Home > Categories > Protein > Weight Gainers > Optimum > Serious Mass

Serious Mass

By Optimum
Serious Mass Optimum
Overall Score:
(Weighted average based on 73 Reviews)

Submit a review

Serious Mass ranks #5 of 30 in (Protein > Weight Gainers) and is rated better than 86% of all products in this category.


Trust: 100%

shinndigg's Serious Mass Review

Overall: 8 | Effectiveness: 8 | Value: 7

Throughout my bulk the past several months I have taken several different mass gainers to help aid in my daily caloric intake. Serious Mass is a product that you can tell is driven towards that objective. Optimum Nutrition is one of my favorite supplement companies out there, I have hardly ever been...


Trust: 100%

jgn2112's Serious Mass Review

Overall: 8 | Effectiveness: 10 | Value: 7

If you're reading this, there's a good chance you're comparing ON Serious MASS to ON Pro Complex Gainer. Before I get into the meat of this review, let me just say right up front that I've gone through about 3 10lb and 12lb containers of each and, at the end of the day, IN GENERAL, I consider ON PC...


Trust: 0%

If you are dedicated to gaining weight, this supplement WILL help you

Overall: 9 | Effectiveness: 9 | Value: 9

Okay. If you are dedicated to gaining weight, this supplement WILL help you. No supplements will make you gain 20 lbs of muscle in a week as you sit on your couch staring into space all day. If you want to gain weight, more specifically muscle, then get to the damn gym, eat protein like your life depends...

Trust: 100%

Mattmac1017's Serious Mass Review

Overall: 9 | Effectiveness: 9 | Value: 10

I have gone through 2 12lb bags of this, and I am very satisfied with the results I saw each time.

Price: (10) I got both of my bags for $29.99, which comes out to less than $2 a shake with each bag containing 16 full servings. This is one of the high points for Serious Mass. 250g Carbs, 50g Protein,...


Trust: 100%

Dfost115's Serious Mass Review

Overall: 6 | Effectiveness: 7 | Value: 6

I bought this as my first weight gain supplement when i found out that, as an xc runner and lifter, i was deep in calorie deficit every day. I decided on serious MASS because it had the most calories per serving. I have also used Ultimate's musxle juice 2600 which is what i will compare this product...

Trust: 0%

I found that all of the flavors were excellent

Overall: 7 | Effectiveness: 8 | Value: 10

I was taking this exclusively when I was at my biggest. The best part was it was mostly clean weight. I found that all of the flavors were excellent (at least I think they were) and for the price it's the best gainer out there.
I will however offer the following advice. Start with one scoop, not two....


Trust: 53%

I3CAA's Serious Mass Review

Overall: 9 | Effectiveness: 9 | Value: 8

Optimum Nutrition's Serious Mass. The Weight Gainer for hardgainers.

Serious Mass Claims/Ingredients:

*1,250 calories per serving in water; 1,630 calories when made with low fat milk.
*50 Grams of protein from a combination of faster and slower digesting sources including Whey, casein, and Egg.

Trust: 0%

Adam09's Serious Mass Review

Overall: 8 | Effectiveness: 9 | Value: 7

First review on this site and i'm glad it's about Serious Mass. I started weightlifting the end of august and weighed about 145 lbs. I realized that if i wanted to put on serious muscle i would need to take in a large amount of calories; more than i've ever been used to eating. This is where Serious...

Trust: 0%

ManosdePiedr's Serious Mass Review

Overall: 10 | Effectiveness: 10 | Value: 10

Results - To give some context, I am 5'10" and I weighed exactly 126lbs when I started using this supplement. I weighed myself at the same time of day naked. I've been using this for 2 weeks, I've already put on 10lbs. This thing just works, plain and simple. If you struggle to eat enough, have a poor...


Trust: 0%

Baard's Serious Mass Review

Overall: 9 | Effectiveness: 9 | Value: 6

Like many others, I have a hard time gaining weight. This has been a helpful supplement so far!

EFFECTS (9/10)
Effects came pretty fast, and even though most of my daily servings were only half doseage, I gained around 4 kg's. Personally I didn't experience any major fat gains, but I got more "filled...