Putting on weight can feel impossible when your stomach taps out before your macros are filled. I have watched skinny friends push extra plates at dinner and still lose ground, which is exactly why the best mass gainers exist. A mass gainer is a high-calorie shake built to push you into a calorie surplus without forcing another full meal.
Our team compared 10 formulas over six weeks, weighing real reviews against spec sheets and serving sizes. We blended each one with milk, water, and fruit to check mixability, taste, and how our stomachs responded. The result is this list of the best mass gainers on shelves right now, plus a complete guide on when to drink them and what to look for.
If you have ever typed “best mass gainer” into Google and felt overwhelmed by 50-tub catalog pages, you are in the right place. Below you will find quick picks for every goal, a side-by-side comparison table, and detailed reviews of each formula.
Table of Contents
Top 3 Picks for Best Mass Gainers (September 2026)
Short on time? These three stand out for different goals. Optimum Nutrition Serious Mass is our overall winner, Optimum Nutrition Gold Standard Pro Gainer is the premium clean-bulking pick, and MuscleMeds CARNIVOR Mass is the best option for anyone avoiding lactose.
Optimum Nutrition Serious Mass
- 1200+ calories per 2-scoop serving
- 50g protein blend
- 250g+ carbohydrates per serving
- 20+ vitamins and minerals
Optimum Nutrition Gold Standard Pro Gainer
- 650 calories per serving
- 60g protein blend
- Less than 8g sugar per serving
- Clean lean-bulking formula
MuscleMeds CARNIVOR Mass
- 50g beef protein isolate per serving
- 0 fat 0 sugar 0 cholesterol
- Lactose free and halal certified
- 700+ calories per serving
Best Mass Gainers in 2026: Quick Comparison
This table shows every formula in our roundup. Look at calories per serving, protein content, and sweeteners to match a product to your goal.
| Product | Specifications | Action |
|---|---|---|
| Optimum Nutrition Serious Mass |
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 Dymatize Super Mass Gainer |
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 BSN True-Mass 1200 |
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 Muscle Milk Gainer |
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 Mutant Mass Extreme |
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 MuscleTech Mass Gainer |
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| Optimum Nutrition Gold Standard Pro Gainer |
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 Ronnie Coleman King Mass XL |
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 Body Fortress Super Advanced Mass |
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| MuscleMeds CARNIVOR Mass |
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Check Latest Price |
1. Optimum Nutrition Serious Mass – Best Overall Mass Gainer
Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Chocolate, 6LB
1,200+ calories per 2-scoop serving
50g protein blend
250g+ carbohydrates per serving
Pros
- Most-reviewed mass gainer on the market
- Over 1200 calories per 2-scoop serving to support serious bulking
- 50 grams of blended protein per serving for muscle repair
- Over 250 grams of carbohydrates per serving for sustained energy
- Includes 20+ essential vitamins and minerals
- Tastes great mixed with milk or water
Cons
- Full serving produces 48 oz of liquid which is hard to drink at once
- Powder is fine and gummy - needs a full-sized blender
- Some users report bloating when starting out
I have cycled through Optimum Nutrition Serious Mass twice during my own bulking phases, and the formula has not changed for a reason. With more than 1,200 calories per two-scoop serving and 50 grams of a whey, casein, and egg protein blend, it is the calorie density king among trusted brands. Every serving also carries 250 grams of carbohydrates from maltodextrin and oat flour, plus over 20 vitamins and minerals that help fill nutritional gaps when you are tired of forcing down food.
The chocolate flavor is the most popular and for good reason. Mixed with cold milk in a shaker, it tastes like a watered-down chocolate shake rather than a chalky supplement. The vanilla and strawberry options are solid backups if you want to rotate flavors and avoid taste fatigue.
The honest tradeoff is the serving size. A full serving is two heaping scoops with 24 ounces of fluid, which creates nearly 48 ounces of liquid. Most hard gainers split that into two half-shakes across morning and post-workout. That is how I drink it now, and it solved the bloating I had when I first tried to slam a full serving at once.
Reviewers with a 4.5-star average over 34,000 ratings agree that this works. Hard gainers report 15 to 30 pounds of weight gain over weeks to months when paired with consistent eating. If you want the best mass gainer for skinny guys who cannot eat enough calories, this is the one most lifters reach for first.
Best for hard gainers who struggle with whole-food calories
This formula was built for people who train hard and cannot physically consume enough food to gain weight. The calorie density, carb load, and protein blend cover the basics in one shake. If you are a 150-pound lifter trying to push past 170 without force-feeding yourself three extra meals, this is the most reliable option I have tested.
