Serious Mass
Optimum Nutrition

Serious Mass

High Energy Protein Powder Contributing to Muscle Growth
Loaded with 1258 kcal, 250g of Carbs, & 25 Vitamins and Minerals
8.4 out of 10 (1,137 Reviews)
2 Sizes
2.73 Kilograms
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4 Flavors
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Price: € 30,16 (€ 3,77 / Serving)
Flavor Rating: 7.5

Product Overview

What is serious mass?

Serious Mass is the ultimate weight gain formula.* With 1,250 calories per serving and 50 grams of protein for muscle recovery, this instantized powder makes a sizable post-workout and between meals shake.* Serious Mass gives you the tools you need to pack on pounds and - when coupled with serious weight training - develop your physique to the fullest.*


  • Adding Calories Has Never Been This Easy or Tasted So Good
  • 1,250 Calories
  • 50 Grams of Blended Protein
  • Over 250 Grams of Carbohydrates with No Added Sugar
  • Enhanced with Creatine, Glutamine, and Glutamic Acid
  • 25 Vitamins and Essential Minerals

How is it different from other gainers?

serious mass - weight gain formula - 50g of protein. pro complex gainer - lean gain formula - 60g of protein.














Ratings & Reviews

Overall Rating
1,137 Ratings
Verified Buyer Rating
413 Ratings
Average Flavor Rating
7 Flavors
Top Rated Flavor
Chocolate Peanut Butter
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.

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Verified Buyer
  • 10 Chocolate Peanut Butter

Been using this for about 3 weeks now..... if you cant eat food or are not a big eater and need to put on weight, this makes it too easy... I simply do 1 scoop with 2 cups of whole milk and 2 tb spoon of peanut butter and thats 1143 calories, my goal each day is 2660 to gain 1 lb per week and with this shake i easily get that number having 2 a day (both 1 scoop instead of the 2 it says to use). Would definitely recommend to anyone who thinks its hard to gain weight to use this.... I'm 23 and struggled with gaining weight all my life and this is making it almost too easy.....

Verified Buyer
  • 9 Chocolate
  • 10 Cookies and Cream
Verified Buyer
  • 10 Vanilla

Great Product

  • 10 Chocolate Peanut Butter

This is probably one of the cheaper weight gainers in the market. A ton of carbs, ideal for those who have fast metabolism. This product doesn't make me bloat and it is the best weight gainer I have tried in term of taste. I would still prefer Pro Gainer if they were cheaper. Also this product is packed with vitamins. So the combination of vitamins and very affordable price makes this product deserves at least 8.

  • 9 Chocolate

12LB Serious Mass Chocolate flavor taste good , mixed with milk is awesome

  • 3 Banana

12lbs of serious mass can run if i take 2 scoops in one day 1 in morning and 1 in evenign

Verified Buyer
  • 9 Vanilla
  • 3 Banana
  • 10 Strawberry

It’s agreat product it really does gain muscle mass gained a solid 7+ lbs within 3 weeks.. banana tastes like juicy fruit gum . I got banana and strawberry to mix together in shakes not greatest idea.. vanilla is delicious and it’s the way to go.

Verified Buyer
  • 9 Chocolate Peanut Butter

I was quite impressed with the taste,however I did just buy two 45oz shaker bottles. That being said if I had it in a normal sized bottle it would have been like drinking pudding. This is a mass gainer for skinny guys like me with a fast metabolism,with 1270 calories and 249 grams of carbs. Having 249 grams of carbs I would not recommend if you just trying to put a little size on , this will make you fat. It is high in sugar , 26 grams with water with low fat milk it has 61 grams of sugar !

Verified Buyer
  • 8 Chocolate Peanut Butter

The bag was sealed incorrectly making it impossible to open so I had to cut a hole in it to get the powder out. Also most of the powder coagulates to the the top of the milk making much of it go to waste. Skip this product

Verified Buyer
  • 4 Vanilla

I am 48 years old, and the older I get the more my appetite decreases. I can’t put away the food I once did and protien by Optimum really helps in maintaining my weight. With working out I even put on 15 lbs of muscle with this powder. I think the vanilla flavor is the best tasting vanilla I ever had. Great with mixing with fruits etc or just by itself. Love this product and love the price! It is the protien I will always use.


