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Optimum Nutrition Serious Mass Review

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Last updated on December 8, 2025


In this article, I am going to show you my results with taking Optimum Nutrition Serious Mass and I am going to back up this review article with a story on how people saw visible changes in my body.

First and foremost, I know I reviewed Gold Standard Gainer, which you can check out under reviews. However, there are differences which I’ll get to later in this article.

Optimum nutrition is often used by fitness enthusiasts, bodybuilders, athletes, even personal trainers like me that recommend it. However, I’ll get to the cons a little later.

Optimum Nutrition's Serious Mass provides you with the tools you need to support your high-calorie weight gain formula. You need whey protein if you aren’t a vegetarian. This can also replace a daily snack routine to support muscle growth.

Introduction to Serious Mass

When it comes to achieving your weight gain goals, finding the right supplement can make all the difference. Achieving a calorie surplus is crucial for effective weight gain, and Serious Mass provides the necessary calories to help you reach that goal.

Enter Serious Mass, a high-calorie weight gain formula designed to support muscle growth and recovery. Whether you’re a seasoned lifter or just starting your fitness journey, Serious Mass provides the essential nutrients you need to gain weight and build muscle mass effectively.

Product Overview

Optimum Nutrition Serious Mass is a powerhouse weight gainer protein powder designed to support your muscle building and weight gain goals. This supplement is packed with a substantial calorie intake, making it an ideal choice for those looking to increase their muscle mass. 

With its unique blend of whey protein concentrate, maltodextrin, and other essential nutrients, Serious Mass helps fuel intense workouts and supports muscle recovery. Whether you’re a seasoned athlete or just starting your fitness journey, Optimum Nutrition’s Serious Mass provides the nutritional support you need to achieve your weight gain goals.

What is Serious Mass?

Serious Mass is not just any weight gainer protein powder; it's a premium formula crafted to deliver substantial calories, protein, and carbohydrates. This powerful blend includes whey protein concentrate, casein protein, and egg protein, ensuring a sustained release of amino acids to fuel your muscles throughout the day. 

With Serious Mass, you're not just consuming calories; you're providing your body with the ultimate muscle-building nutrients to help you achieve your weight gain goals.

How to Start Out Using This Mass Gainer Protein Powder

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New users should start with a 1-scoop half serving. Use post-workout and/or between meals to add calories, carbs and protein to your healthy, balanced diet.

You are getting Vitamins & Essential Minerals with an emphasis on B-Vitamins Antioxidants so you will feel energized after taking this mass gainer protein powder. You will absolutely achieve your weight gain goals with this muscle building supplement.

I know that this company is a big name in the fitness field. Some people love it. Some people don't due to the prices. I'll get to that later. All I will say is you will gain serious mass taking this supplement. Always check with a qualified healthcare professional for new users.

Why I Chose to Review Optimum Nutrition Serious Mass

In case you didn't know, the supplement industry is filled with horrible whey protein with very good marketing. When you actually read the ingredients, you realize that you are consuming milk with pea protein.

I'm looking at you MRE. There are plenty of shitty brands out there you need to watch out for. Do not choose the brands that overload it with fillers. The whole purpose for this article is to tell you the reader...

I've been training for 8 years. The only protein I noticed that my body can handle the best is ON. 

That of course means Optimum Nutrition and of course the top 3 supplements I recommend on my blog.

UPDATE TO THIS ARTICLE: My rating has changed. This has hidden ingredients that brings it down more points than when I first tried it. Serious mass comes with digestive issues. But lets start out with the positives...

A Quick Story on When I Was Taking Optimum Nutrition Serious Mass

A few days ago I saw this younger dude, he walked up and told me... "Bro your chest is SHREDDED. What do you do for physical activity?"

I said to him straight up... "Lifting weights brother. I also take plenty of supplements." And then I left my shift that day. Not to mention I force myself to complete very intense workouts.

So here's what I did, I decided to weigh myself and I gained 3.5 full inches in my chest and back. This is why I chose to review this product. I did not measure my shoulders but it shows in this picture below. You can see weight gain for yourself.