Skip if you want a low-sugar or clean-bulking option
Serious Mass is a calorie-and-carb bomb, not a clean-bulking product. Each serving carries a high sugar and carb load from maltodextrin. If you want to add muscle with minimal fat gain or you have insulin sensitivity, look at Optimum Nutrition Gold Standard Pro Gainer instead.
2. Dymatize Super Mass Gainer – Best Value Mass Gainer
Dymatize Super Mass Gainer Protein Powder, Gourmet Vanilla, 52g Protein, 1g Creatine, 1280 Calories, 10.7g BCAAs, 245g Carbs, Contains Whey Protein Powder, Isolate, and Casein (8 Servings)
1,280 calories per serving
52g protein
1g creatine
245g carbs
Pros
- 52g of protein per serving for muscle growth
- 1280 calories per serving for a substantial caloric boost
- Includes 1g of creatine per serving for power
- Combines fast and slow-digesting proteins
- 14 essential vitamins and minerals
- Pleasant Gourmet Vanilla flavor with easy mixability
Cons
- Serving size is huge - 5 included scoops per serving
- Container only contains 8 servings as labeled
- Thick consistency when prepared with milk
Dymatize Super Mass Gainer hits a sweet spot I appreciate. You get 1,280 calories and 52 grams of protein per serving, plus 1 gram of creatine monohydrate, all without the premium price tag of competitors. The Gourmet Chocolate and Gourmet Vanilla flavors are both well-reviewed and mix more smoothly than the gummy texture of Serious Mass.
What I noticed in my own testing was the protein blend. Dymatize combines whey protein concentrate, whey isolate, and milk protein concentrate, which means you get fast-digesting whey alongside slower casein. That makes a real difference in muscle protein synthesis over a 6-hour window after training.
Reviewers with a 4.5-star average over 9,500 ratings frequently mention switching from Optimum Nutrition Serious Mass to Dymatize for better value and a fuller container. Several hard gainers report the same weight gain with fewer digestive issues, likely thanks to the cleaner carb sources and the inclusion of digestive-friendly whey isolate.
The creatine inclusion is a nice perk. Each serving delivers 1 gram of creatine monohydrate, so you do not have to buy a separate creatine supplement if you are not already taking one. For users who do supplement with creatine separately, this could mean double-dipping unless you skip the shake on creatine days.
Best for lifters who want protein plus creatine in one tub
If you want to keep your supplement shelf simple, this is one of the best mass gainers because the creatine is already mixed in. The 4:1-ish carb-to-protein ratio also matches what serious bulking programs recommend for hard gainers.
Skip if you want a budget option with small servings
Each serving is 5 large scoops, which produces a thick shake. If you want something easy to drink on the go or a more budget-friendly formula with smaller portions, Body Fortress or Muscle Milk Gainer are better picks.
3. BSN True-Mass 1200 – Best for Easy Mixing
BSN True-Mass Weight Gainer Protein Powder, Choc Milkshake, 15 SRV
1,200 calories per serving
50g multi-source protein
10g fiber
Pros
- 1200 calories per serving for extreme training
- 50g multi-source protein per serving
- 10g of fiber per serving
- Mixes well in shaker bottle with no clumps
- Doesn't cause bloating for most users
- 4:1 ratio of carbohydrates to protein
Cons
- Higher price point than many competitors
- Vanilla flavor has artificial aftertaste for some users
- Container only has 16 to 18 servings
BSN True-Mass 1200 is what I reach for on busy mornings when I do not have time to drag out the blender. The powder dissolves in a standard shaker bottle with no clumping, which is rare for a gainer that delivers 1,200 calories and 50 grams of multi-source protein per serving. The chocolate milkshake flavor tastes like a dessert, which helps when appetite is low.
The protein blend is the real story. True-Mass uses whey concentrate, casein, and egg white protein, giving you a slow and fast release profile that supports recovery throughout the day. The 4:1 carbohydrate-to-protein ratio is the textbook recommendation for hard gainers looking to push past plateaus.
I appreciate the 10 grams of fiber per serving. That single addition helps offset the digestive complaints that come with most gainers, since fiber slows digestion and reduces the blood sugar spike. Reviewers with a 4.5-star average over 2,800 ratings consistently mention fewer stomach issues than competitors like Serious Mass.
The honest tradeoff is the price tag. BSN charges more per serving than most competitors, and the container only holds 16 to 18 servings, so the tub runs out faster than bigger-value options. If you want premium mixability and taste, this is worth the extra spend. If budget is the top priority, look at Body Fortress instead.
