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The Best Mass Gainers of 2021

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Best Proteins | Best Mass Gainers

When you're on a mission to put on weight, you need a one-two punch of calories and protein. If you're someone who struggles to put on weight, or who needs to gain it for a sport or a weight-classed competition, then you need both even more!

That's when a mass gainer can be your best friend. Like the best protein shakes, mass gainers (also known as weight gainers or gainer shakes) are full of muscle-building amino acids and protein, but they also add carbs and other nutrients to maximize your calorie and macro intake.

Adding a high-quality mass-gainer powder can make a huge difference in your bulking regimen. Here are 10 of the best, according to our experts and community members.

How We Choose the Best Mass Gainers

Our picks are informed by our team of fitness pros—athletes, nutrition professionals, and editors—and backed up by reviews from the people who know gainer shakes the best: you!

There are a few things that matter when you're looking for a good gainer shake:

  • Formula: It's important to choose a formula that has the numbers you need to support your goal, not just a bunch of fillers and poor-quality ingredients. Yes, a gainer is far more decadent than a traditional protein shake, but the label shouldn't make it feel like a candy bar in a glass.
  • Flavor: Gainers are there for you when you need nutrition but aren't necessarily hungry, so the more appealing they are, the easier it will be to keep downing them every day. Plus, gainer serving sizes tend to be significantly larger than a normal shake, so one that doesn't go down easily won't cut it!
  • Customer Ratings and Reviews: Our community members are some of the most discerning and honest anywhere, and that's why our ratings carry more weight—so to speak—than most online storefronts.
  • Value: The lowest priced gainer isn't always the best value! All of our best weight gainers factor in the price per serving.

The Best Mass Gainers

Best-Tasting Mass Gainer

RSP TrueGain Mass Gainer

  • Main ingredients: Maltodextrin, milk protein concentrate, whey protein concentrate
  • Rating: 9.0 out of 10
  • Reviews: 17
  • Calories: 1,210
  • Protein: 50g
  • Carbs: 241g
  • Sugar: 27g
  • Fat: 6g

TrueGain earns the distinction of a 9.9 flavor rating, an almost unheard-of seal of approval. Not only that, it packs a hefty 1,210 calories for muscle maintenance and growth with a short, simple ingredient list.

Combined, these factors make TrueGain one of the best all-around mass gainers, and a great choice for those who are just starting out with gainers. Use it as a post-workout recovery shake, a snack between meals, and pre-bedtime muscle insurance.

Flavors: Chocolate(9.9)

RSP Nutrition TrueGain Mass Gainer

RSP Nutrition TrueGain Mass Gainer
Crank up
weight gaining macro levels for hardgainers or bodybuilders looking to add lean muscle with this RSP mass gainer.


Highest-Calorie Mass Gainer

MHP Up Your Mass XXXL 1350

  • Main ingredients: Complex carbohydrate blend, whey protein concentrate, whey protein isolate, micellar casein, hydrolyzed whey protein, milk protein, BCAAs
  • Rating: 10 out of 10
  • Reviews: 3
  • Calories: 1,350
  • Protein: 50g
  • Carbs: 253g
  • Sugar: 11g
  • Fat: 17g

It stands to reason that a company known to be a fave of world-class strongman competitors and bodybuilders would make a rock-solid gainer. You can't beat the macros of Up Your Mass XXXL 1350: 1,350 calories, 250 grams of complex carbs, and 50 grams of protein in every great-tasting serving.

Pro tip: Since a serving is 6 scoops, it's easy to dial your serving size up or down based on your own personal body weight, goals, and preferences. Start with the tub, then refill it with the 12-pound bags to save money.

Flavors: Milk Chocolate (10), French Vanilla Crème (10), Cookies & Cream(no ratings)

MHP Up Your Mass XXXL 1350

MHP Up Your Mass XXXL 1350
A nutrient dense weight gainer loaded with 1350 calories per serving to assist with building size.


Highest-Protein Mass Gainer

Mutant Mass

  • Main ingredients: Carbohydrate blend, whey protein concentrate, hydrolyzed whey protein, whey protein isolate, micellar casein, milk protein concentrate and isolate
  • Rating: 8.5 out of 10
  • Reviews: 139
  • Calories: 1,100
  • Protein: 56g
  • Carbs: 192g
  • Sugar: 18g
  • Fat: 12g

Get ready to mutate with 56 grams of high-quality protein. Mutant Mass combines six types of protein to feed your muscles in the short, medium, and long term: whey concentrate, hydrolyzed whey, whey isolate, two types of milk protein, and casein.