Optimum Nutrition Serious Mass Results

Left is 143 September 2023           Right is 150 December 2023 

Full transparency, I neglected abdominal work. I started doing more abdominal work throughout along with the weight training program I'm creating. I always like to keep it real on my progress with fitness supplements I take.

You can't deny these results. I worked really hard to bring my body fat down. Last but not least, understand that I'm not perfect in my nutrition.

I'll admit to all my readers that I make Avocado Brownies. And it's really fucking good. I don't eat it all the time. But when I do, I make sure to knock out 100 burpees after I eat that delicious dessert.

How This Supplement Helps with Weight Gain

I have been struggling to gain some weight, as everyone knows, I have a lean physique. Even with upping my daily calorie intake and using other supplements such as GSC Gold Standard, I honestly didn't gain too much weight, I got more shredded instead.

I started using the Optimum Nutrition Serious Mass to make shakes and began to gain weight. I have gained 8 pounds in six weeks. That is a lot for someone who has not been able to gain.

The chocolate flavor tastes very good and it is not gritty like a lot of shakes. If you are struggling with gaining mass, I highly recommend this mass gainer.

It's time to stop thinking small; get serious – Serious Mass. 1,250 calories per serving in water; 1,630-plus calories when made with low fat milk. I'll give you a better alternative if you can't handle dairy later.

50 grams of protein from a combination of faster and slower digesting sources including Whey, Casein, and Egg. 250-plus grams of carbohydrates to support fueling of intense workouts, and aid in the replenishment of glycogen stores - with NO ADDED SUGAR.

Serious Mass is a substantial weight-gain supplement that can be used to feed serious calorie needs in a variety of different ways.

Who Should Use Optimum Nutrition Serious Mass

Optimum Nutrition Serious Mass is perfect for individuals aiming to gain weight or muscle mass. This includes athletes who need a high-calorie supplement to support their recovery needs and those who struggle to consume enough calories through whole foods alone. 

If you have a high metabolism or a weaker appetite, Serious Mass can help you meet your caloric intake requirements. However, it’s important to note that this product may not be suitable for those sensitive to high-carb or high-calorie diets. Always consult with a healthcare professional to ensure it aligns with your dietary needs.

Also please read my other article on digestive issues with this supplement. Although I am not hating on Optimum Nutrition... this can cause major bloating. 

How to Take Optimum Nutrition Serious Mass Throughout The Day

For many aspiring to be bigger, highly-active metabolisms, weaker appetites, and on-the-run lifestyles make consuming sufficient calories through whole foods alone a real challenge.

Serious Mass protein powder is the ultimate muscle building and weight gain formula Each serving contains 1,260 calories, 50 grams of protein and 253 grams of carbohydrates to support muscle recovery and help fuel workouts.

Instructions for Use

Using Serious Mass is straightforward and convenient. To prepare your shake, mix 2 scoops of the powder with 24 fluid ounces of cold water or low-fat milk in a blender. For an extra calorie boost, feel free to add fruits, peanut butter, or other calorie-contributing foods. If you're new to Serious Mass, start with a 1-scoop half serving and gradually increase to 1 or more full servings several times a day.

For optimal results, consume Serious Mass post-workout and/or between meals to maintain a positive nitrogen balance and support a high-calorie diet. Here's how to take this throughout the day and evening:

How to Drink Serious Mass Through the Day

BETWEEN MEALS: Drink ½ -1 serving of Serious Mass between meals to maintain positive nitrogen balance and support a high-calorie diet.

POST-WORKOUT: Begin drinking ½ -1 serving of Serious Mass 30-45 minutes following exercise to support maximum recovery

How to Drink Serious Mass Before Sleeping

BEFORE BED: Drink ½ -1 serving of Serious Mass about 45-60 minutes before bed to provide nutrients to recovering muscle throughout the night. NOTE: For best results use Serious Mass combined with intense weight training (3-5 times per week) and a sensible whole foods diet.