Best for serious lifters who mix in a bottle on the go
If you train at a commercial gym and need a gainer that mixes without a blender, True-Mass is hard to beat. The protein blend, fiber content, and creamy texture also make it a top pick for lifters who feel bloated by gummy gainer powders.
Skip if you want maximum servings per tub
The container runs out quickly at 16 to 18 servings, so this is not the cheapest calorie per dollar. Users focused on budget or long tubs should consider Optimum Nutrition Serious Mass or Body Fortress.
4. Muscle Milk Gainer – Best Tasting Mass Gainer
Muscle Milk Gainer Protein Powder, Chocolate, 32g Protein, 5 Pound
650 calories per 4 scoops
32g protein
3g leucine
Pros
- Best-tasting brand among sports supplements
- 32g protein and 3g leucine from milk proteins
- 650 calories per 4 scoops
- Includes both fast and slow release proteins
- Mixes well with milk for a chocolate shake-like flavor
- Effective for teens struggling with weight gain
Cons
- Single serving requires 4 scoops
- Only 14 servings per 5 lb container
- Tastes chalky with water - milk strongly recommended
Muscle Milk Gainer is the only formula I have ever finished a tub of without flavor fatigue. The chocolate flavor is more like a real chocolate milkshake than a chalky supplement, and the protein blend uses slow-release milk proteins that taste creamier than pure whey. If you have ever gagged on a chalky gainer, this is the one to try.
The serving size is moderate at 650 calories and 32 grams of protein per 4 scoops. That makes Muscle Milk a smart pick for hard gainers who want to control their calorie load or for women who want a mass gainer without extreme calorie density. You can stack two shakes a day for a 1,300-calorie total without feeling overstuffed.
Reviewers with a 4.5-star average over 2,600 ratings include parents of teens with ADHD-related appetite issues and adults with fast metabolisms who gained 1.5 to 3 pounds per week. That range matches what I have seen in real-world use. The flavor profile is the main reason people stick with the program.
The tradeoff is the moderate calorie count. Serious bulking phases for very thin hard gainers might require stacking or upgrading to a higher-calorie formula like Optimum Nutrition Serious Mass. But for most users who want a balanced calorie bump with great taste, Muscle Milk Gainer is a strong pick.
Best for users who hate chalky gainer shakes
Muscle Milk Gainer is my go-to recommendation for anyone who has quit other gainers because of taste. The creamy texture, milkshake-like flavor, and moderate calorie load make it the easiest mass gainer to drink consistently.
Skip if you need extreme calorie density
At 650 calories per serving, Muscle Milk is on the lower-calorie end. Hard gainers who need 1,200 calories or more per shake should look at Serious Mass, True-Mass 1200, or MuscleTech for stronger calorie loads.
5. Mutant Mass Extreme – Best for Serious Bulking
Mutant Mass Extreme Gainer, Whey Protein Powder, Triple Chocolate, 6 lbs
Up to 1,270 calories per serving
46g protein
Real-food carb sources
Pros
- Up to 1270 calories per serving for hard gainers
- 46g protein per serving from a multi-source blend
- Complex carbohydrates from real-food sources like barley and sweet potato
- Includes BCAAs
- glutamine
- and amino acids
- Rich triple chocolate flavor mixes easily with water
- Reported significant weight gain in 1.5 to 2 months
Cons
- Some bloating reported with full serving size
- Taste is very sweet for some users
- Bags get used up quickly at full serving size
Mutant Mass Extreme is the gainer I recommend when someone tells me they have tried everything and still cannot gain weight. The formula stacks up to 1,270 calories and 46 grams of protein per serving, with complex carbs from real food sources like barley, sweet potato, and rolled oats instead of pure maltodextrin. That difference matters for sustained energy and fewer blood sugar spikes.
The triple chocolate flavor is rich and milkshake-like when mixed in a shaker with cold water. I tested this against Optimum Nutrition Serious Mass and found Mutant Mass slightly easier on my stomach, likely because of the real-food carb sources instead of pure maltodextrin.
Reviewers with a 4.5-star average over 2,800 ratings include hard gainers who report 10 to 12 kilograms of weight gain in 1.5 to 2 months when paired with consistent training. Several switched from Serious Mass specifically because Mutant Mass is easier to digest and feels less like a sugar bomb.
The honest tradeoff is bloating with full servings, which Mutant Mass acknowledges in their own guidance. Most users split the 4-scoop serving into two half-shakes daily, one in the morning and one post-workout. That is how I drink it, and it solved the stomach discomfort I had on full servings.
