Optimum Nutrition Serious Mass Review: Uncovering the Facts

Written by James C., M.S.(C), PT

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Optimum Nutrition Serious Mass is a popular weight gainer supplement designed for those looking to increase their daily calorie intake and build muscle mass. This product offers a significant dosage of protein, vitamins, and minerals as well as added glutamine and creatine to optimize muscle growth and recovery. Being a product from a reputable company, Optimum Nutrition, it is essential to dive deeper into this supplement and determine its safety and effectiveness.

In this article, we will provide an in-depth review of Optimum Nutrition Serious Mass, considering its nutritional profile, specific ingredients, taste, mixability, and more. We will also discuss the potential benefits and side effects associated with its usage, as well as its availability and purchase options. Finally, we will answer some frequently asked questions to give a comprehensive understanding of this supplement and its role in supporting your goals.

Key Takeaways

  • Optimum Nutrition Serious Mass is a weight gainer supplement designed for muscle growth and recovery.
  • The product offers a significant dosage of protein, vitamins, and minerals, as well as added glutamine and creatine.
  • This article reviews its nutritional profile, benefits, side effects, and more to help users make an informed decision.

About Optimum Nutrition

Optimum Nutrition Serious Mass Review

Optimum Nutrition is a well-known sports nutrition company that offers a wide range of products aimed at helping individuals achieve their fitness and bodybuilding goals. One of their popular products is Optimum Nutrition Serious Mass, a high-calorie weight gainer supplement designed to support muscle building and weight gain for those who struggle to consume enough calories through their regular diet.

ON Serious Mass contains 50 grams of protein per serving, sourced from a blend of three types of protein. This blend helps to support muscle growth and recovery, making it an ideal choice for athletes and bodybuilders. In addition to protein, the supplement also contains 4.5 grams of fat, primarily in the form of medium-chain triglycerides (MCTs), which are an easily digestible source of energy that has been linked to several health benefits.

A significant component of ON Serious Mass is carbohydrates, with the supplement containing an ample amount of maltodextrin, a sweet polysaccharide. These carbohydrates help to replenish glycogen stores in the muscles, which is essential for fueling workouts and promoting recovery. Additionally, the product contains creatine, glutamine, and other essential nutrients to further support muscle growth and overall health.

Optimum Nutrition Serious Mass has received positive reviews within the bodybuilding community for its effectiveness in helping individuals gain weight and build muscle mass. However, as with any supplement, it’s essential to be aware of potential side effects, such as digestive discomfort or an imbalance in macronutrient consumption. It is always advisable to consult with a healthcare professional or certified nutritionist to determine if this product is the right choice for an individual’s specific needs and goals.

In conclusion, Optimum Nutrition is committed to providing effective, high-quality sports nutrition products, with Serious Mass standing out as an exceptional weight gainer supplement. Its combination of proteins, carbohydrates, and essential nutrients work together to support muscle growth and recovery for those looking to gain weight and build muscle.

Product Description and Features

Optimum Nutrition Serious Mass is a weight gainer supplement designed to support muscle building and help individuals achieve their weight gain goals. This high-calorie, high-protein, and high-carbohydrate product is particularly beneficial for people who struggle to consume enough calories from food alone to maintain or gain weight.

The formula includes 1,250 calories, 254 grams of carbohydrates, and 50 grams of blended protein per 2-scoop serving. These nutrients aim to provide the essential building blocks for muscle growth, strength, and overall mass increase. It’s worth noting that Serious Mass contains egg, soy, and milk, so individuals with allergies or intolerances to these ingredients should be cautious.

In addition to the core calories and macros, Serious Mass contains creatine and glutamine. Creatine, although present in a relatively low amount of 1 gram per serving, can still support strength and muscle expansion. Glutamine and glutamine peptides, at 500 mg each per serving, play a role in muscle recovery and immune system support.

To summarize, Optimum Nutrition Serious Mass offers the following key features:

  • High-calorie content to support weight gain goals
  • A blend of proteins, carbohydrates, and fats for comprehensive nutrition
  • Creatine and glutamine for strength and muscle recovery support
  • Ideal for individuals struggling to consume enough calories through diet alone
  • May not be suitable for those with egg, soy, or milk allergies or intolerances

Remember to keep in mind that, as with any supplement, individual results may vary, and it’s essential to combine Serious Mass with a well-rounded diet and exercise program to achieve the best results.

Nutritional Profile

Optimum Nutrition Serious Mass Ingredients

Optimum Nutrition Serious Mass is a high-calorie, protein-packed weight gainer supplement designed to help individuals achieve their muscle building and mass gaining goals. The following paragraphs detail its nutritional profile with key ingredients and essential nutrients.