This is how I would take this mass gainer protein powder. Serious weight gain requires serious calories. However, those who need the extra calories most, often have the toughest time consuming enough of them. So let's get to the nutrition of serious mass protein powder. You will 110% see weight gain.

This fills you up extremely FAST. Leads to my number one con with this product. I do not encourage two scoops for the average person taking this for the first time. I encourage one scoop.

I learned this through just being a tad bloated. For that reason, this is rated a 8 out of 10. More on this rating a little later. I gave GSG which is short for gold standard gainer a 9 out of 10. 

Meaning I do prefer gold standard gainer in terms of ZERO stomach problems. Optimum Nutrition Serious Mass is more for seasoned lifters as well.

Some of the vitamins, minerals, and amino acids in this are the following: Magnesium Aspartate, Di-calcium Phosphate, D-calcium Pantothenate, Calcium Citrate, Manganese Amino Acids Chelate, Zinc Citrate, Ascorbic Acid, Niacinamide, Biotin, Beta Carotene, Selenomethionine, Molybdenum Amino Acid Chelate, Copper Gluconate, Thiamin Mononitrate, Riboflavin, Folic Acid etc.

In case you don't know what Molybdenum Amino Acid Chelate really is, here's what this amino acid can do for you. It is a supplement that combines Molybdenum with amino acids which is the building blocks of protein.

Key Ingredients and Nutrition Facts

Serious Mass is packed with a blend of key ingredients that are essential for muscle growth and recovery. Here’s a closer look at what makes this weight gainer protein powder so effective:

  • Whey Protein Concentrate: A high-quality protein source that supports muscle growth and repair. Whey protein is known for its fast absorption, making it perfect for post-workout recovery.

  • Molybdenum Amino Acid Chelate: This essential mineral supports muscle function and recovery, ensuring your muscles get the nutrients they need to rebuild and grow.

  • Creatine: Known for its ability to increase muscle strength and endurance, creatine helps you push harder during workouts and recover faster afterward.

  • L-Glutamine: An amino acid that plays a vital role in muscle recovery and growth. It helps reduce muscle soreness and supports the immune system.

  • Glutamine Peptides: A blend of amino acids that further supports muscle recovery and growth, ensuring your muscles are well-nourished.

Here are the nutrition facts for Serious Mass:

  • Calories: 1,250 per serving

  • Protein: 50 grams per serving

  • Carbohydrates: 253 grams per serving

  • Fat: 4 grams per serving

  • Fiber: 2 grams per serving

  • Sugar: 0 grams per serving

  • Sodium: 200 milligrams per serving

  • Cholesterol: 20 milligrams per serving

With this powerful combination of ingredients, Serious Mass provides the ultimate support for anyone looking to gain weight and build muscle mass.

You will get results taking Optimum Nutrition Serious Mass. There's no denying it. This is a trustworthy brand in the supplement industry.

My results can attest to it. However, start out with one scoop as I said. Don't overdo it. Listen to your body. You are getting creatine monohydrate in this product. And it's going to accelerate your results.

The key ingredients in the Protein Blend are Whey Protein Concentrate, Calcium Caseinate, Egg White, Sweet Whey.

Egg white protein in my mind is always extremely beneficial. Those of you vegetarians reading, this is not for you. However, for the average guy looking to gain some serious muscle, I recommend you give this a shot.

For an ideal post workout, this will aid in muscle building from the hard work you've done. Optimum Nutrition Serious Mass tastes great and dissolves well in milk but works best in a blender. I'll get to the taste later.

However, there is a massive con I will get to in the next section. This can cause major farts. No joke.


Con's of Optimum Nutrition Serious Mass

This product is not at all for beginners just getting started in weight training. I encourage you to start taking this after you've built up a tolerance to whey protein. More importantly, you know your body better than anyone. You also get sweet dairy whey, which may be a con for some vegetarians.

When you are looking for a substantial weight gain supplement, there are many things that you must consider looking for and that is the following:

  • Calorie content
  • Protein
  • Carbohydrates
  • Healthy fats
  • Vitamins and essential minerals

This can easily replace calorie contributing foods and become a meal replacement, however, this is my number one problem with this product, it contains soy. And the biggest con for me are the artificial fillers.