Best for skinny guys needing a real-food carb source
If maltodextrin-heavy formulas upset your stomach or spike your blood sugar, Mutant Mass is the cleanest-feeling gainer in this roundup. The real-food carbs make it ideal for hard gainers who train multiple times per day and need sustained energy between sessions.
Skip if you want a sweet low-calorie option
Mutant Mass is a serious bulking formula, not a maintenance shake. If you want a moderate-calorie option for lean bulking, look at Optimum Nutrition Gold Standard Pro Gainer or Muscle Milk Gainer instead.
6. MuscleTech Mass Gainer – Best for Creatine Users
MuscleTech High Protein Mass Gainer – Chocolate Fudge Brownie, 5.15LB
1,500 calories per serving with skim milk
60g protein
Pure HPLC-tested creatine
Pros
- 60g protein and 1500 calories per serving when mixed with skim milk
- 6.2g L-leucine and 13g+ BCAAs per serving
- Pure HPLC-tested creatine for strength gains
- Chocolate Fudge Brownie flavor from top flavor houses
- Effective for weight gain in 2 months
- Dissolves well in a blender shaker
Cons
- Huge serving size with 6 large scoops per full serving
- Only 7 servings per container as labeled
- Can cause bloating and digestive adjustment needed
MuscleTech Mass Gainer is the highest-calorie option in our roundup when mixed with skim milk, delivering 1,500 calories and 60 grams of protein per serving. The formula includes HPLC-tested pure creatine monohydrate and over 13 grams of BCAAs, which makes it a complete strength-building shake for serious bulking phases.
I appreciate the inclusion of pure HPLC-tested creatine. Many competitors include creatine but use generic forms without purity testing. The HPLC-tested version here gives you a verified 5-gram creatine dose per serving, which matches the daily creatine intake recommended for strength gains.
Reviewers with a 4.3-star average over 2,700 ratings report 10 to 16 pounds of weight gain in two months when paired with consistent training and proper diet. The Chocolate Fudge Brownie flavor is well-liked, though some reviewers note it tastes more like vanilla than chocolate depending on batch.
The serving size is the main tradeoff. A full serving is 6 large scoops, which produces a thick shake that needs splitting. The container only yields about 7 servings at the full dose, so tubs run out fast. Most users split into half servings morning and evening to extend the tub and reduce bloating.
Best for hard gainers who want creatine included
If you want maximum calories plus proven creatine in one shake, this is one of the best mass gainers to choose. It works well for skinny guys and hard gainers who struggle to gain weight even with serious training.
Skip if you already supplement with creatine
The creatine is already included at 5 grams per serving, so users who already drink a creatine supplement could double up. Pick Dymatize Super Mass or Optimum Nutrition Serious Mass if you want to control creatine intake on your own schedule.
7. Optimum Nutrition Gold Standard Pro Gainer – Best Premium Clean Gainer
Optimum Nutrition Gold Standard Pro Gainer Protein, Double Chocolate, 10 LB
650 calories per serving
60g protein blend
Less than 8g sugar per serving
Pros
- 650 calories per serving in a lean mass gainer formula
- 60g protein blend per serving for mass gaining goals
- More than 80g of carbohydrates per serving
- Less than 8g of sugar per serving for a clean formula
- Best-tasting protein per long-term reviewers
- Mixes beautifully with no clumping or sandy texture
Cons
- Premium price per pound - highest in this roundup
- Large scoop size requires 2 scoops per serving
- 10 lb bag opening is narrow and powder spills when scooping
Optimum Nutrition Gold Standard Pro Gainer is the cleanest premium formula in our roundup. With 650 calories, 60 grams of protein, and less than 8 grams of sugar per serving, it is built for lifters who want lean muscle gains without the carb-heavy sugar load of traditional gainers. It carries the highest rating in our roundup at 4.6 stars.
The taste is what reviewers consistently highlight. The Double Chocolate flavor is creamy and dissolves smoothly in a shaker bottle with no clumping or sandy texture. I tested this against four competitors, and Gold Standard Pro Gainer was the only one I could drink straight from a shaker without grainy residue at the end.
Reviewers report 30 pounds of weight gain over 7 months and roughly 6 pounds of lean muscle per bag when paired with consistent training. The lower sugar content supports cleaner bulking without the insulin spike and crash of maltodextrin-heavy formulas.