This weight gainer also includes a solid amount of fiber from real food sources, such as sweet potatoes and rolled oats, to keep you carbed up and feeling good throughout your hardest training and bulking phase.

Flavors: Chocolate Fudge Brownie (9.6), Triple Chocolate (8.4), Strawberry Banana (8.1), Cookies & Cream(7.3)

Mutant Mass

Mutant Mass
Leave Humanity Behind! Gains In Muscle Mass!


Best Whey Blend Mass Gainer

Optimum Serious Mass

  • Main ingredients: Maltodextrin, whey protein concentrate, calcium caseinate, egg whites, sweet whey
  • Rating: 8.5 out of 10
  • Reviews: 1,152
  • Calories: 1,250
  • Protein: 50g
  • Carbs: 252g
  • Sugar: 20g
  • Fat: 4.5g

Serious Mass is a legend in the bulking game. It combines the muscle-building qualities of whey with casein and egg whites to provide additional amino acids and protect against muscle breakdown over time, as these proteins take longer to digest and be absorbed than whey.

In addition, this gainer shake is fortified with high levels of vitamins and minerals. When you're training hard you need more micronutrients, not just macronutrients, to fuel your bigger body and replenish what you sweat out and use up during heavy training. This formula helps ensure you're getting the nutrients you need, not just the calories.

Flavors: Chocolate Peanut Butter (8.9), Chocolate (8.4), Banana (7.9), Vanilla (7.5), Strawberry(6.9)

Optimum Nutrition Serious Mass

Optimum Nutrition Serious Mass
Loaded with 1,250 Calories, 250g of Carbs, & 25 Vitamins and Minerals to Pack on Pounds*


Best Mass Gainer for Hardgainers

Dymatize Super Mass Gainer

  • Main ingredients: Maltodextrin, whey protein concentrate, milk protein isolate, whey protein isolate, whey protein hydrolysate, micellar casein
  • Rating: 8.1 out of 10
  • Reviews: 212
  • Calories: 1,260
  • Protein: 52g
  • Carbs: 246g
  • Sugar: 24g
  • Fat: 9g

Sometimes the hardest thing about putting on weight is simply getting enough calories into your body, especially if you have a high metabolism or don't have a huge appetite. Super Mass Gainer is here to help.

The shake tastes smooth, mixes well, and our reviewers say it's very easy to drink. This is extremely helpful when you need to take in a lot of calories but just aren't hungry. Crucially, each serving of the formula's protein blend contains 5.2 grams of leucine, the branched-chain amino acid chiefly involved in turning on muscle protein synthesis.

Flavors: Gourmet Vanilla (8.4), Rich Chocolate (8.4), Cookies & Cream(7.8)

Dymatize Super Mass Gainer

Dymatize Super Mass Gainer
Engineered with enough protein, BCAAs, calories, and other nutrients to push athletes beyond their
muscle building, mass gaining macros based on Dymatize quality whey protein isolate so it mixes well and goes down easy, smooth, and clean.


Best Lactose-Free Mass Gainer

Isopure Mass

  • Main Ingredients: Maltodextrin, Ion exchange whey protein isolate
  • Rating: 9.2 out of 10
  • Reviews: 40
  • Calories: 600
  • Protein: 53g
  • Carbs: 86g
  • Sugar: 3g
  • Fat: 5g

True to the Isopure line, Isopure Mass is a super clean, easy-to-drink formula, but with far more calories and carbs than the brand's regular protein powders. This is a great choice if bulking has you feeling full and heavy all the time, or if you have a hard time with dairy.

Ion exchange whey protein isolate isn't your average whey; it's been stripped of fats and carbs and is designed to be entirely lactose free. It also means the shake isn't too thick, so our customers say it's extra chuggable. To increase the calorie count, blend it with peanut butter and honey.

Flavor: Dutch Chocolate(8.8)

Isopure Mass

Isopure Mass
Lactose Free! State Of The Art Gainer With 53 Grams Of 100% Ion Exchange Whey!