This ripped through my gut RECENTLY and I know it wasn't just anything else other than ON serious mass. It will trigger IBS. That stands for irritable bowel syndrome. One last point to this supplement, you need to mix it good.

And you will need a post workout recovery tool as part of a complete meal to raise caloric intake. What is that? An electric blender brothers.

How Does Optimum Nutrition Serious Mass Taste?

I've tried the chocolate peanut butter protein powder and I personally enjoy the taste. However, taste is all perception. It will be different for you than me. 

So I'll tell you how to improve taste for this mass gainer protein powder. If you want a higher calorie shake, this is why you gotta stay full...

The nutrition you need after a workout and between meals shake Mix 2 scoops of the powder into 24 fluid ounces of cold water or milk using an electric blender with a few ice cubes as well.. Mix into any beverage. That's how to make this muscle building post workout shake.

This allows to you add in fruits, peanut butter and other calorie-contributing foods. TIP: New users should start with a 1-scoop half serving

Here's what you can do if you want to sweeten your protein drinks in a blender.  Add Organic Pure Maple Syrup. Just one tablespoon. And just a pinch of sea salt. Use low fat milk or unsweetened almond milk.

How to Enhance The Taste of Optimum Nutrition Serious Mass

You can use other calorie contributing foods such as gluten free rolled oats in your smoothies. Any time you have other calorie contributing foods, you are getting the benefits of keeping yourself full for a long time, especially if you have weight gain goals.

I suggest adding more to your protein shakes. So let's talk about that and address enhancing taste. The purpose for this section is to give you a tip on enhancing the taste for people who find it too bland.

Organic maple syrup will bring out the sweetness. Believe me, I have made protein smoothie using optimum nutrition serious mass chocolate peanut butter for a long time. Get the pink himalayan salt. Not the shitty kind.

A tad bit of salt with sweetness goes a long way. JUST A LITTLE BIT. Do not overdo it on the salt. Mass gainers can often taste like shit. This does not taste like shit. However, you need blended protein powder if you don't want it to taste so fucking thick.

If you get the chocolate flavor, I encourage you to enhance the taste. Optimum Nutrition releases another weight gainer protein powder (in my mind) can be very thick to most people taking it.

Third Party Testing and Lab Data

While Optimum Nutrition Serious Mass is not third-party tested, the brand does offer multiple third-party tested products, such as its Gold Standard Whey Protein and Essential Amino Energy BCAA Powder. Our independently accredited lab has given Serious Mass an overall C grade in relation to the over 150 products tested. 

However, it’s crucial to consider that third-party testing is not a guarantee of a product’s effectiveness or safety. Optimum Nutrition’s reputation and the positive results reported by users can provide additional confidence in the product’s quality.

Comparison to Other Weight Gainers

How Optimum Nutrition Serious Mass Compares

In the crowded market of weight gainer protein powders, Optimum Nutrition Serious Mass stands out for its high-quality ingredients, substantial calorie content, and excellent taste. Unlike many other weight gainers, Serious Mass offers a unique blend of protein sources, including whey protein concentrate, casein protein, and egg protein. This combination ensures a sustained release of amino acids, crucial for muscle growth and recovery.

Moreover, Serious Mass is enriched with essential minerals like molybdenum amino acid chelate, which supports overall health and well-being. Its high calorie content, combined with premium ingredients, makes Serious Mass the perfect supplement for anyone looking to gain weight and build muscle mass. Whether you’re struggling to consume enough calories through whole foods or need a reliable post-workout shake, Serious Mass delivers the nutrition you need to achieve your fitness goals.

Potential Side Effects and Allergens

As with any supplement, it's important to be aware of potential side effects and allergens when using Serious Mass. Some common side effects that users might experience include stomach cramps, diarrhea, nausea, bloating, and gas. These side effects are often related to the body's adjustment to the high-calorie and high-protein content of the supplement.