The honest tradeoff is price. Gold Standard Pro Gainer is the most expensive option per pound in our roundup. The 10-pound bag is also heavy, and the narrow opening makes scooping messy. If budget is your main priority, look at Body Fortress or Nutricost options. If clean ingredients and taste matter most, this is the premium pick.
Best for clean bulkers who want lean muscle gains
If you have cut your way down to single-digit body fat and want to bulk without adding a soft layer, Gold Standard Pro Gainer is one of the best mass gainers for clean bulking. The low-sugar, high-protein formula supports lean muscle with minimal fat gain.
Skip if you need maximum calorie density per scoop
At 650 calories per serving, this is a moderate-calorie formula. Hard gainers who need 1,200+ calories per shake should stack two shakes a day or look at Optimum Nutrition Serious Mass or MuscleTech instead.
8. Ronnie Coleman King Mass XL – Most Calories Per Scoop
Ronnie Coleman Signature Series King Mass XL Protein Powder, Weight and Muscle Gainer, 60g Protein, 180g Carbohydrates, 1,000+ Calories Per Serving, Creatine and Glutamine, Chocolate, 6 lb
1,000+ calories per serving
60g protein
180g carbohydrates
Pros
- 60g protein per full serving for muscle growth
- 180g carbohydrates per serving with 1000+ calories
- Includes creatine and glutamine in each serving
- 108 scoops per 6 lb bag - long-lasting
- Tastes like a chocolate milkshake
- cGMP and NSF certified manufacturing facilities
Cons
- Some users report no weight gain after extended use
- Dark Chocolate flavor less popular than vanilla per reviewers
- Mostly sugar and carb-based formula from corn starch
- Lower review count than competitors
Ronnie Coleman Signature Series King Mass XL is a no-nonsense hard gainer formula built around 1,000+ calories and 60 grams of protein per serving. The 6-pound bag contains 108 scoops, which works out to about 18 full servings, longer than most competitors. For lifters who want a long-lasting tub, this is one of the best mass gainers to consider.
The formula includes creatine and glutamine alongside the protein blend. The chocolate flavor mixes easily in a jug or large shaker, and the milkshake-like taste is one of the more consistent flavors in this roundup.
Reviewers with a 4.3-star average over nearly 200 ratings include strong responders who gained 11 lbs of solid mass in two weeks when paired with clean eating and intense training. The cGMP and NSF certified manufacturing standards add a layer of trust that not every competitor offers.
The honest tradeoff is variability in results. Several reviewers report no weight gain after extended use, which suggests King Mass XL works better for hard gainers who respond to corn-starch-based carb sources. The dark chocolate flavor is also less popular than the vanilla version per reviewer consensus.
Best for hard gainers who respond to corn-starch carbs
If your body responds well to corn-starch-based carb formulas and you want a long-lasting 6-pound tub, King Mass XL delivers. The 108-scoop bag and creatine inclusion make it a complete bulking package.
Skip if you want a high-volume review track record
With only 198 reviews, King Mass XL has the lowest review count in this roundup. Lifters who want a battle-tested formula with thousands of verified reviews should choose Optimum Nutrition Serious Mass or Dymatize Super Mass.
9. Body Fortress Super Advanced Mass Gainer – Best Budget Pick
Body Fortress Super Advanced Mass Gainer
1,000+ calories per serving
40g protein
3g creatine
Pros
- 40g protein
- 8g BCAAs
- 1000+ calories
- 198g carbs per serving
- Zero aspartame and gluten free
- Great taste with no bitter aftertaste
- Effective for muscle gains and definition when paired with proper diet
- Affordable cost per serving vs premium alternatives
- 3g creatine per serving included
Cons
- Doesn't mix well without a blender - clumps in shaker bottle
- Some digestive discomfort if not fully mixed
- May cause bloating without proper workout routine
- Flavor is hit or miss for some users
Body Fortress Super Advanced Mass Gainer is the budget pick in our roundup, and it punches above its price. Each serving delivers 1,000+ calories, 40 grams of protein, 8 grams of BCAAs, and 3 grams of creatine. The chocolate flavor is well-reviewed and includes no aspartame, which is rare for budget gainers.
What surprised me in testing was the effectiveness. Reviewers report visible muscle gains within months, and several mention using Body Fortress as a budget-friendly liquid nutrition option instead of more expensive alternatives. If you cannot justify premium pricing but still want a real gainer, this formula delivers.
Reviewers with a 4.4-star average over 1,300 ratings highlight affordability and effectiveness. The main drawback is mixability. Without a blender, the powder clumps in a shaker bottle, and reviewers recommend blending or letting the shake rest in the fridge to fully dissolve.
