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Optimum Nutrition Serious Mass


Item # OptimumNutritionSeriousMass



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High Protein Weight Gain Powder

The true strength of weight gainers
Serious Weight gain requires serious calories. However, those who need the extra calories most often have the toughest time consuming enough of them. For many aspiring to be bigger, a highly-active metabolism, weaker appetite and on-the-run lifestyle can make it a real challenge to consume enough calories through whole foods alone. With Serious Mass™, you've got nothing to lose and lots to gain. We've consolidated 1250 calories, 50 grams of protein, 253 grams of carbohydrates, 25 vitamins & minerals, glutamine and creatine into every serving. It's time to stop thinking small; get serious - Serious Mass™.

Label (click image to enlarge)


Add two heaping scoops of Serious Mass™ to a blender filled with 24 oz. of water. Blend for 45-60 seconds. Then add a few ice cubes and, if desired, other calorie-contributing ingredients (see "Supercharge Your Serious Mass™" on the opposite panel) and blend for an additional 30-45 seconds.
Contains Milk, Egg, Wheat (Glutamine Peptides) and Soy (Lecithin) Ingredients.


Consult your physician before using this product if you are taking any medications or are under a physician's care for a medical condition. Not for use by those under the age of 18 or women that are pregnant, trying to get pregnant, or nursing.

Other Ingredients

Maltodextrin, Protein Blend, natural and artificial flavors, Vitamin and Mineral Blend, Medium Chain Triglicerides , Lecithin, FD&C Red # 40, Acesulfame Potassium
Manufactured by Optimum Nutrition
975 Meridian Lake Dr., Aurora, IL 60504

Nutrition Facts

Serving Size  2 Heaping Scoops
Servings Per Container  8

Amount Per Serving     % DV

Calories 1250  
  Calories from Fat 30  

Total Fat 3.5g   5%
  Saturated Fat 2g   10%
Cholesterol 80mg   27%
Potassium 990mg   28%
Total Carbohydrate 254g   85%
Phosphorus 460mg   46%
Magnesium 140mg   35%
Calcium 630mg   63%
Copper 1mg   50%
Manganese 2mg   100%
Chromium 120mcg   100%
Molybdenum 75mcg   100%
Sodium 480mg   20%
Iron 5mg   28%
Iodine 150mcg   100%
Zinc 15mg   100%
Selenium 70mcg   100%
Sugars 23g  
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%

Creatine Monohydrate  1 g   **
L-Glutamine  500 mg   **
Glutamine Peptides  500 mg   **
Choline (as Choline Bitartrate)  250 mg   **
Inositol  250 mg   **
PABA (para-amino benzoic acid)  5 mg   **

** Daily Value (DV) not established.


4.5 / 5.0
44 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Zika virus outbreak
Well I was trying out for the Arnold classic and got some mass to help me. I went from 90 kilos to 120 in 5 minutes of using this product
May 12, 2018
Do you need to work out in order to see results, or can you gain weight without working out? I’ve been underweight all my life and was hoping this would help.
May 5, 2018
It’s good. I hope I can gain weight in the right places! Taste is delicious
May 3, 2018
1 month ago
This product works extremely well. I have a really fast metabolism and couldn’t see a difference every time i worked out and just had regular protein shakes. However, with this Serious Mass, I definitely gained healthy weight and see a huge difference from my before and now. I love this product so much.
April 25, 2018
Awesome Product!
Started out at 130. I'm up to 150 in just 2 months. I'm really enjoying my new found weight gain! Serious Mass gets the job done. :)
April 19, 2018
1 month ago
It has a great taste and helps get extra calories.
April 6, 2018
2 months ago
Really smooth and great tasting I've gained 3.5lbs in a week and can already see a difference!
April 6, 2018
2 months ago
It really work
This is my second time that I’ve order it. It really work. So far I’ve gain 3-4 pounds. And it taste good. I love it.
April 4, 2018
Does what it says
Had minimal luck with other brands, but with this product in particular I was able to quickly gain mass. Be careful because if you aren’t working out consistently you will gain it as fat. Overall though, great product, does what it says it will. For reference I’m a petite female with a fast metabolism, I already lose weight easily without exercise and even more so with exercise. With this I’m able to keep my body weight consistent and by adding weights to my workout, I’ve managed to achieve a fuller more athletic figure in only a few short months.
April 1, 2018
2 months ago
Works really well first week gained 4 pounds
March 30, 2018
2 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 39 questions Browse 39 questions and 39 answers
Why did you choose this?
GNC Store
BEST TASTING PROTIEN I'VE HAD, works great I only take half of the recommened serving.
j c on Apr 9, 2015
BEST TASTING PROTIEN I'VE HAD, works great I only take half of the recommened serving.
j c on Apr 9, 2015
Can I mix serious mass with GNC whey protein for getting better result?
A shopper on Mar 22, 2016
BEST ANSWER: I would not do that
okay, i just bought on serious mass, and i was wondering, how should i use it?

