Optimum Nutrition Pro Gainer Review

Aside from eating a balanced diet and doing heavy training, taking mass gainers is one way to achieve serious mass faster.  

If you’re looking for mass gainers or a weight gain supplement that includes quality nutrition and will help you add lean muscle mass and increase strength, then you might have heard of the Optimum Nutrition Pro Gainer

In case you haven’t heard of it yet, Optimum Nutrition has been recognized as a well-known brand in the sports nutrition industry. The Pro Gainer is a mass gainer and whey protein powder packed with essential nutrients and vitamins such as carbs, fat, and high protein formula. 

This whey protein powder and mass gainer is suitable for those looking for a product that will help you gain serious mass faster. 

Not only that, the protein-calorie ratio will increase lean muscle growth and recovery and boost strength and size.

If you want to know more about the Optimum Nutrition Pro Gainer review, keep reading to know what makes it stand out from other weight gainers.

TLDR: Review of the Optimum Nutrition Pro Gainer

Product Description/Ingredients

The Optimum Nutrition Pro Gainer is a bulking high protein weight gainer that includes high calories, which helps consumers gain serious mass instantly. 

Each serving of 1.5 scoops consists of 85 grams of complex carbohydrates and 60 grams of protein, making a total of 650 calories. 

This whey protein powder ranges in various flavors such as cookies and cream, strawberry, banana cream, vanilla custard, and double chocolate.

The Optimum Nutrition Pro gainer comes in two sizes: a 5 lb bag and a 10 lb bag. The small one consists of only 14 servings while the large one includes 28 servings. Its main component is maltodextrin, a highly-processed starch that causes blood sugar levels to rise quickly. 

The Pro Gainer is also slightly similar to the Optimum Nutrition Serious Mass hard gainer which is the protein powder for ultimate muscle building and weight gain. However, the Optimum Nutrition Serious Mass gainer offers more caloric intake and tools such as amino acids that will support you in your goals to build lean mass and gain more weight. 

Carbs and fat

We all know that complex carbs play a big part in retaining all the essential minerals and protein in our bodies. Without carbs and fats, one cannot attain a good upper body shape. 

The Pro Gainer not only helps you gain serious mass, but also helps you keep your body sustained with high energy levels. 

The Optimum Nutrition Pro gainer does not include traces of trans fat, only 380 mg of Sodium and 80 mg of Cholesterol. 

To sum it all up, the carb content of the product is 85g, where total sugars include 7g (with 2g added sugar) and dietary fiber of 5g.

Medium Chain Triglycerides

Medium Chain Triglycerides or MCTs is a type of fatty acid with a unique chemical structure. Researchers have found that MCTs play a role in weight maintenance and create a substantial impact for very active individuals.

Proteins and Vitamins

One way to gain weight is to increase your protein intake. This whey protein powder includes proteins and essential minerals, such as whey protein isolate and whey protein concentrate which absorb the nutrients and smoothen the digestive system. 

The much essential iron and calcium caseinate boost bone strength and support lean muscle building. 

The Pro Gainer is packed with 60g of proteins per serving, which works as a premium enrichment powder. For fat gain or serious mass gains, the Pro Gainer also acts as a booster and assists you in your post workout recovery.

Other nutrients

Aside from the carbs, fats, and proteins, our bodies need various nutrients for lean muscle growth and strength. 

This protein blend consists of nutrients from eggs, milk, wheat, and soy. Some examples include hydrolyzed whey peptides, whey protein isolate, glutamine peptides, and many more. 

Optimum Nutrition offers you the energy levels you need to work out by giving you 32 beneficial vitamins and minerals that work with proteins and carbs. Other ingredients included in the Pro Gainer are egg albumen, high oleic sunflower oil, and acesulfame potassium.

Pros and Cons


Here are some of the claimed health benefits of the Pro Gainer:

  • Helps consumers gain more weight fast
  • Includes extra calories
  • Available in various flavors
  • Comes in two sizes (5 lb and 10 lb)
  • Contains maltodextrin, the product’s main ingredient
  • Includes carbs and fat, proteins and vitamins, and other micronutrients
  • Consists of whey protein isolate, whey protein concentrate, whey peptides, glutamine peptides, hydrolyzed whey peptides, and calcium caseinate


Here are some of the disadvantages of the Pro Gainer:

  • Costly
  • Has an unpleasant taste

Is it worth it?

Yes. The Optimum Nutrition Pro Gainer is worth a try. This protein blend is suitable for those looking for a faster and healthier way to gain fat. 

It is available in various flavors and ingredients such as carbs, fat, proteins, essential vitamins, and other micronutrients.

Want to learn more about the product? Check it out here!