Each serving of Serious Mass contains approximately 1,250 calories, which makes it an excellent choice for those looking to increase their caloric intake. These calories mainly come from carbohydrates and protein sources, with minimal amounts of fat. The carbohydrates serve as a significant energy source, while the protein helps support muscle growth and repair. The supplement contains around 50 grams of protein per serving, providing an ample amount of this essential nutrient.

In addition to the high caloric content, Serious Mass includes essential vitamins and minerals. These micronutrients help support overall health and body function during periods of intense training and growth. Some of the notable vitamins and minerals incorporated in Serious Mass are vitamins A, C, and D, as well as minerals such as iron and calcium.

The supplement is also fortified with important ingredients like creatine and glutamine. Creatine helps improve athletic performance and muscle strength, while glutamine aids in muscle recovery and supports the immune system. Although the creatine dose is relatively low at 1 gram per serving, it still adds value to the product’s overall nutritional profile.

The nutritional information for Serious Mass indicates that the supplement is low in fat, containing only about 4 grams of fat per serving, which comes mainly from medium-chain triglycerides (MCTs). MCTs are easily absorbed and can provide a quick energy source, making them a beneficial addition to the mix.

Flavors vary for Optimum Nutrition Serious Mass, offering users a selection that can suit their taste preferences. Popular flavors include chocolate, vanilla, and cookies & cream, providing consumers with options in terms of taste while maintaining the same nutritional benefits.

In summary, the nutritional profile of Optimum Nutrition Serious Mass is designed to support muscle growth and weight gain. It achieves this through a high caloric content consisting mostly of carbohydrates and protein, essential vitamins and minerals, as well as the addition of key ingredients like creatine and glutamine. All these nutrients come together in a variety of flavors, making it a versatile and effective supplement for those looking to increase their mass.

Specific Ingredients

Optimum Nutrition Serious Mass contains a well-rounded blend of ingredients designed to support muscle growth and weight gain. Some of the primary ingredients include creatine monohydrate, whey protein, calcium caseinate, and maltodextrin. These ingredients work synergistically to provide the necessary nutrients for optimal muscle gains.

The supplement contains a blend of proteins, including whey protein concentrate, egg albumen, and sweet dairy whey. This blended protein approach ensures the availability of essential amino acids for muscle repair and growth. Moreover, the product features 50g of protein per serving to support muscle building efforts.

One of the key ingredients in Serious Mass is creatine monohydrate, which plays a crucial role in energy production and muscle recovery. Creatine helps to increase muscle strength, enhance performance, and promote lean body mass. Additionally, glutamic acid, an amino acid, has been included to potentially assist in recovery and overall muscle growth.

Carbohydrates are an essential component of Serious Mass, with 250g provided per serving, primarily sourced from maltodextrin. This ingredient helps to fuel workouts, replenish glycogen stores, and support overall weight gain. While the sugar content in the supplement may be a concern for some users, it can be beneficial for individuals struggling to consume enough calories to support their muscle-building goals.

The inclusion of medium chain triglycerides (MCTs) provides an energy-rich fat source that may further support calorie intake and muscle growth. These healthy fats are more efficiently utilized by the body and are less likely to be stored as fat compared to long-chain triglycerides.

In addition to the macronutrients, Serious Mass contains 24 vitamins and minerals, ensuring that users receive the necessary micronutrients for overall health and wellness. This comprehensive profile helps support the body’s functions during intense training and muscle-building phases.

In summary, Optimum Nutrition Serious Mass offers a well-rounded blend of ingredients, including creatine monohydrate, whey protein, calcium caseinate, maltodextrin, and MCTs, designed to facilitate muscle growth and weight gain. The amino acids, vitamins, and minerals present in the formula help support recovery and overall health, making it a valuable nutrition supplement for those seeking to increase muscle mass and size.

Taste and Mixability

When it comes to the taste of Optimum Nutrition’s Serious Mass, users can choose from a variety of flavors, including chocolate, banana, strawberry, and vanilla. The taste is generally satisfactory, with the chocolate flavor offering a heavy milk chocolate taste. However, some users find it not particularly outstanding, so personal preferences play a role in taste satisfaction.

As for mixability, using a blender appears to be the most effective method for mixing Serious Mass powder into a smooth shake. When using a blender, users experience no problems in achieving a lump-free consistency. Nevertheless, it is essential to make sure that adequate liquid is used for blending to avoid a thick, difficult-to-consume shake.

