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Serious Mass Review - 14 Things You Need to Know

I need to make a confession: I was obsessed with researching Serious Mass. We dug deep into ingredients, side effects, clinical research and quality of customer service. Additionally, we examined hundreds of consumer comments and reviews. Then, we condensed and summarized to give you the info you need.

Serious Mass can be purchased through their Official Site.

Serious Mass Readers: Noom is offering our readers a risk-free trial, for a limited time. Click here for more information!

What is Serious Mass?

Serious Mass Nutrition is an extremely high-calorie protein powder, with each serving being 1,250 calories along with 50g of protein. Serious Mass is a slow-digesting protein powder.

The supplement comes in various flavors, including:

  • Chocolate
  • Chocolate Peanut Butter
  • Strawberry
  • Vanilla
  • Cookies & Cream

The mixture promotes the recovery of muscles after a workout and is a shake taken between meals to gain muscle mass.

Serious Mass Nutrition comes in Serious Mass 12 lb and Serious Mass 6 lb packs.

So, is gaining weight with shakes a new thing and is there any science around it?

  • The American Journal of Clinical Nutrition – As far back as the 1970s scientists were using shakes as a means of gaining weight for experimentation purposes.
  • Eating Behaviors – And scientists aren’t the only ones experimenting with ways to gain weight on their own. So are young adults between the ages of 17 and 32.
  • Mayo Clinic Proceedings – However, experimental weight gain comes at a price. Some research shows it increases blood pressure in otherwise healthy individuals.

Serious Mass

Serious Mass Competitors

Whey Protein
Syntha 6
Mutant Mass
Other similar products: Isagenix, , Optifast, SlimFast
Company Info

How Did Serious Mass Start?

Optimum Nutrition, the Serious Mass label manufacturer, started operating in 1986 and has since produced many nutritional supplements manufactured from natural ingredients for bodybuilders and athletes.

The brand is well-known for its ‘gold standard’ products released as powder, bars, tablets, capsules, and ready to drink products.

The Serious Mass label is available via the company’s official website and trusted sites globally.


Serious Mass Claims

Optimum Nutrition claims to be a mass gain formula that, when mixed with water, provides a high calorie, high carbohydrate shake that builds muscle mass, if used in conjunction with an exercise routine.

The company also states that Serious Mass gives the user the tools to increase their muscle size while undertaking a weight training regime.

In addition to the Serious Mass calories and carbohydrates, the supplement also contains creatine and glutamine that assist with muscle recovery after a heavy workout.

The product is for adding mass without adding fat. It is difficult to eat the amount of food necessary to bulk up muscles rapidly, but using a drink such as Serious Mass will allow you to imbibe the number of calories required to build the mass and aid in the recovery of muscle tissue.


Serious Mass Ingredients

Optimum Nutrition claims that Serious Mass is a powder designed to be mixed with water to make a nutritional shake.

The product contains 1,250 calories per serving which is the equivalent of three hamburgers with fries. The major ingredients in the powder include:


252 g per Serious Mass nutrition serving

Carbohydrates are sugars, fiber, and starch found in vegetables, grains, fruits, and milk, according to Advances in Nutrition

They are an important component of a balanced diet and provide the fuel to power the central nervous system, as well as energy to work the muscles.

The name carbohydrate comes from the fact that at a molecular level they contain hydrogen, oxygen, and carbon.

Carbohydrates are recommended while exercising to ensure that your body has the fuel it needs to undertake the work.


50g per Serious Mass nutrition serving

Protein is required for muscle bulk. It is also important to general growth and aging, according to NutrientsPlus, a high-protein diet could lead to weight loss and management, per the Journal of Food Science

Too much protein can cause a buildup of toxic ketones in the body which will, in turn, place your kidneys under stress to try and eliminate them.

The Serious Mass protein in this shake has been carefully calculated to provide what your body needs but not enough to place stress on your organs.

Serious Mass ingredients

Vitamins and Minerals

Serious Mass contains 25 vitamins and minerals including vitamins A, C, D, and E along with minerals such as Calcium, Iron, Phosphorus, Iodine, Magnesium, Zinc, and Selenium.

Vitamins and minerals are vital to streamline and manage all of the body’s functions, according to the National Center for Complementary and Integrative Health.