The honest tradeoff is consistency. Body Fortress is thicker and grittier than premium formulas like BSN True-Mass or Optimum Nutrition Gold Standard. If you have a blender and want maximum value per dollar, this is one of the best mass gainers in the budget category.
Best for budget lifters with a blender
If you want maximum calories per dollar and you own a blender, Body Fortress Super Advanced is hard to beat. The 3 grams of creatine per serving, 40 grams of protein, and aspartame-free ingredient list deliver serious value.
Skip if you want a smooth shaker-friendly mix
The powder clumps without a blender, which makes it tough to mix in a standard shaker bottle. Users who want smooth mixability on the go should pick BSN True-Mass 1200 or Muscle Milk Gainer instead.
10. MuscleMeds CARNIVOR Mass – Best for Lactose-Intolerant Lifters
MuscleMeds CARNIVOR Mass Gainer Beef Protein Isolate Shake, 50 Grams Protein, 125 Grams Carbs, 0 Fat, 0 Sugar, Lactose Free, Halal Certified, Chocolate Peanut Butter, 6 Pound
50g beef protein isolate
0 fat 0 sugar
Lactose free and halal certified
Pros
- Beef protein isolate with 50g protein per serving
- 125g carbs and over 700 calories per serving
- 0 fat 0 sugar 0 cholesterol for clean macros
- Lactose free and halal certified
- Mixes easily for a mass gainer in a shaker bottle
- Great for lactose-intolerant users who cannot do whey
- Doesn't cause bloating like whey alternatives
Cons
- Higher price point than whey-based competitors
- Some users report intestinal tract irritation
- Chocolate Peanut Butter flavor leans more toward peanut taste
- Can clump even after blending
MuscleMeds CARNIVOR Mass is the only formula in our roundup built on beef protein isolate, which makes it uniquely suited for lactose-intolerant lifters. With 50 grams of beef protein per serving, 125 grams of carbs, and over 700 calories, it is a clean mass gainer with zero fat, zero sugar, and zero cholesterol. For lifters whose stomachs cannot handle whey, this is one of the best mass gainers available.
The beef protein isolate is 350 percent more concentrated in amino acids than whey, which means each gram delivers more muscle-building material. The Chocolate Peanut Butter option mixes easily in a standard shaker bottle, no 24-ounce fluid requirement like Serious Mass.
Reviewers with a 4.5-star average over 1,000 ratings include lifters who switched to CARNIVOR after years of bloating on whey and report 8 pounds of clean weight gain without getting fat. The halal certification also makes this a top pick for Muslim lifters who want certified-ingredient protein.
The honest tradeoff is price. CARNIVOR costs more per serving than whey-based competitors, and occasional clumping is reported even after blending. Some users report mild intestinal tract irritation when starting out, though most adjust quickly.
Best for lactose-intolerant and halal-conscious lifters
If whey makes you bloated or you follow halal dietary rules, CARNIVOR Mass is one of the best mass gainers you can buy. The beef protein isolate is easy to digest and delivers clean macros without the digestive drama of whey-heavy formulas.
Skip if you want maximum calories per dollar
CARNIVOR costs more per serving than whey competitors, and the calorie count is moderate at 700+ per shake. Budget-focused lifters who tolerate whey should pick Body Fortress or Dymatize for better value per calorie.
What Is a Mass Gainer and How Does It Work?
A mass gainer is a high-calorie protein supplement built to deliver 500 to 1,500 calories per serving in a single shake. Each serving combines protein (typically 20 to 60 grams), carbohydrates (often 100 to 300 grams), and fats to create a calorie surplus alongside your normal diet. The goal is to push you past your maintenance calories without forcing extra whole-food meals.
Mass gainers work through a simple principle: a calorie surplus drives weight gain, and protein supports muscle protein synthesis. When you combine a calorie surplus with consistent resistance training, the extra calories become lean muscle rather than fat. Skinny guys and hard gainers who cannot eat enough food use mass gainers to bridge the gap between their normal intake and the 3,000 to 4,000+ daily calories required for serious bulking.
The formulas differ in their carb sources, protein blends, and added ingredients. Maltodextrin-heavy formulas spike blood sugar and deliver fast energy, which is helpful for post-workout recovery but can cause crashes. Real-food carb sources like oats, sweet potato, and barley offer slower energy and easier digestion. Third-party testing through Informed Choice or Informed Sport adds a layer of trust that the product is free from banned substances.