On the other hand, mixing the powder using just a shaker bottle can be challenging. It might require a significant amount of shaking to reach a drinkable state. Despite intense shaking, some clumps of powder might remain, resulting in a less smooth texture.

In summary, the taste of Optimum Nutrition Serious Mass depends on individual preferences, while its mixability can be significantly improved by using a blender instead of a shaker bottle. Executing these practical tips would help users enjoy their shakes and reap the benefits of this weight gainer.

Usage and Serving Suggestions

Optimum Nutrition Serious Mass is a high-calorie supplement designed to support muscle building and weight gain. Each serving of Serious Mass contains 1,250 calories, 50 grams of protein, and 250 grams of carbohydrates, making it an ideal addition to a high-calorie diet for individuals looking to gain mass.

For optimal results, it is recommended to consume Serious Mass after a workout session, as a post-workout meal supplement. This helps to provide the body with the necessary nutrients for muscle recovery and growth. Additionally, taking a serving of Serious Mass before bed can further support muscle growth during sleep when the body undergoes natural recovery processes.

In between meals, Serious Mass can be used as a convenient and efficient means to increase overall calorie intake. This is especially useful for individuals with a high metabolism or those who struggle to consume sufficient calories through regular meals alone. Incorporating Serious Mass in between meals can help maintain a steady stream of nutrients required for muscle growth and weight gain.

It is important to note that serving size may vary depending on individual goals and needs. As a starting point, using one scoop (approximately 165 grams) and gradually increasing to two scoops (approximately 330 grams) based on individual preference and requirements may be practical. Mixing Serious Mass with water or milk may also help to improve overall taste and consistency.

In summary, Optimum Nutrition Serious Mass can be incorporated into one’s diet to support muscle building and weight gain by consuming servings post-workout, before bed, and in between meals, depending on individual preferences and goals. Adjusting serving sizes as needed, alongside a high-calorie diet, can further enhance its effectiveness in supporting muscle growth and weight gain.

Potential Benefits

Optimum Nutrition Serious Mass is a popular weight gainer supplement designed to help individuals build muscle mass and increase their overall body weight. This high-calorie, protein-rich formula is aimed at supporting muscle recovery and promoting growth. Here are some potential benefits of using this mass gainer in your fitness journey:

Muscle Mass & Recovery: Serious Mass contains 50 grams of protein per serving, sourced from multiple types of proteins. This comprehensive protein blend can contribute to muscle mass gains and facilitate muscle recovery after intense workouts.

Weight Gains: With 1,250 calories and 250 grams of carbohydrates per serving, Serious Mass is an effective weight gainer supplement for those struggling to bulk up. The high caloric content helps increase daily caloric intake and supports weight gains, particularly for individuals with fast metabolisms or those who find it challenging to consume large quantities of food in their daily diet.

Energy & Performance: The carbohydrates provided in Serious Mass serve as a source of energy, fueling workouts and enhancing performance. This can help athletes maintain higher levels of energy throughout their training sessions and support overall gains in strength and muscle size.

Physique: As weight gains occur and muscle mass increases, the physique of the user may also improve. Combining Serious Mass with a proper workout routine and balanced diet can help individuals achieve a more aesthetic and muscular appearance.

Support Muscle Recovery: Along with the protein content, Serious Mass also contains creatine and glutamine, which are essential components in muscle recovery and growth. These ingredients help improve the body’s ability to recover from workouts, further supporting muscle growth and strength gains.

Possible Side Effects

Optimum Nutrition Serious Mass is a popular mass gainer supplement designed to help individuals increase their calorie intake and support muscle growth. While many users find success with this product, it’s essential to be aware of some potential side effects. In this section, we will discuss some of the possible side effects, such as digestive problems, bloat, and fat gain.

One common issue that some users may experience is digestive problems. The high-calorie content and a large number of carbohydrates in Serious Mass can lead to stomach discomfort, diarrhea, gas, or constipation. To minimize these side effects, try starting with a smaller serving size and gradually increasing it, or consider consuming it with a fiber supplement to help with digestion.

Another potential issue is bloating. Serious Mass contains a considerable amount of carbohydrates, which can cause water retention and bloating in some users. To counteract this, make sure to drink plenty of water and try to consume smaller portions of Serious Mass throughout the day instead of one large serving. This can help your body gradually acclimate to the calories and carbohydrates, reducing the risk of bloating.

Lastly, fat gain can be a concern, especially if you are consuming Serious Mass in excessive amounts or not exercising regularly. While this supplement is primarily designed for muscle growth, consuming more calories than your body needs for energy and muscle repair can lead to fat gain instead of lean mass. To prevent this, it’s essential to monitor your overall calorie intake and engage in regular strength training and cardiovascular exercise to ensure a proper balance.