Glutamine is the amino acid that is most abundant in the body and is widely used in sports nutrition, according to Nutrients. It is created in the muscles and distributed by the blood system to cells that need it to build protein.

Serious Mass ingredients


Creatine is a natural product that the body turns into creatine phosphate.

Creatine phosphate is used by the body to make adenosine triphosphate (ATP) which is the energy used in muscle contractions, according the Journal of the International Society of Sports Nutrition.

Does It Work?

Does Serious Mass Work?

Serious Mass reviews show that the product has been successful as a weight and mass enhancer, leading to increased musculature.

This supplement provides a considerable boost to the daily caloric intake.

Intense muscle building routines require a substantial number of calories to fuel exercise, and these additional calories are difficult to ingest by eating solid food.

The additional Serious Mass calories linked with a high carbohydrate and Serious Mass protein content facilitate muscle creation, and the extra calories allow for longer exercise time.

Reduced muscle recovery time from extreme exercise occurs.

This supplement can be used either at mealtimes or as an in-between snack and a night time booster.

Benefits & Results

Serious Mass Benefits and Results

Serious Mass has not gone through scientific testing to verify that the product does what it claims.

The company must declare that the FDA has not evaluated the product and does not treat any disease.

You are at the manufacturer’s mercy to ensure the ingredients are not contaminated, and the product contains what is on the label.

Serious Mass benefits

Anecdotal evidence and Serious Mass reviews from users indicate that the product has worked to build mass.

None of the reviews indicated that they had not built mass, but there were many reviews the user would not purchase the product again due to a dislike of the taste or the product’s cost.

The most popular flavor through most of the reviews was Serious Mass Vanilla, as it is said to combine well with milk and fruit.

Weight Loss

Serious Mass and Weight Loss

Serious Mass is not a weight loss product, and with its composition, it will never assist with the loss of weight.

The carbohydrate concentration will add fat if this product is not used correctly and does not accompany an intense weight training regime.

Serious exercise is required to burn the calories that are within this product.


How to Use Serious Mass

Recommended Serious Mass Serving Size:

  1. Add 24 oz water into a blender with two heaped Serious Mass scoops of your chosen Serious Mass powder
  2. Blend for approximately 60 seconds
  3. Add some ice cubes and blend further

If you replace the 24oz water with low-fat or skimmed milk, you will get a thicker and creamier shake higher in calories.

Optimum Nutrition recommends that new users start with ½ the normal Optimum Mass serving size for the first week (1 heaped Serious Mass scoop) and then build up to the full serving.

Serious Mass Serving Size for In Between Meals

Take a ½ serving (1 heaped Serious Mass scoop) in between meals.

Drinking this will help to support your high-calorie diet and maintain a positive nitrogen balance.

Serious Mass Serving Size for After Workout

Drink a serving (2 heaped Serious Mass scoops) of Serious Mass 30-45 minutes after your workout. This will enhance your recovery.

Serious Mass Serving Size for Bedtime

Drink a serving (2 heaped Serious Mass scoops) of Serious Mass 45-60 minutes before bed.

This will provide the body with all the nutrients it needs to aid muscle recovery overnight. Optimum Foods recommends that the supplement be used in conjunction with an intense weight training regime five times a week.

Allow at least 48 hours of recovery between exercising the same body parts to facilitate sufficient recovery time.

Side Effects

Potential Serious Mass Side Effects

Serious Mass is a very high calorie, protein-packed supplement designed to add mass when used in conjunction with a workout program. While it has it’s benefits; it can also result in some unpleasant side effects.

Increased Calories

For the average person, the daily intake of calories should be around 2,000 calories.

Serious Mass contains 1,250 calories per serving, and one pound of fat contains around 3,500 calories.

This means that if you eat your regular diet and add just one serving of Serious Mass each day, you will gain one pound every three days.

This fat gain can only be negated by an exercise program to ensure you burn the extra calories.

Serious Mass side effects

Vitamin A

Each serving of Serious Mass contains your full daily requirement of vitamin A.

Should you include foods rich in vitamin A, such as spinach, kale, and carrots in the mixture, you may be at risk overconsumption of vitamin A.

Overdosing on Vitamin A can lead to stomach ailments, vomiting, fever, anorexia, and irritability.


