are a lot of ingredients in Serious Mass so hold onto your hats and let’s take a look:

  • Maltodextrin
  • Protein Blend – containing Whey Protein Concentrate, Calcium Caseinate, Egg Albumin, and Sweet Dairy Whey
  • Medium Chain Triglycerides or MCTs
  • Creatine Monohydrate
  • L-Glutamine
  • Glutamine Peptides
  • Choline Bitartrate
  • Inositol
  • PABA (Para-Aminobenzoic Acid)
  • Vitamin A
  • Vitamin B6
  • Vitamin B12
  • Vitamin C
  • Vitamin D
  • Vitamin E
  • Thiamin
  • Riboflavin
  • Niacin
  • Folic Acid
  • Biotin
  • Pantothenic Acid
  • Calcium
  • Iron
  • Phosphorous
  • Iodine
  • Magnesium
  • Potassium
  • Zinc
  • Sodium
  • Copper
  • Manganese
  • Chromium
  • Molybdenum

on serious mass nutrition label

How and When Do I Take Serious Mass?

Use two heaping scoops added to 24oz of chilled water. This product can be used in a food processor or shaker, providing you use enough water.

It is generally recommended that first time users begin by using just one scoop to test your gastrointestinal tolerance to some of the ingredients. Once you are comfortable after a few days you can begin to increase your intake up to several full servings per day.

Serious Mass can be used in between meals, post-workout, or even before bed; basically, chug some whenever you feel like your body could do with a massive heap of calories.

What are the Benefits?

ON Serious Mass provides a whopping 50g of protein and 252g of carbohydrates per serving, for a total of 1250 calories with only 4.5g of fat, most of which comes from high-quality medium chained triglycerides.

Let us not forget the additional ingredients such as creatine, glutamine, and minerals that will help your muscle cells to stay fully hydrated while also ensuring your body is able to shuttle all of those nutrients to your muscles rather than your fat cells.

To my mind, the main benefit of using a weight gainer product like Serious Mass is the sheer convenience of being able to blend up an incredibly delicious shake within a matter of seconds rather than having to prepare the individual ingredients or eat a solid meal.

This is especially true for those of us who don’t have a huge appetite and loathe having to eat chicken breast, rice, and broccoli every couple of hours!

Are there Any Precautions?

If you are diabetic, suffer from severe insulin resistance, or are currently using any forms of OTC or prescription medication then you are strongly advised to consult with your doctor or physician before using Serious Mass.

Each serving packs a significant amount of carbohydrates, much of which comes in the form of fast-digesting sugars, so those of you who are already holding onto a lot of body fat will probably want to opt for whole food sources with plenty of lean protein and fibrous vegetables.

This product contains creatine so you are advised to consume it with a large amount of water.

Women who are pregnant or nursing are advised not to use Serious Mass.

Available Flavors and Serving Sizes

Optimum Nutrition Serious Mass is available in the following flavors:

  • Banana
  • Chocolate
  • Chocolate Peanut Butter
  • Strawberry
  • Vanilla

It is also available in the following serving sizes:

  • 3lbs
  • 6lbs
  • 12lbs

It’s great to see the serving sizes scaled as they are, although you should be aware that some flavors are limited to certain serving sizes, so you’ll want to double check that your preferred flavor is available before making your final purchase.

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Optimum Nutrition Serious Mass Review

Overall Quality

Sometimes when it comes to really pushing the envelope and putting on a lot of size, many of us may need to resort to eating less-than-ideal foods, but regularly compromising on food quality just to ‘get the calories in’ is not always the best way to go.

For this reason, I would recommend that if you are going to purchase a weight gainer shake like ON Serious Mass then educate yourself on the purpose of the primary ingredients to make sure it is something that you really need.


Serious Mass definitely has some quality ingredients, and I’m particularly impressed by the protein blend which offers an array of proteins that digest at varying rates to ensure your blood amino levels remain constant.

It isn’t very difficult to determine the efficacy of a weight gainer shake because the calories are there, and that’s obviously the main focus. Having said that, there are a ton of vitamins and minerals in Serious Mass, so this should definitely help to fill any gaps in your diet.

I also think that throwing some creatine and glutamine into the mix helps to provide more of an all-in-one supplement so that you don’t have to spend your money on the individual components.


Protein, flavorings, sugar… surely you don’t need me to tell you that this product tastes absolutely out of this world!

The texture is rich and velvety, the flavors taste very authentic (you must try the Chocolate Peanut Butter), and the general consensus from users has been that Serious Mass is easy to digest and goes down an absolute treat.

Serving sizes are quite large, so you’ll definitely want to use a large blender or shaker to ensure the product mixes thoroughly, but other than that there really aren’t any complaints to be made here.

Is it Worth the Money?

When it comes to weight gainer shakes I generally prefer to take the old-school and slightly more cost-effective route by throwing some basic protein powder into a blender along with some oatmeal, bananas, and peanut butter.

This kind of shake is more than suitable for those of you who are on a tight time budget, and provides a quick and easy way to consume 1,000+ calories within a matter of seconds. Although it’s a bit costly, you do get what you pay for. Skip on this product if you are not serious about bulking up and gaining mass quickly.

Of course, those of you who are really struggling on this front would stand to benefit from getting in a lot of calories in the form of a convenient product like Serious Mass.

Wrapping Up

Serious Mass really is for those of you who are either eating thousands of calories on a daily basis while training hard and not seeing any weight gain.

This does not mean all you 150lb ‘hard gainers’ who eat two or three times a day and wonder why you aren’t gaining any weight; it means those of you who are legitimately training your butts off while eating three, four, or even five thousand calories a day with no results.

Very few of you will have such ‘hot’ metabolisms that you need to consume such an obscene amount of food at a bodyweight below 200lbs, but if you’re being honest with yourself about needing a product like Serious Mass then the quality and popularity definitely speak for themselves.

When all is said and done, some of us are just looking for a convenience and taste, so if this sounds like you then I would definitely, definitely recommend checking out Optimum Nutrition Serious Mass because it is hella convenient and; regarding the taste, trust me and just try the Chocolate Peanut Butter!

Get the Lowest Prices on Optimum Nutrition Serious Mass Weight Gainer

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Please note: This post has not been written or reviewed by a doctor or medical professional and is therefore not to be used to prevent, diagnose, or treat any disease or illness.

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