Pro Gainer vs. Serious Mass (What Is The Best Weight Gainer?)

Pro Gainer vs. Serious Mass

What if I say that Optimum Nutrition is a company that manufactures the best supplements? Wouldn’t I be stating the obvious? But what’s not that obvious is the distinction between Pro Gainer vs. Serious Mass. The two most effective weight gainer supplements produced by the company!

Both options are packed with simple proteins and carbohydrates. Along with minerals and vitamins of course! But that doesn’t mean they are identical or target the same goals. As a matter of fact, Pro Gainer and Serious Mass are different supplements. That focus on achieving specific goals.

So how about we find out everything there is to know. About these two Optimum Nutrition powerhouses!


Our Rating

Protein Per Serving

Carbohydrates Per Serving

Calories Per Serving


60 grams

85 grams



50 grams

250 grams


Optimum Nutrition Pro Gainer Weight Gainer Protein Powder

Optimum Nutrition Pro Gainer Weight Gainer Protein Powder

Optimum Nutrition Serious Mass Weight Gainer Protein Powder

Optimum Nutrition Serious Mass Weight Gainer Protein Powder


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Let’s start with the Optimum Nutrition Pro Gainer Weight Gainer Protein Powder. It is considered to be a lean gainer formula. In that sense, the Pro Gainer contains an equal content of protein and carbohydrates. (Difference between weight gainer and protein powder)

Now it’s time for me to get into the specifics. 

So every 165g serving provides your body with 85g carbohydrates. The form of carbohydrates here is maltodextrin. As for blended protein, that’s about 60 grams. Such a combination consists of glutamine peptides and hydrolyzed whey. The former is useful for muscle building. And the latter has quick absorbent properties. There’s also whey isolate present in here.

On the other hand, the egg albumen and sodium caseinate protein get absorbed slower.

You’ll also find a healthy blend of minerals and vitamins. Along with hearty digestive enzymes and lipids!

Now, what about the Optimum Nutrition Serious Mass Weight Gainer Protein Powder?

This one is considered to be a hard gainer supplement. A serving of 334g offers 250g carbohydrates and 50g protein. So there’s a significant difference in the ratio of carbohydrates to protein. Despite that, both formulas are quite similar.

Serious Mass also contains maltodextrin-based carbohydrates and the same protein blend. That means egg albumen, whey concentrate, and calcium caseinate are in here too. But don’t expect Pro Gainer’s faster-acting whey fractions in this case. That doesn’t happen with Serious Mass.

Here’s another difference. Serious Mass consists of smaller amounts of creatine and glutamine. Basically, these are amino acids that help build muscles. The supplement also has minimal fat and no digestive enzymes.

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Pro Gainer vs. Serious Mass: Which Is Better?


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It goes without saying that the Optimum Nutrition Pro Gainer offers numerous benefits. The complex formula contains BCAAs and glutamine. And both contribute a great deal to faster recovery. In the case of fitness enthusiasts as well as athletes!

The blend of calories, protein, and carbohydrates ensures one thing. That you get to make the most of every workout session! While also minimizing or eliminating downtime! So you can perform the same way at the next session.

What does this tell you? In simpler words, that means your body doesn’t feel sore due to your previous day’s physical training. Such effects get reduced drastically.

The best part about Pro Gainer is that you can consume it as a replacement for your protein meal. Or in the form of a shake post-workout!

Time to move on to the Optimum Nutrition Serious Mass Weight Gainer Protein Powder. As the name suggests, the supplement has mass gainer properties in every aspect. After all, the higher caloric protein formula explains it all, doesn’t it?

If what you wish to do is bulk up, then this is the perfect Optimum Nutrition product for you. The supplement adds more calories to the daily diet. Every Serious Mass Gainer review tells you that!

Pro Gainer vs. Serious Mass: Comparing Ingredients


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Let me tell you that Serious Mass and Pro Gainer are made up of similar ingredients. This includes the protein blend along with the level of protein each serving. Even the minerals and vitamins are not any different. But that’s about it though. The similarities end there.

The Optimum Nutrition Pro Gainer Weight Gainer Protein Powder is a better option. That’s because the formula is packed with superior protein for building lean muscles. Instead of just additional calories that only produce mass.

The manufacturer has also added glutamine and BCAAs to the mix. These elements make the supplement more appealing and better.

To the contrary, the Optimum Nutrition Serious Mass Protein Powder houses excessive calories. Your stomach is likely to find this formula more physically demanding. So the chances of bloating are quite enormous. Don’t expect every Pro Gainer review to be so upfront about this.

Pro Gainer vs. Serious Mass: Comparing Dosage


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Both Pro Gainer and Serious Mass live up to your expectations. In terms of targeting specific goals! The serving of the former is 165g while the latter is 334g.

At this point, I would like to state an important truth. That avoiding big servings is not easy when such well-formulated blends are a part of the diet.

So the best thing to do is to break down these doses. Into 2 or 4 servings spread across the entire day. Instead of consuming it all in just a single sitting! Such a practice encourages the habit of consuming high calories for weight gain.

Pro Gainer vs. Serious Mass: Side Effects


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If you’re a healthy adult who wants to use either Pro Gainer or Serious Mass, I don’t see any reason to suggest otherwise. But if you’re allergic to eggs, wheat, soy, or milk, then I wouldn’t say the same thing. Such food allergies do give rise to harmful effects. So it’s best to avoid the consumption of these supplements.

Another important thing to note here is that instructions are provided for a reason. And when you don’t follow them properly, they can cause bloating and stomachaches. This happens due to your body’s inability to break down all the extra protein. So you need to make it a point to use the formula in conjunction with a stable exercise routine.

With that in place, both Optimum Nutrition products are suitable for athletes. Along with fitness professionals and lifters!


I wouldn’t say that it’s difficult to state which one is more superior. As already mentioned, Optimum Nutrition Pro Gainer Weight Gainer Protein Powder is better. And why is that? Cause the formula is equipped with higher average protein. Along with calories that help in making your muscles leaner. Not just bigger.

Pro Gainer contains BCAAs and digestive enzymes as well. Unlike the Optimum Nutrition Serious Mass Weight Gainer Protein Powder. That means it scores extra points in terms of ingredients too.

So what do you think, have I made myself clear? Can you make a better decision? Now that you know what the differences and similarities are!

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