In-Depth Review of the Optimum Nutrition Pro Gainer

Supplemental Facts

Here is a list of ingredients of the Pro Gainer:

FlavorsDouble Chocolate, Vanilla Custard
Best Way To TakeTake one heaping scoop with 16 fl. oz. of water, milk, or your favorite beverage.

How to Take the Optimum Nutrition Pro Gainer

Here are the directions on how to take the Optimum Nutrition Pro Gainer:

  1. Add one big scoop of about 16 oz of cold water and mix in a shaker cup for 45 to 60 seconds. Add ice and milk in a blender for a thicker texture. You can take it after a workout session or between eating a high-protein meal.
  2. For post-workout recovery, drink one serving after 30-60 minutes of a well-structured exercise program for maximum recovery. 
  3. For between meals, drink 1-2 servings to support a high-calorie diet.


Yes. Optimum Nutrition Pro Gainer offers a money-back guarantee, which you can take advantage of if you are having second thoughts on buying the product. In case you’re not satisfied with your purchase, they will process a refund or find you a solution. 

Safety Information

We encourage everyone to read the label first and consult with a medical professional before trying any nutritional products.

This supplement contains the main ingredient named maltodextrin, which is a highly processed starch that causes your blood sugar levels to rise. For individuals who suffer from high blood pressure or any cardiovascular diseases, this supplement may not be suitable for you.

In addition, this product also consists of complex carbohydrates, calories, proteins and vitamins, and other micronutrients that will help you gain weight.

Warnings: Do not exceed more than one big scoop, which is the recommended daily serving of the supplement. If you have any medical conditions, we suggest you consult a physician before drinking the protein powder to ensure safety. 

Hypoglycemics and diabetics should only use this product under the advice or permission of a licensed and qualified dietician or physician. This product is labeled to the United States standards and may differ from similar products sold elsewhere in its ingredients, labeling, and allergen warnings.

Legal Disclaimer

Statements made or products sold through the website have not been evaluated by the Food and Drug Administration (FDA). The products do not aim to prevent, treat, cure, or diagnose any diseases.  

The provided information is for informational purposes only and does not aim as a piece of alternative advice from your doctor. Any information found in any packaging or product label does not also intend as a substitute for medical advice.

Always consult with a medical professional such as a physician, dietician, or doctor before undergoing a diet, exercise program, or taking any supplements, or if you experience any allergies or problems. 

Who is it Best For?

The Optimum Nutrition Pro Gainer is best for individuals and fitness enthusiasts who are looking for a faster way to gain weight. 

Interested to buy? You can purchase it here! 

What Do People Say About it?

An Amazon customer named Christopher gave the product five out of five stars. He writes in the comments, “Optimum Nutrition Pro Gainer is one of my favorites. I recommend getting the vanilla flavor since it tastes good by itself, and it can be easily mixed with other things to change the flavor.” 

“I like to add cinnamon to my protein shakes, and it tastes so good. It is also packed full of vitamins and minerals that your body needs. It is an all-in-one bundle with plenty of protein, carbs, fats, vitamins, and minerals.”

However, an anonymous customer was not satisfied with the product and gave it three out of five stars and warned future consumers that it contains “toxic heavy metals.” “I have tried three flavors of this stuff. 

While they were all tasty, I will not be purchasing again due to its low score on Clean Label Project’s tests for toxic heavy metals. I just discovered this, and it is frightening to see how many products in this category tested badly.”

Brian from The PT Channel filmed a video reviewing the Optimum Nutrition Pro Gainer on YouTube. “It’s not too bad. It mixes well with water, not with milk myself. But you’re getting a bunch of stuff in there from Vitamin A through iodine, zinc, calcium, and down to some calories.”

He recommends it to people who can afford the product, which costs $70 for a 10 lb bag. One scoop of the whey protein powder gives you 60 grams of protein. 

Interested to buy? You can purchase it here! 

The Verdict: Should You Try It?

If you’re looking for the best mass gainer that will help you gain more weight fast, you might want to check out Optimum Nutrition Pro Gainer. 

This mass gaining supplement and protein blend help not only help healthy adults with gaining more weight but also build muscle growth and strengthen serious lean mass. 

We highly recommend you to try the Optimum Nutrition Pro Gainer! 

This mass-gaining supplement consists of essential nutrients and vitamins such as pantothenic acid, glutamine peptides, calcium caseinate. It also includes carbs and fats, ample supplemental protein, and other micronutrients. 

Lastly, it has a key ingredient named maltodextrin, a highly-processed starch that causes blood sugar levels to rise quickly. To achieve the best results, take this supplement while eating high-quality foods and doing a regular exercise program.

If you like this article, you might want to read our other reviews at ExpertFitness.org.