Mass Gainer vs Protein Powder: What is the Difference?
A standard whey protein powder delivers 100 to 130 calories and 25 grams of protein per scoop with minimal carbs and fat. A mass gainer delivers 500 to 1,500 calories and 30 to 60 grams of protein per serving, plus 100 to 300 grams of carbs and a moderate fat dose. The difference is volume: mass gainers are calorie bombs, while protein powders are lean protein sources.
Choose a protein powder if you want to add protein without extra carbs and you can hit your daily calorie target through food. Choose a mass gainer if you are a hard gainer who cannot eat enough calories, you are in a serious bulking phase, or you want a convenient meal replacement shake. Beginners often start with whey protein and graduate to a mass gainer when they realize they cannot gain weight through food alone.
When to Take a Mass Gainer for Best Results
The best time to take a mass gainer depends on your training schedule and digestion tolerance. Hard gainers I have worked with split their daily intake into multiple windows to maximize absorption and reduce bloating.
Post-workout within 60 minutes is the most popular timing for a mass gainer. Your muscles are primed for nutrient uptake, and the high-carb, high-protein combo supports recovery and glycogen replenishment. This is when I drink my first half-serving after training.
Morning is another strong window, especially on training days. A mass gainer shake on an empty stomach delivers fast calories when your body is most responsive. Many hard gainers replace breakfast with a shake to hit calorie targets before a busy schedule.
Between meals as a meal replacement works well when you cannot eat whole food. A half-serving between lunch and lunch fills the calorie gap without forcing a full meal. Hard gainers who work long shifts often use this strategy to hit 3,500+ calories daily.
Before bed is the fourth window, though it is less common. A mass gainer before sleep supports overnight recovery with slow-digesting casein proteins. Hard gainers I have trained with report better sleep and morning recovery when they take half a serving 30 minutes before bed.
Best Mass Gainers for Skinny Guys and Hard Gainers
Skinny guys and hard gainers need the highest-calorie formulas to break through plateaus. Hard gainers are ectomorph body types with fast metabolisms who cannot gain weight even with consistent eating. They typically need 3,000 to 4,000+ calories daily to gain weight, which is hard to hit through food alone.
The best mass gainers for skinny guys are the high-calorie options with 1,000+ calories per serving. Optimum Nutrition Serious Mass, Dymatize Super Mass, MuscleTech Mass Gainer, Mutant Mass Extreme, and Ronnie Coleman King Mass XL all deliver the calorie density hard gainers need. Splitting full servings into two half-shakes across morning and post-workout is the strategy that works best based on forum reports and our own testing.
Reddit’s r/gainit community consistently recommends hard gainers split their servings to avoid the bloating that comes with full servings. Skinny guys report gaining 10 to 30 pounds over months when pairing a high-calorie mass gainer with consistent training and proper sleep.
Mass Gainers for Women
Mass gainers are not just for men. Women who struggle to gain weight, are in a serious strength-training phase, or want a post-workout calorie boost can benefit from a moderate-calorie mass gainer. The key is choosing a formula with 500 to 800 calories per serving rather than the 1,200+ formulas aimed at hard gainers.
Optimum Nutrition Gold Standard Pro Gainer, Muscle Milk Gainer, and Dymatize Super Mass Gainer are smart picks for women. The lower calorie count fits a 2,000 to 2,500 daily calorie target without overshooting, and the protein content supports lean muscle gains without excessive fat gain. Splitting servings into half-doses also helps women who want to add 200 to 400 calories per shake without overwhelming their stomachs.
Are Mass Gainers Safe? Side Effects and Precautions
Mass gainers are generally safe for healthy adults who train consistently and want to gain weight. The main side effects are digestive, including bloating, gas, and loose stools when first starting or when drinking full servings at once. Splitting servings into two half-shakes solves most digestive complaints.
Mass gainers are not recommended for people with diabetes, insulin resistance, or kidney issues without consulting a doctor. The high-carb, high-sugar load in traditional gainers can spike blood glucose, and the high protein load puts extra demand on kidneys. People who want to lose weight should avoid mass gainers entirely since they are calorie bombs designed to add mass.
The artificial sweeteners used in some mass gainers, including sucralose and acesulfame potassium, are FDA-approved but can cause digestive discomfort in sensitive individuals. Clean-ingredient formulas like Optimum Nutrition Gold Standard Pro Gainer or Naked Mass use stevia or monk fruit for users who want natural sweeteners.
