Optimum Nutrition Serious Mass Reviews

Loaded with 1,250 Calories, 250g of Carbs, & 25 Vitamins and Minerals to Pack on Pounds*

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Overall Rating
8.4
Out of 10
Good
1054 Total Ratings
Verified Buyer Rating:
8.6
398 Verified Buyer Ratings
Average Taste Rating:
7.8
View Flavor Ratings
6.6
Strawberry
- -
Cookies and Cream
8.9
Chocolate Peanut Butter
- -
Vanilla
8.2
Chocolate
7.5
Banana
7.6
Vanilla
1-20 of 1,054 Reviews

willykevin0607's Rating
8/10
Cookies and Cream
3/10

Ok so I've been on this product for a while and it's helped me gained at least 10lbs. Ive always gotten chocolate peanut butter, and the chocolate one. I purchased the cookies and cream one... man to me it's a really bad flavor. Doesn't even taste like cookies and cream. I recommend this product just not this flavor! I wonder if I can do an exhange



PabloLiftabar's Rating
9/10
Vanilla
10/10

Detailed, long, and honest review for potential buyers: This is great for skinny guys looking to gain weight. Using this, as well as eating more food in general I went from 140 - 155 in less than a month of using it daily. It has to be mentioned that a fair bit of that is in fat, not lean muscle, but hey all things considered not bad. The recommended serving size of "two HEAPING scoops" is pretty dumb. One, the scoop is buried like sunken treasure in the bag, making it almost impossible to get out with the risk of wasting powder since this powder in particular is very sticky. Sticks to hands easily, the scoop, etc. Not a con, but makes you wonder why it may be sticky sometimes opposed to their regular gold standard Whey. So, instead of doing that I use my other scoop from the regular GS Whey from ON, with an average of 3 scoops. I'm estimating that's about half of the 1250 potential calories, coming to about 600 - 700 calories per shake, especially when using milk instead of water. Overall, really good for a weight gainer, at times a bit chunky, but if that affects you your a *****. Just chug it.



AliParsii's Rating
10/10
Chocolate Peanut Butter
10/10

Have been taking this for almost 2 months and seen amazing results so far. Chocolate peanut butter tastes so good(I recommend it). As far as gains go I have gained around 8lbs since I started taking it. Overall great product and it's better to have it with milk than with water.



jkillinger's Rating
9/10
Chocolate
10/10
Cookies and Cream
7/10

The chocolate is a tried and true tasty protein. The cookies and cream tastes great with milk, not very good with water. And the protein itself smells absolutely terrible before you mix it up.



Bosmer's Rating
9/10
Banana
5/10

Bosmer did not leave a written review for this product.



Dlew101's Rating
10/10
Vanilla
10/10

I am almost done with my first bag, I chose vanilla and gave it a 10 because you can change the flavor of vanilla, me personally I like to throw in 2 scoops of peanut butter 1 whole milk and one chocolate milk into the blender takes care of the not mixing well part, sometimes I mix with coffee or orange juice, vanilla has endless possibilities. I was taking 1 to 2 scoops a day and did a 4 week run working out 5 days a week and I put on 12 pounds, seen 180lbs on the scale for the first time in my life. Got home after a month and girlfriend for the first time made the comment how good and muscular I looked, now I'm buying multiple bags...my only negative review is I did really have to watch my gut, but hey I guess that's part of gaining weight and bulking.



ekapishon's Rating
9/10
Chocolate
9/10

If you are consistent, you will gain weight. At first it seems it's a little upsetting on the stomach, as it is not used to the amount of liquid calories you throw at it, but with time you will adapt to the routine and start gaining that magical mass. Drink one scoop in the morning with breakfast and drink another one hour before bed. And ofc don't forget to eat your regular meals. From 154lb I went up to 170lb in the matter of 2 months and I am just on my second bag.



joongwon's Rating
3/10
Chocolate
1/10
Chocolate Peanut Butter
8/10

Started out with the Chocolate Peanut Butter. Good flavor but results were slim to none. Decided to give it another chance and picked up Chocolate recently. Not sure if the formula changed but the shake became a lot more foamy and caused me to throw up the past 2 times I took it......not to mention, it tastes like dirt and asphalt.



Harorider96's Rating
9/10
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I've been taking these shakes for a few months now and have gained 20 pounds since October. I weighed 148 pounds in October and now I weigh 169 pounds. The chocolate and vanilla flavors are pretty good, the chocolate peanut butter flavor is good too, but I prefer the chocolate the best. The best way I have found to make these shakes is as follows. 24 oz whole milk, 2 heaping scoops of chocolate powder, 1 banana, 1/2 cup of oats. Blend thoroughly. 1980 calories and it tastes good!



Zevixius's Rating
10/10
Banana
9/10

An absolutely brilliant mass gainer, the flavours are far superior to other supplements I have used in the past. I would recommend this product to anyone looking to gain some "serious mass" and quick. Bodybuilding.com never fail to impress with their fast delivery, quality and overall service.



mikecochran31's Rating
9/10
Chocolate Peanut Butter
10/10
Vanilla
7/10

The taste is great. I gave Vanilla a 7 because after mixing, half is turned to froth. I have asked a few friends that have used this and they said it was only the vanilla for them as well. Other than the frothiness of vanilla, this is a pretty rad product in my opinion



Slyguy1500's Rating
10/10
Cookies and Cream
10/10

The absolute best mass gainer! The only gainer around where you get over 1,200 calories WITHOUT WASTING THE PROTEIN! Your body can only take in 50 grams of protein per setting, and that's exactly what the serving limits it to! Been taking it for 5 years now and it by far works the best, excellent for getting a quick thousand+ calories in when you are on the go without wasting any protein. Just bought the new flavor Cookies and Cream and it literally tasted like Cookies and Cream ice cream! Amazingly Delicious!



Gigliotti2123's Rating
10/10
Banana
10/10

Gigliotti2123 did not leave a written review for this product.



brucejrfsu's Rating
5/10
Chocolate Peanut Butter
8/10

Chocolate Peanut Butter taste good, but the scoops are too big and too hard to mix unless you use a huge cup. I won't order again.



Danmar45's Rating
1/10
Chocolate Peanut Butter
10/10

Bought waited over a week cannot get through to the company at all zero communication from body building only luck was got a refund due to PayPal love the product would just buy from else where!



GordonRW's Rating
1/10
Chocolate
1/10

easily the worst taste i have ever had in my mouth. You also need 2 cups of protein for the required serving. there are better gainers out there, and MUCH better tasting ones.



abdullahi143's Rating
9/10
Strawberry
8/10

tastes so nice and yeah



Alimz1996's Rating
9/10
Chocolate
8/10

Alimz1996 did not leave a written review for this product.



cgraves21's Rating
10/10
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Awesome product! The serious mass got me interested in the ON line up! They are based in the USA and one of the few companies that actually make sure you are getting what the bag or bottle says! This product has a huge amount of carbs which is great for me because i am trying to gain weight(muscle mass). Recommend for people that are trying to gain weight to add to their regular meals throughout the day. 1scoop per serving twice a day in between meals! GAINS BABY!!!



mcochran907's Rating
10/10

Best mass gainer available. Optimal amounts and ratios for very hard gainers. I have struggled for a very long time with a 5-6000 calorie per day diet and supplements, and finally with this particular mass gainer I have seen serious results. I divide the portion by two, and take one upon rising and one before sleep. Along with a great routine and nutrition, this mass gainer has helped me achieve my weight goal. The peanut butter flavor is by far the best. Definitely 10 stars.


1-20 of 1,054 Reviews