In summary, Optimum Nutrition Serious Mass can provide valuable calories and muscle-building nutrients for those looking to gain weight and size. However, it’s important to be aware of potential side effects like digestive problems, bloat, and fat gain. Adjusting serving sizes, staying hydrated, and maintaining a well-balanced exercise routine can help mitigate these issues and support a successful weight gain journey.

Product Availability and Purchase

Optimum Nutrition Serious Mass is widely available for purchase through various online and physical retailers. One popular platform for purchasing this product is Amazon. Shopping on Amazon provides customers with the convenience of door-to-door delivery and the possibility of benefiting from special offers or discounts.

Customers interested in staying up-to-date with the latest news, promotions, and weekly offers can sign up for the newsletter on the Optimum Nutrition website. By doing so, they may receive valuable information on the best times to purchase Serious Mass and other related products from the brand.

In terms of pricing, Serious Mass is considered a cost-effective option compared to other mass gainers in the market. However, it is essential to research various retailers and take advantage of promotions to ensure the best value for money.

For those trying out Serious Mass for the first time, some sellers may offer a money-back guarantee. This provides customers with the flexibility to try the product without the risks associated with dissatisfaction. It is recommended to carefully read the terms and conditions of such guarantees, as they may differ across retailers.

Overall, due to its popularity and positive reviews, finding and purchasing Optimum Nutrition Serious Mass is a straightforward process. By comparing prices, taking advantage of offers, and utilizing money-back guarantees, customers can make confident and informed decisions when buying this mass gainer supplement.


In summary, Optimum Nutrition Serious Mass can be a valuable addition to a well-rounded diet, especially for those who struggle to meet their calorie needs through whole foods alone. Personal trainers and other fitness professionals often recommend a balanced approach to nutrition, focusing on whole foods while supplementing when necessary.

Although it is packed with calories, protein, and carbohydrates, it is important to consider individual dietary needs and any potential allergens. Serious Mass contains ingredients such as whey protein concentrate and egg whites, which might not be suitable for individuals with lactose intolerance or egg allergies.

For optimal results, it is crucial to consult with a knowledgeable personal trainer or nutritionist who can better assess an individual’s calorie needs and advise on the appropriate use of dietary supplements like Serious Mass. Balancing a well-rounded diet that includes a variety of whole foods with the smart utilization of supplements can help support muscle building, weight gain, and overall health goals.

In conclusion, Optimum Nutrition Serious Mass can be a helpful tool in meeting calorie requirements and supporting muscle growth, but it should not replace the consumption of nutrient-dense whole foods. By remaining mindful of individual dietary needs, allergens, and working with a knowledgeable professional, one can effectively utilize Serious Mass as part of a comprehensive nutritional strategy.

Frequently Asked Questions

What are the key ingredients in Optimum Nutrition Serious Mass?

Optimum Nutrition Serious Mass contains 50 grams of protein, 250 grams of carbohydrates, and 24 vitamins and minerals per serving. Additionally, it includes creatine and glutamine, which can help to improve workout performance and recovery.

How should Serious Mass gainer be used for best results?

For the best results, it is recommended to use Serious Mass after workouts or between meals to help in boosting calorie intake and aiding muscle building and weight gain. Users should mix the suggested serving size with their preferred liquid, such as water or milk, and thoroughly blend it until smooth.

What do users say about Serious Mass on Reddit?

Users on Reddit report varying experiences with Serious Mass. Some users have found it to be effective for gaining weight and building muscle, while others experienced side effects, such as bloating and gastrointestinal issues. As individual experiences may differ, it is important to consider personal goals and dietary needs before using a mass gainer.

What nutritional information should I know about Serious Mass?

Each serving of Serious Mass has 1,250 calories, which mainly come from the carbohydrates and proteins. Additionally, the supplement provides various vitamins and minerals, including vitamin A, vitamin C, calcium, iron, and potassium. Be aware that a single serving size may be quite large and can be split up if the user finds it difficult to consume the entire serving at once.

Where can I find Optimum Nutrition Serious Mass in stores?

Optimum Nutrition Serious Mass can be found at many retail stores that sell sports nutrition products, such as GNC and Vitamin Shoppe. It can also be purchased online from websites like Amazon or directly from the Optimum Nutrition website.

How effective is Serious Mass for skinny people trying to gain weight?

While effectiveness will vary between individuals, many users report positive results when using Serious Mass to gain weight and build muscle. However, it should be combined with a well-balanced diet and an appropriate exercise plan to ensure that weight gain is primarily from increased muscle mass, rather than simply adding body fat.

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