Serious Mass contains several ingredients that may be allergens for some individuals, including milk, egg, wheat (glutamine peptides), and soy (lecithin). If you have allergies to any of these ingredients, it's crucial to consult with a healthcare professional before using this product. Additionally, the creatine content in Serious Mass may cause stomach cramps, diarrhea, and nausea in some individuals.

It's also important to note that Serious Mass is not suitable for everyone, particularly those with certain medical conditions or those taking specific medications. Always consult with a healthcare professional before starting any new supplement regimen, especially if you have underlying health issues or are on medication.

To minimize the risk of side effects and allergens, follow the recommended dosage and usage instructions for Serious Mass. Maintaining a sensible whole foods diet and staying hydrated will also support overall health and well-being while using this supplement. Remember, achieving your weight gain goals should be a balanced approach that includes proper nutrition, hydration, and exercise.

Places to Buy Optimum Nutrition Serious Mass

Optimum Nutrition Serious Mass is widely available online and in stores. You can purchase it directly from the brand’s retail site or from select third-party retailers, including Amazon, DICK’S Sporting Goods, GNC, Walmart, and others. When buying from third-party retailers, it’s essential to ensure that the product is genuine and not counterfeit. Always check for reputable sellers to guarantee you’re getting the authentic Optimum Nutrition Serious Mass to support your muscle building and weight gain journey.

Why I Prefer This Mass Gainer Protein Powder

Now it's time to cover the only reason I prefer very FEW mass gainers. Optimum Nutrition Serious Mass Gainer is one of them. However, it does flare up my IBS, so if I go back to this mass gainer... I measure it to a half of a scoop.

It contains glutamine peptides in which you are getting essential EAAs. Its time to tell you all how this plays out in your body.

Glycogen stores are the storage form of glucose in the body, primarily found in the liver and muscles:

  • When you consume carbohydrates, they are broken down into glucose, which is either used immediately for energy or stored in the form of glycogen.
  • The liver stores glycogen to maintain blood glucose levels, while muscles store glycogen to provide energy during physical activity.

Supports Muscle Growth and Recovery

Glutamine peptides are a form of the amino acid glutamine that is bonded to other amino acids to form peptide molecules. Here are some key points about glutamine peptides:

  • Glutamine is a conditionally essential amino acid, meaning that the body can produce it in small amounts but may require higher levels during times of stress, intense exercise, or illness.

  • Glutamine is important for various physiological functions, including immune system support, gut health, and muscle recovery.

  • Peptides are short chains of amino acids linked together by peptide bonds.

  • Glutamine peptides are created by bonding glutamine molecules with other amino acids to form peptide compounds.

Some of you probably don't give a single fuck about that but this is to give you an idea of how your body breaks down protein and carbohydrates.

This weight gainer protein powder in my mind has an impressive protein to carbohydrate ratio.

All in all, this is definitely a protein solution that can and will get you some serious gains. However, the digestive issues it comes with, I'm rating this 6.5 out of 10.

If you are under 18 years of age or have a suspected medical condition, I'd say choose Gold Standard Whey Protein Powder. 

The whole reason for two points down is the fact that creatine monohydrate is under-dosed. You would need to get creatine monohydrate separately. However, it does have L-glutamine, glutamine peptides, Choline, Inositol, PABA, and MCTs.

Lastly, you will need to buy a blender. You can't get away with not using one as it will taste thick as fuck and the consistency won't be as good without a blender.

Please only buy this if you do not have a sensitive gut and you can handle the fillers it comes with. It's definitely not for people who have a history of IBS.

Last important point... You need a good workout plan on top of taking Optimum Nutrition Serious Mass. That means get on my fitness course NOW. I won't be offering the special promo that much longer.

As Featured in BrainZ Magazine

Adam is The Host of The Masculine Mindset Show, Creator of Alpha Body Bootcamp Video Course. He is a professional fitness trainer of 8 years and continues to change lives. He created 14 Day Mind & Muscle Challenge for his dedicated podcast fans. Author of 77 Ways to Develop a Masculine Mindset & Become The Alpha Women Want.

Adam Mark Skoda

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