Serious Mass contains creatine.

Creatine is a common ingredient in many dietary supplements. If you are using other supplements that contain creatine, you may be at risk of kidney damage, says a study in the Journal of the International Society of Sports Nutrition.

Taking in too much creatine can cause several side effects, such as nausea, stomach pain, muscle cramps, and dehydration as creatine draws water from the body.

Impaired Workout Recovery

One of the side effects of exercise is that the body’s sensitivity to insulin is improved.

This improved sensitivity allows your body to use insulin efficiently and decreases the risk of gaining fat.

As Serious Mass contains 100% of your recommended daily allowance of vitamins C and E, additional intake of these vitamins may work against your recovery.

Vitamin C is water-soluble, so the excess is excreted via the urine, leading to nausea, stomach cramps, and diarrhea.

Bloating and Gas

Many reviews on the internet tell of an upset stomach after using Serious Mass.

These upsets also contribute to nausea, diarrhea, bloating, and gas.

As with any supplement, you should consult your doctor before starting to use this product.

Many of the side effects of these ingredients can lead to nausea and stomach problems.

Any upset stomach that occurs after starting to use this supplement should be discussed with your doctor.

Product Warnings

Serious Mass Product Warnings

No product warnings are available for Serious Mass.

There may be no published warnings for the product, but there are some genuine side effects, and these should be a warning to anyone starting to look at using any mass gain product.

A careful examination of the mass gain product ingredients should occur along with comparing the ingredients in any other supplements that you may be taking. Ensure that you do not overload your body with any vitamins or other ingredients in the supplements.

The market is unregulated, and no long-term studies on the effects of these products on the body. The products are all supplied in powder form, so it is impossible to determine each ingredient’s quality and origin.

Do not be tempted to buy cheap products manufactured in countries that have poor or no regulatory environment.


Any Serious Mass Lawsuits?

No lawsuits related to Serious Mass have been discovered. A class-action suit against Optimum Nutrition for slack filled products was found but the case applied to whey products and not Serious Mass.


Serious Mass Alternatives

There are many products on the market that play in the same arena as Serious Mass.

Some of the better-known alternatives are:

  • Pro Complex Gainer
  • Ultra-Premium True-Mass
  • Mass-Tech from Muscletech
  • Super Mass Gainer from Dymatize
  • Real Gains from Universal Nutrition
  • Mass Jym from JYM Supplement Science
  • Stacked Protein Gainer from Evlution Nutrition
  • Carnivor Mass from Musclemeds
  • Mass-Tech 2000 from Muscletech
What Users Are Saying

What Users Are Saying

“Awesome product! I have been gaining A LOT of weight off of it in such little time. Also, it is a great product for when you are done working out.”

“This is the devil juice! Gave me the poops and f’ed up my cholesterol levels. – I was biking 60 minutes a day and lifting weights every other day, eating healthy. I drank just one of these after lifting and it through my blood work off so bad. My BMI is great and I’m in shape. My doctor was shocked and thinks it was this product. I’ve felt better since stopping, blood returning to normal. Not worth it!”

“I wanted to gain weight and even though I only took this once or twice a week I definitely added weight over time when it’s always been hard for me to gain weight this thing did the job.”

Bottom Line

The Bottom Line on Serious Mass

So, are you ready to jump on the Serious Mass train? Well, we like that we located some positive customer comments and that the company has been a staple in the marketplace for decades, but we have concerns about this one because of the lack of solid science supporting the claims. We’re also hesitant due to the reports of negative side effects and overall poor taste.

If you’re ready to improve your strength, we suggest going with a program that’s backed by published scientific studies – shown to help people lose weight, but also employing methods that may help you gain muscle.

Among the best smartphone apps we’ve come across this year is Noom. When it comes to muscle building, you get personalized meal plans, food tracking with a nutritionist-managed food database and exercise tracking, among many other tools and resources.

Plus, we love that we can give our readers access to a free trial offer for a limited time.

Learn More About Noom »
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Serious Mass

How much weight can you gain with Serious Mass?

Serious Mass has 1,250 calories in each shake, making it the best formula for weight gain. With 50 grams of quality protein and 250 grams of carbohydrate in every serving, this product promotes optimal muscle mass increase. Serious Mass is perfect for between meal snacks, after a workout, or before bedtime.