Best Clean Mass Gainer

Rivalus Clean Gainer

  • Main ingredients: Carbohydrate blend, whey protein concentrate, whey protein isolate, milk protein isolate, micellar casein
  • Rating: 9.1 out of 10
  • Reviews: 44
  • Calories: 560
  • Protein: 30g
  • Carbs: 90g
  • Sugar: 8g
  • Fat: 7g

It may taste like dessert and sugary breakfast cereal, but Clean Gainer is full of real food ingredients that fit your macros the clean way and give you plant-based benefits without having to break out the blender. The carbohydrates come from sources like organic quinoa and organic blueberry, while flaxseed, avocado, and MCTs punch up the healthy fats. Reviewers especially love the Chocolate Fudge flavor.

Flavors: Chocolate Fudge (9.4), Cinnamon Toast Cereal (8.5), Creamy Vanilla (8.2), Chocolate Peanut Butter (5.0), S'mores(4.0)

RIVALUS Clean Gainer Protein

RIVALUS Clean Gainer Protein
Ideal For Between Meals And Before Bed To Feed Muscles And Gain Weight


Best Meal Replacement Mass Gainer

BSN True Mass Weight Gainer

  • Main ingredients: Whey protein concentrate, calcium caseinate, milk protein isolate, whey protein isolate, micellar casein, hydrolyzed whey protein, egg whites, maltodextrin
  • Rating: 9.1 out of 10
  • Reviews: 591
  • Calories: 710
  • Protein: 50g
  • Carbs: 90g
  • Sugar: 15g
  • Fat: 17g

True-Mass is another revered gainer by a trusted brand backed with hundreds of reviews. The highly rated flavors let you know by their names how decadent they taste. This is a shake you'll look forward to.

To optimize gains, you should be eating healthy meals contain balanced amounts of all the macronutrients, not just protein. This formula has the right amounts of protein, carbs, and fat—plus plenty of fiber—to give your body what it needs to grow when you don't have time to cook and eat.

Flavors: Chocolate Milkshake (9.2), Strawberry Milkshake (9.1), Vanilla Ice Cream (9.0), Cookies & Cream(7.5)

BSN True-Mass Weight Gainer

BSN True-Mass Weight Gainer
A true mass gainer for athletes who need a higher caloric intake to build muscle and add weight with improved macros for gains.


Best Value Mass Gainer

Signature Mass Gainer

  • Main ingredients: Maltodextrin, whey protein isolate, milk protein concentrate, whey protein concentrate, micellar casein, egg whites
  • Rating: 8.1 out of 10
  • Reviews: 22
  • Calories: 810
  • Protein: 50g
  • Carbs: 133g
  • Sugar: 8g
  • Fat: 10g

Results require consistency, and consistency requires time. This means if you're looking to add appreciable weight, you'll probably be going through more than one tub of a gainer, so you want to be sure you're getting a good deal on each one.

Signature Mass Gainer is a great value to begin with, but gets even better since BodyFit members can stack extra discounts every day.

Unlike some other "value" mass gainers, Signature's ingredients are solid and stand up to scrutiny. In addition to an ideal macronutrient profile with relatively low sugar content, the filler-free formula includes probiotics for digestive health support—always a plus when you're bulking.

Flavors: Vanilla (8.1), Chocolate(no ratings) Signature Mass Gainer Signature Mass Gainer
Protein, Calories, and Carbs to Put On Serious Size


Should I Take a Mass Gainer?

Anyone can go to the gym and improve their fitness, but adding significant muscle mass to your body can be surprisingly difficult. When it comes down to it, it's just hard to shovel in the ultra-high levels of nutrients and calories you need from food alone—and in the right ratio of protein, carbs, and fats to grow muscle and not just pack on body fat. If you're lifting weights but not feeding your muscles adequately, they probably aren't going to grow.

Weight-gainer shakes make it easy to gulp down a lot of calories very quickly. (So do milkshakes and soda, but they won't give you the clean gains you're after.) Supplementing a healthy, plentiful diet with a mass gainer is your best bet to make sure your body is working up to its muscle-building potential.

Just remember, a well-designed muscle-gain training program is essential to help put those calories to good use. These are the ones our community swears by:

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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Jake Anderson
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