Pro Gainer Vs. Serious Mass – Compared in Details

When it comes time to bulk up and you aren’t seeing the results you want from all those grueling hours you put it in at the gym, it may be time to consider adding a protein supplement to your daily regimen. Optimal Nutrition is one of the most widely used protein supplements on the market for those seriously looking to put on size.

Pro Gainer vs Serious Mass

The company has a myriad of protein supplements to choose from, but this article will focus primarily on their Pro Gainer and Serious Mass Products (get serious mass on amazon here and pro gainer on amazon here). Both contain powerful combinations of protein and carbohydrates to assist you in adding some serious mass to your frame.

The Power of Protein
Our bodies require a certain amount of protein to aid in the building, repair, and maintenance of muscle tissue. However, when you desire to build, rather than maintain, muscle the body requires an even higher amount of protein. It is explained on that if you don’t fuel your body with the appropriate amount of protein then your body can start to break down muscle tissue to satisfy its protein needs.

Yet protein is not the only nutrient that your body needs to build muscle. Carbohydrates play a vital role in providing your body with energy to power through your workouts. The key is to consume complex carbohydrates instead of simple carbohydrates, that are filled with sugar.

But how do you know how much protein and how many carbs you should consume each day to pack on the muscle mass? To achieve muscle growth most experts recommend that you take in one to one and a half grams of protein for every pound. Carbohydrates can be a bit trickier. To increase mass you would typically need to consume two to three grams of carbohydrates per pound. This drops down to one and a half grams per pound for those who have a high percentage of body fat.

Following this formula an individual who weighs 220 pounds and is 20% body fat should consume between 220 and 330 grams of protein per day, and between 440 and 660 grams of carbs per day. An individual weighing 220 pounds who is 35% body fat should still take in between 220 and 330 grams of protein per day, but should reduce their carb intake to 330 grams per day since they have a high percentage of body fat.

If you need help figuring out the amount of proteins, carbs, and fat you should take in each day you can use a macronutrient calculator. This tool calculates how many grams of each nutrient your body will require to either maintain your weight, lose weight, or build muscle. It will ask you for your sex, age, height, weight, and activity level to arrive at these results.

Choosing a Protein Powder

Optimal Nutrition Pro Gainer

This protein powder (which, more correctly is a weight gainer – read more on the differences here) is designed to be used as a high-protein “snack” between meals and as a post-workout recovery shake. You will find that this supplement contains 650 calories, 85 grams of carbohydrates, minimal sugar, and 60 grams of protein. These work together to help restore energy levels after an intense workout. This whey formula is available in 4 different tasty flavors: double rich chocolate, banana cream pie, strawberry cream, and vanilla custard.

Optimal Nutrition Serious Mass

Serious Mass is a serious contender amongst best weight gain formulas. This after-workout and between meal protein shake will surely help you to bulk up with the 1,250 calories it holds in each serving. It also contains 50 grams of whey protein, more than 250 grams of carbs, 25 essential vitamins and minerals, creatine, glutamine, glutamic acid, and has no added sugar! Choose between 5 different delicious flavors: chocolate, chocolate peanut butter, strawberry, banana, or vanilla.

The Best Value

When shopping for protein shakes online, it can be hard to know which company to purchase through. Amazon is almost always the cheapest unless one of the other online retailers happens to be having a sale. Below you’ll find a list of current price comparisons for each product listed on Optimal Nutrition’s website, as well as on,, and

Optimum Nutrition Pro Gainer

Optimum Nutrition:

  • $137.49 for a 10 pound container, currently on sale for $69.99.


  • $43.89 for a 5 pound container.
  • $77.29 for a 10 pound container.

  • $39.99 for a 5 pound container.
  • $74.99 for a 10 p;ound container.


  • $41.49 for a 5 pound bag.
  • $71.99 for a 10 pound bag.

Optimum Nutrition Serious Mass

Optimum Nutrition

  • $51.99 for a 6 pound container, currently on sale for $27.99.
  • $87.49 for a 12 pound container, currenly on sale for $45.99.


  • $29.09 for a 6 pound container.
  • $48.99 for a 12 pound container.

  • $33.99 for a 6 pound bag.
  • $48.99 for a 12 pound bag.


  • $27.48 for a 6 pound bag.
  • $47.98 for a 12 pound bag.

Nutritional Information and Active Ingredients

Curious as to what exactly it is that you will gain from choosing one of these protein supplements by Optimum Nutrition? Below is a sampling of ingredients found in each that will help you power through your workouts and ensure that you are packing on the muscle. Check out Optimum Nutrition’s website for an exhaustive list of ingredients in Pro Gainer and in Serious Mass.