What is Serious Mass?

Serious Mass is an instant shake powder is  a supplement for after a workout or between meals, meant to support muscle growth without adding fat.

How many calories are in Serious Mass?

Serious Mass has 1,250 calories in each serving.

What are the ingredients in Serious Mass?

Serious Mass ingredients include maltodextrin, cocoa, a blend of proteins, natural and artificial flavors and calcium citrate.

What are the side effects of Serious Mass?

Possible side effects of Serious Mass may include fat gain, liver problems, kidney damage and inhibited workout recovery from decreased insulin sensitivity.

Where can I buy Serious Mass?

Serious Mass can be purchased using their Official Site.

Does Serious Mass work?

Serious Mass shows success as a weight and mass gainer, leading to increased muscle mass from increased protein intake.

What is the price of Serious Mass?

The price range for Serious Mass is from around thirty dollars for a six pound bag to less than fifty dollars for a 12 pound bag.

Where can I buy Serious Mass?

Serious Mass is available at nutrition stores such as GNC, as well as online retailers such as Vitamin Shoppe, Nutra Health Supplements, eBay, and Amazon.

How do you take Serious Mass?

Mmix 2 scoops of Serious Gain with 24 ounces of any cold beverage. If you are just starting out, start with a half serving daily for the first week. Use it between meals or as a calorie boost with meals.

How do I contact Serious Mass customer service?

Customer support for Serious Mass is available through Optimum Nutrition at https://www.optimumnutrition.com/en_US/contact or by phone at 1-800-705-5226.

Can I return Serious Mass?

Purchases of Serious Mass directly from Optimum Nutrition may be returned provided the return is within 30 days of purchase, is accompanied by a purchase order number, and there is at least 75% of the product unused.

What does Serious Mass do?

Serious Mass is a high protein weight gain powder. With regular consumption, this product claims to help users gain weight in a healthy way while aiding in muscle recovery.

How many servings are in Serious Mass?

A 12 pound container contains about 30 servings, if one serving is 2 scoops.

17 Serious Mass Reviews

  • Well produced
    Anonymous (Verified Purchase)

    Well produced

  • Anonymous

    if I prepare serious mass at nighttime and I drink half of it and the other half leave it at Fridge ready to go for a.m. morning for work ??? Is it safe or not ??

    • Montana (Editor)

      Serious Mass does not specify whether or not the mixture can be prepared ahead of time. The product’s directions indicate the beverage should be consumed at the time it is blended together.

  • Perfect if you're underweight or a hard gainer.
    James (Verified Purchase)

    Only product I’ve ever found that works quickly. 1/2 serving morning and before bed and some weight training helped me gain 10lbs a month, I also needed some fat on me as I was seriously underweight.

    • Z

      Half and half or just half through the day?

  • Anonymous

    best time to take serious mass?

    • Montana (Editor)

      According to their official website, you can take Serious Mass throughout the day for extra caloric intake.

  • help!!!!!
    shonda (Verified Purchase)

    why do i feel bloated?

    • Luis (Editor)

      Hello Shonda! One of the common reported side effects of Serious Mass was bloating. If you are feeling uncomfortable, make sure to discontinue use and check with your physician concerning other products and methods to gain weight.

  • help
    Ritsa fistes

    Would a person who is a drug addict and used pot in the past come up positive after drinking your product. Person has not smoked in a month but lab results are showing highs and lows of THC use

  • Addicted
    Molly (Verified Purchase)

    I love this stuff seriously. The taste is gross but it works

  • Milton martinez (Verified Purchase)

    This product is awesome.. Ive gained 10 pnds of muscle in 2 months…

  • Such a shame
    Bruce (Verified Purchase)

    First time trying serious mass -Really wanted to like this product but have bloated me and gave me diarrhoea

    • Hazel

      Its did the opposite to me, and given me constipation, and the tastr is synthetic tthee strawberry is moorreee like cherry, thee oonly one i though was okk wastthe vanilla

      • Sheii

        Chocolate taste good

    • Sheii

      Hahahah me too lol

  • shivam

    is serious mass of 6lbs enough to gain 10 kg