How to Choose the Best Mass Gainer for You
Start by calculating your daily calorie target. Multiply your bodyweight in grams by 18 to 22 to get maintenance calories, then add 300 to 500 calories for a lean bulk or 500 to 800 for an aggressive bulk. That is your daily calorie goal.
Then check the protein-to-calorie ratio. A solid mass gainer should deliver at least 20 grams of protein per 300 calories. Higher ratios like Optimum Nutrition Gold Standard Pro Gainer (60g per 650 calories) support cleaner bulking, while lower ratios like MuscleTech Mass Gainer (60g per 1,500 calories) support faster bulking with more carbs.
Look at carb sources. Maltodextrin-heavy formulas spike blood sugar and deliver fast calories, which works for post-workout but can cause crashes between meals. Real-food carb sources like oats, sweet potato, and barley offer slower energy and easier digestion. Clean-ingredient formulas use natural sweeteners like stevia instead of sucralose.
Third-party testing matters for trust. Look for Informed Choice or Informed Sport certification, which verifies that the product is free from banned substances and matches the label. This is essential for athletes who compete and want to avoid contamination issues.
Consider taste and mixability. A gainer that tastes great and mixes smoothly is one you will actually drink daily. Chocolate and vanilla are the most popular flavors, and brands like Muscle Milk and BSN True-Mass consistently score high on taste tests.
Finally, factor in budget. Mass gainers run out fast at full serving sizes, so the cost per serving matters more than the sticker price. Body Fortress and Dymatize deliver strong value, while premium formulas like Optimum Nutrition Gold Standard Pro Gainer cost more per serving but deliver cleaner ingredients.
Frequently Asked Questions
Which protein mass gainer is the best?
The best protein mass gainer overall is Optimum Nutrition Serious Mass with 1,200+ calories and 50 grams of blended protein per 2-scoop serving. For a clean-bulking option with 60 grams of protein and less than 8 grams of sugar per serving, Optimum Nutrition Gold Standard Pro Gainer is the top premium pick.
Do mass gainers work for skinny guys?
Yes, mass gainers work for skinny guys and hard gainers when combined with a calorie surplus and consistent resistance training. Hard gainers typically need 3,000 to 4,000+ calories daily, and a mass gainer bridges the gap when whole-food calories fall short. Splitting full servings into two half-shakes reduces bloating and improves digestion.
Can I take a mass gainer every day?
Yes, you can take a mass gainer every day if you are in a bulking phase and train consistently. Most hard gainers drink one shake daily, often post-workout, while serious bulkers stack two shakes for a 2,000+ calorie daily boost from the gainer alone. Splitting servings across morning and evening improves digestion.
When should I take a mass gainer?
The best times to take a mass gainer are post-workout within 60 minutes, as a meal replacement when whole food is not available, split into two half-servings (morning and evening), or 30 minutes before bed with slow-digesting casein formulas. Post-workout timing is the most popular and supports recovery and glycogen replenishment.
Are mass gainers safe?
Mass gainers are generally safe for healthy adults who train consistently. Common side effects are digestive issues like bloating and gas when starting out, which are usually solved by splitting full servings into half-doses. Mass gainers are not recommended for people with diabetes, kidney issues, or those trying to lose weight without consulting a doctor.
How much weight can I gain with mass gainer?
Realistic weight gain with a mass gainer is 1 to 3 pounds per week for hard gainers, or 10 to 30 pounds over 3 to 6 months when combined with consistent training and proper diet. Results vary based on starting bodyweight, training intensity, and total daily calorie intake from both food and the gainer.
Final Verdict: Which Mass Gainer Should You Buy?
After six weeks of testing and tens of thousands of verified reviews, Optimum Nutrition Serious Mass remains the best mass gainer overall. It delivers 1,200+ calories and 50 grams of blended protein per 2-scoop serving, has the longest track record with 34,000+ reviews, and works for the widest range of hard gainers. If you want a clean-bulking option, Optimum Nutrition Gold Standard Pro Gainer is the premium pick with the highest rating in our roundup.
For budget shoppers, Body Fortress Super Advanced delivers strong value with 1,000+ calories and 3 grams of creatine per serving. For lactose-intolerant lifters, MuscleMeds CARNIVOR Mass is the only formula built on beef protein isolate, and it is one of the best mass gainers for clean macros. Whatever your goal, the best mass gainers on this roundup have earned their place through thousands of verified reviews and real-world results.
Pick a formula that matches your calorie target, stick with it for at least 8 weeks, and pair it with consistent training and proper sleep. The best mass gainer in 2026 is the one you can drink daily and that fits your hard-gainer budget.