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Optimum Nutrition Serious Mass - Muscle & Mass Gainer

Do you want to pack on some serious mass? Are you trying to bulk up and gain pounds of muscle, not pounds of fat? Optimum Nutrition has a weight gainer packed with all of the right ingredients to get you there. Introducing, Serious Mass.

What is Serious Mass? Serious Mass is the ultimate mass gainer from Optimum Nutrition! It is a high calorie protein drink to help with muscle gain, strength, and to put on weight!

Gaining weight requires you to count your calories. How much calories do I need to gain weight? It takes 3500 calories to pack on only one pound. For some, getting in enough calories can be a difficult task to achieve. Optimum Nutrition's Serious Mass contains 1250 calories per serving when made with water, and 1630 calories when made with low fat milk. With Serious Mass, it is easier to get your calorie amounts up to the right amount. Gaining weight can be difficult when you're trying to stay healthy. Many foods that make you gain weight are high in fats and sugars and terrible for your body. Serious Mass contains 50 grams of protein per serving, 250 grams of carbs, and has no added sugar! Optimum Nutrition has created a product to help you gain weight the right way, without destroying your health in the process. So if you're serious about bulking up, give Serious Mass a try! You'll see the results for yourself. 

Serious Mass Results

  • 1,250 Calories per Serving (with water)
  • Helps to put on weight/muscle
  • Helps to build and maintain muscle
  • 50 Grams of Protein per Serving
  • 250+ Grams of Carbohydrates per Serving
  • No Sugar Added
  • 1,630 calories when made with low fat milk.
  • 25 Vitamins & Essential Minerals with an emphasis on B-Vitamins and Antioxidants.
  • Enhanced with Creatine, L-Glutamine & Glutamine Peptides, Choline, Inositol, PABA, and MCTs.

What is a weight gainer?

A weight gainer are supplements that give you an enormous amount of calories in one serving to help persons who need to gain weight, muscle, and need more calories in a quick amount of time. 

How Many Scoops Of Serious Mass Should I Take?

We recommend to follow the instructions of 2 scoops. 2 Scoops is one serving, but you can always do one!

Does Serious Mass Contain Gluten?

Yes, there might be traces of gluten since there is no official stamp.

How many servings are in serious mass?

In the 12lbs bag, its about 16

Serious Mass Protein Shake Recipe

Try adding this to your shake for some extra fun!:

1/2 cups of Granola: 250 calories

1/4 cup of Chocolate Chips: 198 calories

2 tbsp. of Peanut Butter: 190 calories

1oz of Almonds: 167 calories

1oz Peanuts: 164 calories

1/2 cups Ice Cream: 160 calories

1 cup Whole Milk: 150 calories

1/2 cup Coconut: 139 calories

1 tbsp Flaxseed Oil: 115 calories

1/2 cup Oat Bran: 108 calories

1 small Banana: 105 calories

1tbsp Honey: 64 calories

1tbsp Molasses: 43 calories

Total: 1853 calories

Serious Mass Nutrition Facts

Serious Mass Vanilla Nutrition Facts

Serving Size 2: Heaping Scoops (~334g)

Servings Per Container:~16

Amount Per Serving In Water 

Calories: 1250

Calories From Fat: 35

Total Fat: 4g 6%*

Saturated Fat: 2.5g 13%*

Cholesterol: 80mg 27%

Total Carbohydrate: 254g 85%*

Sugars: 21g

Protein: 50g 100%*

Vitamin A: 5000IU 100%

Vitamin C: 60mg 100%

Vitamin D: 200IU 50%

Vitamin E: 30IU 100%

Thiamin: 4.8mg 320%

Riboflavin: 4mg 235%

Niacin: 50mg 250%

Vitamin: B6 5mg 250%

Folic Acid: 400mcg 100%

Vitamin: B12 10mcg 167%

Biotin: 300mcg 100%

Pantothenic Acid: 25mg 250%

Calcium: 630mg 63%

Iron: 5mg 28%

Phosphorus: 460mg 46%

Iodine: 150mcg 100%

Magnesium: 140mg 35%

Zinc: 15mg 100%

Selenium: 70mcg 100%

Copper: 1mg 50%

Manganese: 2mg 100%

Chromium: 120mcg 100%

Molybdenum: 75mcg 100%

Sodium: 430mg 18%

Potassium: 940mg 27%

Creatine Monohydrate: 1g

L-Glutamine: 500mg

Glutamine Peptides: 500mg

Choline (As Choline Bitartrate): 250mg

Inositol: 250mg

PABA (Para-Aminobenzoic Acid): 5mg

Serving Size 2: Heaping Scoops (~334g)