Optimum Nutrition Pro Gainer

Optimum Nutrition’s Pro Gainer protein blend contains whey protein, a lipid blend, and a vitamin/mineral blend. This combination delivers a large amount of the vitamins, minerals, and nutrients that your body needs during bulking season. After taking one serving of the Pro Gainer protein shake you will have consumed:

  • 12% of the daily value for fat
  • 28% of the carbs
  • 120% of the protein
  • 50% of the calcium
  • 35% of the Vitamin E and C, riboflavin, maganese, and phosphorous
  • 45% of the iodine

That’s an astounding amount of good stuff in just one scoop!

Optimum Nutrition Serious Mass

Serious Mass has an even more powerful whey protein blend that delivers 100% or more of the daily value of several different vitamins, minerals, and nutrients including:

  • 100% of protein
  • 100% of Vitamin A, C, and E
  • 320% of thiamin
  • 235% of riboflavin
  • 250% of niacin
  • 250% of Vitamin B6
  • 100% of folic acid
  • 167% of Vitamin B12
  • 100% of biotin
  • 250% of pantotheric acid
  • 100% of iodine
  • 100% of zinc
  • 100% selenium
  • 100% maganese
  • 100% chromium
  • 100% molybdenum

Proper Dosage

Optimum Nutrition Pro Gainer

The proper serving size of Pro Gainer is one heaping scoop, to be used as a snack between meals and/or as a post-workout shake.

Optimum Nutrition Serious Mass

You should use two heaping scoops of Serious Mass to make your protein shake. You can drink this shake in replacement of a snack between meals and/or as a post-workout supplement.

What the Customers are Saying

When choosing any new supplement it’s important to do your research. You want to know about any side effects and also how successful other users have found the product to be so that you don’t waste your money.

Optimum Nutrition Pro Gainer

  • Consumers rave that the Pro Gainer powder dissolves easily whether you’re mixing it with water or with milk, without leaving any clumps. As you may know, this can be hard to find in a protein shake.
  • This protein shake is known for its awesome taste, compared to other protein shakes. Many users claim that it tastes just like a milkshake, especially when you choose the double chocolate version.
  • Because there are 7 different sources of protein used in this product your body will metabolize it over several hours, instead of all at once!
  • This protein powder is one of the few options out there that won’t leave you feeling heavy or bloated after drinking it. There’s also no unpleasant gas to deal with afterward.
  • In comparison to competitors, Pro Gainer has low sodium and cholesterol.
  • It’s an awesome value at around $2.25 per serving.
  • Be wary when using this product that the serving size is off. Instead of using one heaping scoop full, use about a scoop and a half.

Optimum Nutrition Serious Mass

  • One consumer raved that after using this product for only three months they were able to put on 25 pounds! Many claim to see between a 15 and 30 pound increase in this same span of time, or shorter.
  • It’s best to use a blender with this powder because it is so thick. It is likely to end up being a chunky consistency if you just use your shaker cup to mix it.
  • Some users recommend combining the chocolate and vanilla powders for an excellent tasting shake.
  • This is an excellent product for those who are underweight or really struggle with putting weight on. But be prepared to work out a great deal so that you will actually put on muscle, and not just fat.
  • Just as the serving size is off for the Pro Gainer, the same holds true for Serious Mass. Except it’s in reverse. Users complain that it is impossible to consume two heaping scoop fulls of this product in one sitting and that using one scoop or a scoop and a half is much more feasible.
  • Because of the amount of stuff packed into this powder, it is known to cause both bloating and gas.

Other Products

Optimum Nutrition is a phenomenal brand with excellent reviews. Yet, maybe you have decided that neither Pro Gainer or Serious Mass is not a good fit for you. Perhaps you’re looking for a happy medium, or something that doesn’t contain whey. Not to worry, Optimum Nutrition has several other protein supplements that are available. Here are just a few.

Gold Standard

This protein powder is comprised of 100% whey protein. It provides 24 grams of protein, 5.5 grams of BCAAS, and 4 grams of Glutamine and Glutamic Acid.

Essential Amino Energy

This powder is designed for strength and recovery. Each serving has 5 grams of amino acids, 100 mg of caffeine, and no sugar!

Gold Standard Pre-Workout

Here’s another popular strength and recovery shake. This protein powder carries a whopping 175 mg of caffeine, 1.5 grams of beta-alanine, and 3 grams of creatine monohydrate in every serving.