I workout 3x a week(Wednesday,Friday,Sunday) Should i only use it on the workout days? should i take it everyday?

And how many servings should i use ?(twice in the morning, twice after working out?)/

need help
A shopper on Mar 27, 2014
BEST ANSWER: You could start using it by adding two heaping scoops of Serious Mass to a blender filled with 24 oz. of water. Blend for 45-60 seconds. Then add a few ice cubes and, if desired, other calorie-contributing ingredients (see “Supercharge Your Serious Mass” below) and blend for an additional 30-45 seconds.

On the workout sessions; you can use it during post-workout, begin drinking ½ -1 serving of Serious Mass 30-45 minutes following exercise to support maximum recovery.

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. New users may find it beneficial to begin with ½ of a serving daily for the first week and then gradually increase to 1 or more full servings several times a day.

You can take it between meals, drink ½ -1 serving of Serious Mass between meals to maintain positive nitrogen balance and support a high-calorie diet, and before bedtime, drink ½ -1 serving of Serious Mass about 45-60 minutes before bed to provide nutrients to recovering muscle throughout the night.

I want to know that Serious Mass Contains Lactose Or other Digestive Enzymes or not.?
A shopper on Sep 30, 2013
BEST ANSWER: Sorry, I do not see lactose or digestive enzymes on the label for this product.
How well will it digest in the body from felling so full?
Phyllis R on Mar 16, 2018
BEST ANSWER: I feel full immediately afterwards, but usually within 2-3 hours I feel normal and get my appetite back. Everyone’s different, you can also adjust the amount of powder you use or split it into two separate shakes to drink at different times of the day rather than one big filling one.
Can this product be used by females who are looking to put on some extra mass?
A shopper on Oct 25, 2013
BEST ANSWER: Yes, this product can be used by females.
hi im 18 years old im 6 in height and i weigh about 155 would you recommend this product to gain weight
A shopper on Aug 4, 2013
BEST ANSWER: This product delivers a lot of calories in a healthy form for those looking to bulk up but not looking for fat.
How many times a day was the best to take this?,and what is the best time?
A shopper on Mar 3, 2018
BEST ANSWER: In the morning with a meal and after a workout.
Does this help you get thick as well ?
Maymay on May 19, 2018
BEST ANSWER: No it didn't
How many calories is in one scoop?
youuloveang on Apr 3, 2018
BEST ANSWER: 635 in One Scoop
What can you take to avoid s
tomach pains darts issues?
A shopper on Apr 17, 2016
BEST ANSWER: If you're having stomach pains, you should probably adjust your diet, it can also be caused by dehydration.
How much protein and how many calories would be present per serving if used with whole milk?
A shopper on Aug 6, 2014
BEST ANSWER: It would contain 82 grams of protein and 1688 calories.
i am 15 years old weighing 95 pounds i am very skinny and im looking to put on weight i dont workout i just want to put on weight, how long will this product last and how much weight can i put on with it.
A shopper on Dec 31, 2013
BEST ANSWER: This will last for 5-10 days and the weight gain depends on the person.
My husband cannot have vitamin K. Is there any in this product?
A shopper on Sep 19, 2013
BEST ANSWER: There is no vitamin K listed for this product.
Is it good to take BCAA with Serious Mass or not?
A shopper on May 7, 2013
BEST ANSWER: Because of how strong serious mass is it is recommended you do not take it with BCAA.
hello im a skinny boy, 178cm 60kg, and want to use this product! i noticed it only last about 5-10 days!! so what is the result if i use one pack? what does it bring? i exercise 4 days a week
A shopper on Apr 25, 2013
BEST ANSWER: This product delivers a lot of calories in a healthy form for those looking to bulk up but not looking for fat. With exercise you are likely to just burn it back off so in theory this may not bring you anything.
Is Serious Mass ok for 16 year old boys? And at what amount?
A shopper on Feb 27, 2013
BEST ANSWER: Serious Mass is safe for use by a 16-year male. The daily dosing depends on the diet and workout program the person is on. It's considered safe at upto five shakes per day.
hi! my name is jenny. And my weight is only 80 ibs. I try to eat alot, but i still dont put that much weight in my body. I wanted to know will this product give me the results that my weight will be more than 80 ibs.?
A shopper on Jan 21, 2013
BEST ANSWER: Yes, because it adds a lot of extra calories that are needed to gain weight.
Is this product safe to take with a multi vitamin considering it contains vitamins also?
A shopper on Jan 16, 2013
BEST ANSWER: No, this product contains anywhere from 100%-250% of your daily recommended dose of most of the vitamins in an ordinary multi vitamin.
Is this prodruct legal for NCAA division 1&2 athletes?
A shopper on Jan 7, 2013
BEST ANSWER: This product contains mainly protein and none of the listed ingredients listed on the supplement facts page fall under the NCAA banned drugs list.
how long will it last if i work out pretty hard 3 times a week? it says only 16 servings
A shopper on Nov 28, 2012
BEST ANSWER: It will last 5-10 days. It will last about five days if you take 1 serving each time, because it is recommended to be taken 3 times a day and additional 1 serving after workout.
If you take 1/2 serving each time it will last about 10 days.
looking for a shake or a drink with high calories have to gain weight before starting kemo for brain cancer
A shopper on Nov 19, 2012
BEST ANSWER: This product contains 1,250 calories per serving in water; 1,630-plus calories when made with low fat milk.
hello i just purchased this serious mass but i seen it has alot of grams of protein my question is is this product bad for anxiety?? because i suffer from anxiety thanks!!
A shopper on Nov 15, 2012
my name is Sharon and i am a student of chartered accountancy. I am 23 yrs old, height is 5'10''. my weight is 62 kgs. i am very skinny. will this product help me in gaining weight with light weight exercise bcoz i have no time for heavy exercise due to studies. in what time i will become muscular?
A shopper on Oct 17, 2012
BEST ANSWER: Unfortunately, a product like this without the proper weight training and exercise, will only make you gain pounds, rather than muscle mass.
Whats the best time to use this before or after workout. I usually take it after workout when im using any protein. and i never tried this
A shopper on Sep 17, 2012
BEST ANSWER: After your workout is a recommended time of consumption according to the product supplemental facts. The other recommended times are for between meals and before bed.
i'm 20 years old 55kg which should i take weight gainers or whey protein?i'm under weight workout 5times a week..??
A shopper on Sep 12, 2012
BEST ANSWER: Since you are under weight and looking to gain muscle AND mass you should consume a weight gainer product like the Serious Mass powder. Once you have reached your desired weight or body size you can use whey protein to gain lean muscle and build strength and endurance.
hi...I am ashish,26yrs old. I have an average body having height 6'2 and weight around 79kgs. Actually I had this product(ON Serious MAss) 3 times continuously but what I have seen is when I stop taking it my body becomes so lean and skinny and Stamina is also decreased. So, I just want to know is this a right product for me or I should go for some better product?
Please suggest me.