Servings Per Container:8

Amount Per Serving In Low Fat Milk

Calories: 1640

Calories From Fat: 170

Total Fat: 19g 29%*

Saturated Fat: 12g 60%*

Cholesterol: 140mg 47%

Total Carbohydrate: 293g 98%*

Sugars: 57g

Protein: 74g 148%*

Vitamin A: 6500IU 130%

Vitamin C: 66mg 110%

Vitamin D: 500IU 125%

Vitamin E: 30IU 100%

Thiamin: 5.1mg 340%

Riboflavin: 5.2mg 306%

Niacin: 50.6mg 253%

Vitamin: B6 5.3mg 265%

Folic Acid: 436mcg 109%

Vitamin: B12 12.7mcg 212%

Biotin: 300mcg 100%

Pantothenic Acid: 27mg 270%

Calcium: 1400mg 140%

Iron: 5.3mg 29%

Phosphorus: 1160mg 116%

Iodine: 150mcg 100%

Magnesium: 239mg 60%

Zinc: 18mg 120%

Selenium: 70mcg 100%

Copper: 1mg 50%

Manganese: 2mg 100%

Chromium: 120mcg 100%

Molybdenum: 75mcg 100%

Sodium: 820mg 34%

Potassium: 2170mg 62%

Creatine Monohydrate: 1g

L-Glutamine: 500mg

Glutamine Peptides: 500mg

Choline (As Choline Bitartrate): 250mg

Inositol: 250mg

PABA (Para-Aminobenzoic Acid): 5mg

* Percent Daily Values are based on a 2,000 calorie diet
Daily Value not established

Other Ingredients:
Maltodextrin, Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Egg Albumin, Sweet Dairy Whey), Natural And Artificial Flavors, Vitamin And Mineral Blend (DiPotassium Phosphate, Magnesium Aspartate, DiCalcium Phosphate, Calcium Citrate, Ascorbic Acid, Niacinamide, Zinc Citrate, Beta Carotene, D-Calcium Pantothenate, D-Alpha Tocopheryl Succinate, Selenomethionine, Copper Gluconate, Ferrous Fumarate, Manganese Amino Acid Chelate, Thiamin Mononitrate, Pyridoxine Hydrochloride, Riboflavin, Chromium Polynicotinate, Folic Acid, Biotin, Molybdenum Amino Acid Chelate, Cholecalciferol, Potassium Iodide, Cyanocobalamin), Medium Chain Triglycerides, Lecithin, Acesulfame Potassium

Allergen Information: Contains Milk, Egg, Wheat (Glutamine Peptides) And Soy (Lecithin) Ingredients.

Serious Mass Gainer How To Use

How Do I Take Serious Mass:

Add two heaping scoops of Serious Mass to a blender filled with 24 oz (710 mL) of water. Blend for 45-60 seconds. You can add ice too! You can also use non fat milk instead of water and that will give you a thicker, creamier, higher-calorie shake. New users may find if beneficial to begin with 1/2 of a serving daily for the first week and then gradually increase to 1 or more full servings several times a day.

How to mix serious mass:

Between Meals: Drink 1/2-1 serving of Serious Mass between meals to maintain positive nitrogen balance and support a high-calorie diet.

Post-Workout: 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 Serious Mass about 45-60 minutes before bed to provide nutrients to recovering muscle throughout the night.

How to take serious mass to gain weight: For best results use Serious Mass 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.

Serious Mass Side Effects

Keep out of reach of children. Do not take this product if you are pregnant or nursing a baby. Check with a qualified healthcare professional before using this product if you are under 18 years of age or if you have any known or suspected medical condition(s) including diabetes, hypoglycemia, and/or if you are taking any prescription or OTC medication(s).


Maslova E, Halldorsson TI, Astrup A, Olsen SF. Dietary protein-to-carbohydrate ratio and added sugar as determinants of excessive gestational weight gain: a prospective cohort study. BMJ Open. 2015;5(2):e005839. Published 2015 Feb 10. doi:10.1136/bmjopen-2014-005839

Smith JD, Hou T, Ludwig DS, et al. Changes in intake of protein foods, carbohydrate amount and quality, and long-term weight change: results from 3 prospective cohorts. Am J Clin Nutr. 2015;101(6):1216–1224. doi:10.3945/ajcn.114.100867

Customer Reviews
5.0 Based on 9 reviews
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William B.
United States United States
Good protein

This stuff tastes good mixes in a blender well

United States United States
Favorite Mass Gainer

I love this stuff! Taste good and helps to put on weight!

Youness B.
United States United States
My favourite supplements store

Great , about to order more items

Dan H.
United States United States
Great service

Received sooner than expected . Love this stuff

Dequan A.
United States
What I Asked For

It’s exactly what I asked for. It’s a great product.

RMckee P.
United States
Optimum Nutrition Serious Mass purchase

I never received it..its been over a month now...smh

Joseph Y.
United States
One of my favorite mass gainers

Been helping me get in meals I might otherwise miss.

Kelvin H.
United States
Communication needed

My overall experience was good. However, it took awhile to get order while they waited on manufacturer. In such a case, the purchaser should be notified.

Kelvin H.
United States
A great product

Great product. Great delivery.