Weight gainers, also known as mass gainers, are the heftier cousin to the well-known protein shake. If protein powders are “Jerry,” weight gainers are “Big Jerry.”

Both thick, calorie-dense shakes live in the fitness world, serving the community and helping people accomplish their goals. Mass gainers have one clear benefit; they offer a convenient way to quickly consume a high number of calories with decent nutritional value. For anyone struggling to gain weight, mass gainers provide a solution.

Whatever your goal, you need a diet to match. As the name implies, weight gainers are made to help you gain weight, and so they are perfect for any goals that require the number on the scale to go up. There are many reasons someone would want to bulk up, and weight gainers help you along the way.

If you want to increase your bench or fill out your shirts a bit more, weight gainers can help. 

Weight gainers are available as powders and ready-to-drink shakes. You add these shakes to your everyday diet rather than use them as a meal replacement, and they should help you achieve the calorie surplus you need to put on weight. The extra weight will bring you closer to your goals.

With protein shakes and mass gainers often overlapping their marketing messages of being excellent ways to bulk up, the difference between them can get lost. If you want to know why you would choose one shake over the other, keep reading.

What’s The Difference Between Weight Gainers and Protein Shakes?

While weight gainers and protein shakes share many of the same qualities, you don’t want to mix up the two. The two shakes aren’t interchangeable and are designed for different purposes. Protein shakes supplement a diet lacking in protein, whereas weight gainers offer overall caloric value.

Weight gain is about more than just protein intake, and so, of course, the two shakes are built differently. Here’s how weight gainers and protein shakes differ:

Everything you need to know about weight gainers by Ultimate Nutrition

​​Caloric Content

The defining feature of all weight and mass gainers is the high caloric content, which is essential for gaining weight. You have to be eating in a caloric surplus to gain weight. The easiest way to get in more calories is by eating calorie-dense foods like avocados, peanut butter, and weight gainers!

Mass gainers contain three times more calories per serving than a standard protein powder. The high number of calories is the driving factor behind the expected results of weight gainers; the weight gain.

Man lifts dumbbell

Carbohydrate Content

The primary macronutrient that makes up a protein shake is protein! In weight gainers, the extra caloric content comes from the added carbohydrates, not high-quality protein. 

In IsoMass Xtreme Gainer®, you’ll find a carbohydrate to protein ratio of 16:13, whereas Prostar® 100% Whey protein powder utilizes a carbohydrate to protein ratio of 6:25. The carbs in mass gainers like IsoMass Xtreme Gainer®, are easily digested without making the powder too thick or unmixable. 

Fat Content

The fat content of most mass gainers is markedly higher than that of standard protein powders, mostly coming from dairy additives and essential healthy fats. Protein powders are often designed to offer as much protein as possible in the least amount of calories, excluding any unnecessary fats and carbs. In comparison, weight gainers aren’t looked down upon for having some extra calories here and there.

Man in gym working out

Added Nutrients

The best weight gainer shakes offer more than just a high-calorie count; nutritional value should also be on the table, especially with all those calories to work with. Some brands include beneficial additives such as vitamins, BCAAs, creatine monohydrate, and other ingredients that help offer a more complete dietary package. 

IsoMass Xtreme Gainer® is formulated with so much to offer. In each of seven delicious gourmet flavors you’ll find a precise blend of time-release proteins, complex carbohydrates, 7 types of creatine for muscle growth, 4 types of glutamine for muscle recovery, a complete vitamin premix, a blend of 6 essential fatty acids, a blend of 4 nitric oxide precursors, a creatine precursor complex, and an enzyme complex to increase absorption.

You should never settle for a mass gainer that doesn’t also fulfill your body’s more essential and performance-enhancing needs.

Woman exercising with hula hoop

Who Should Use Weight Gainers?

People who want to put on weight are typically the ones who find it hardest to do so. You might find weight gain challenging due to your lifestyle, fluctuating hunger level, or a high metabolism. With all these factors in mind, it becomes harder to fulfill your calorie needs.

You should use mass gainer supplements if you feel you’re doing your best to eat in a surplus and the scale’s not moving. Whether you’re a woman, a gym newbie, or an experienced bodybuilder, weight gainers will work just as well when used correctly. 

Pro Tip: Weight gainers for women tend to be lower calories, but women can use a smaller serving of any weight gainer they’d like for the same effect. 

Adding extra weight to your frame can help you perform better in the gym, put on muscle, feel better throughout the day, and create the physique you want. No matter your reasons for wanting to gain weight, a weight gainer can help.

With a thoughtfully formulated weight-gaining powder, you can put on weight without sacrificing your nutritional needs. Use Ultimate Nutrition’s IsoMass Xtreme Gainer® to put on the mass you want and achieve your biggest goals.

If you are a hard gainer, try Muscle Juice Revolution, the ULTIMATE weight gainer on the market. 

For those who opt for more natural sugar, try Muscle Juice 2544. This formula provides protein to constantly feed and nourish your muscles.

Remember to use what works best for your body and your routine. 

Ben Tuschman


This blog is highly informative as Weight gainers are a popular dietary supplement designed to help individuals increase their calorie intake and gain weight. Whether you’re an athlete aiming to build muscle mass or someone struggling with underweight issues, weight gainers can be a convenient and effective way to meet our nutritional goals.

— Greta Bose