If your looking to gain extended mass or weight this is a Great Option, if you Put in the intensity, Ectomorph go too Product, therefore if you Don't have an Effective workout plan, or A Measure of how your a metabolism and Body Composition works, you"ll find Quiet a Few Buttheads in the Reviews

Verified Buyer

Do yourself a favor and get the big 42oz blender bottle.. I never needed a blender again. Considering the price and the quality of the company, this is my go-to bulking powder. I found most success waiting until an anabolic window opens before consuming, I metabolize it much quicker and don’t feel sick or rushed to the bathroom. Forcing this down is the worst thing in the world as is any bulking supplement. Splitting it into two 1-scoop servings is also a great way to ensure your metabolism stays in check. If you’re lifting weights and want to see changes you’ve found the product you need.

Verified Buyer
  • 10 Chocolate

great tasting, good for gaining if you have a really fast metabolism like me

  • 6 Vanilla

Personally feel eating more food is the better route. Was thinking drinking the extra calories to get bigger would be a easier alternative, but the serving size of serious mass is a bit ridiculous. looks scooper looks like what I use for laundry detergent. Just personal opinion.

2.73 Kilograms
2.73 Kilograms
8 Servings | € 3,77 Per Serving
€ 30,16
5.45 Kilograms
5.45 Kilograms
16 Servings | € 2,85 Per Serving
€ 45,61

What's in Optimum Nutrition Serious Mass

6 Lbs. Banana
Supplement Facts
Serving Size2Scoops(334g)
Servings Per Container8
Per 334g
Energy 5273kJ
Protein 53.1g
Total Carbohydrate 251.4g
Of Which Sugars 29.7g
Total Fat 4.4g
Of Which Saturates 1.3g
Of Which Trans Fat 0g
Dietary Fiber 0g
Sodium 605mg
Vitamin A 299.3mcg
Vitamin D 1.9mcg
Vitamin E 3.5mg
Vitamin C 21.9mg
Thiamin (Vitamin B1) 0.5mg
Riboflavin (Vitamin B2) 0.6mg
Niacin (Vitamin B3) 6.7mg
Vitamin B6 0.7mg
Folic Acid 71.3mcg
Vitamin B12 0.5mcg
Biotin 54.8mcg
Pantothenic Acid (Vitamin B5) 2.1mg
Potassium 1,229mg
Chloride 649mg
Calcium 556.2mg
Phosphorus 190.7mg
Magnesium 74.1mg
Iron 4.3mg
Zinc 4.8mg
Copper 0.6mg
Manganese 0.7mg
Selenium 26.8mcg
Chromium 130.4mcg
Iodine 66mcg
Creatine Monohydrate 1g
L-Glutamine 501mg
Glutamine Peptides 501mg
Choline Bitartrate 607.9mg
Inositol 250.5mg
Maltodextrin, Protein Blend (Whey Protein Concentrate*, Calcium Caseinate*, Egg Albumen), Flavorings, Mineral Blend (Di-Potassium Phosphate, Sodium Chloride, Ferric Pryophosphate, Zinc Oxide, Copper Gluconate, Manganese Sulfate, Chromium Chloride Hexahydrate, Potassium Iodide), Whey Powder*, Medium Chain Triglycerides, Creatine Monohydrate, Color (Curcumin), Choline Bitartrate, L-Glutamine, Glutamine Peptides, Acidity Regulator (Malic Acid),, Inositol, Vitamin Blend (Dextrose Monohydrate, Ascorbic Acid, Vitamin E Acetate, Niacinamide, Biotin, Vitamin A Acetate, Calcium-D-Pantothenate, Pyridoxine Hydrochloride, Folic Acid, Cholecalciferol, Thiamin Hydrochloride, Riboflavin, Cobalamin), Sweetener (Sucralose).
* From Milk
Allergen Information:
Contains Milk, Egg, Wheat (Gluten)

Directions For 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. Then add a few ice cubes and, if desired, other calorie-contributing ingredients and blend for an additional 30-45 seconds.

Tips: Mixing two scoops of Serious Mass with 24 oz (710 mL) of nonfat or low fat milk instead of water 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.

Serious Mass is a substantial weight-management supplement that can be used to feed serious calorie needs in a variety of different ways.

Between Meals: Drink 1/2-1 serving of Serious Mass between meals to maintain and support muscle growth as well as contributing to a high-calorie diet.

Post-Workout: Begin drinking 1/2-1 serving of Serious Mass 30-45 minutes following exercise to support muscle growth. Before Bed: Drink 1/2-1 serving of Serious Mass about 45-60 minutes before bed to provide nutrients to help maintain muscle throughout the night.

Note: 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.

Warnings: Do not exceed the recommended daily dose. 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). Food supplements should not be used as a substitute for a varied diet. Store in a cool, dry place.

* 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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