A shopper on Sep 10, 2012
BEST ANSWER: It sounds like you are seeing results from this product, so you should continue taking it. The reason for your decrease in body mass while not taking this product is that when you stop using it, you are eliminating 1250 calories from your diet. Your body needs a certain number of calories to maintain any weight (higher weights needing more calories), when those calories are reduced your body will start cannibalizing fat and muscle tissue for fuel.
hi .i m 30 yeras old .my body type is average not skinny i have little bit fat on my body is this product is good for me.if not then what should i use for more muscle size but in good shape.plz help me and answer me
A shopper on Aug 26, 2012
BEST ANSWER: This product will definitely give you the additional calories and protein you'll need to put on extra body mass. Whether or not that extra mass will be more muscle or more fat will depend on your training regime.
is serious mass a pre-workout or post-workout? and at what other times can i take it ?
A shopper on Jun 21, 2012
BEST ANSWER: According to package directions, Serious Mass can be taken post workout, between meals and before bedtime.
Does this product contain a superficial amount of gluten or would it affect my health as a celiac diagnosed person ?
A shopper on Jun 12, 2012
BEST ANSWER: The product label says it contains glutamine peptides, glutamine peptides are sourced from wheat. If you are celiac diagnosed, I would recommend finding a product that doesn't contain wheat or wheat based derivatives just to be safe.
Hey, im 17 years old and i weigh 120lbs. Is it safe for me to take this becuase im under wight but I still workout 5 times a week. I just want to gain some fat on me. :)
A shopper on Mar 13, 2012
BEST ANSWER: Well, this will help you gain weight, but you may want to cut down on your workouts as well. Maybe you could consider 3 or 4 times a week instead of 5?