Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.7 Best Muscle Gainer Supplement | 750+ Calorie Clean Mass Stack

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Ronnie Coleman’s King Mass XL is the heaviest hitter on this list in terms of raw caloric and protein density. Each full serving delivers over 1,000 calories, 60g of protein, and 180g of carbohydrates — numbers that make it a serious tool for hardgainers who struggle to eat enough whole food. The protein blend includes whey concentrate and milk protein isolate, and it’s fortified with creatine monohydrate and L-glutamine, two ingredients with solid evidence for strength and recovery support.

User reviews consistently report rapid scale movement — several users gained over ten pounds in two weeks — alongside a taste that’s frequently compared to a chocolate milkshake rather than a chalky supplement. The mixability is good for a four-scoop serving, though you’ll want a blender or a large shaker bottle. The carb source leans on maltodextrin rather than whole-food starches, which is the primary trade-off for that extreme calorie count.

For lifters who want maximal calories with minimal volume and don’t mind a simpler carb profile, this is the most bang for your buck in the mass gainer category. The 108 scoops per bag also make it one of the longest-lasting options available.

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The Optimum Nutrition Pro Gainer takes a more measured approach than the extreme bulkers. Each serving provides 650 calories, 60g of a multi-source protein blend (whey, casein, and egg), and 80g of carbohydrates with under 8g of sugar. This is a cleaner macro split that supports muscle growth without the insulin spike and fat gain risk associated with higher-sugar formulas.

ON’s reputation for mixability holds true here — the powder blends smoothly with water and leaves no gritty residue. The Vanilla Custard flavor is particularly popular, with reviewers calling it creamy and enjoyable enough to drink daily without palate fatigue. The lower carb count (80g vs 180g in the Ronnie product) makes it a better fit for users who are active but not engaging in extreme volume training, or for those who want to add mass more gradually.

One downside is the serving size yields only 14 servings per tub, so the cost per shake is higher than bulk alternatives. But for anyone seeking a premium, well-rounded mass gainer that prioritizes protein quality and digestibility over raw calorie extremes, this is a top-tier choice.

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GNC’s AMP Mass XXX is a clinically positioned mass gainer that leans on patented ingredients rather than just high calorie counts. The standout addition is MyoTOR, a compound that GNC claims is clinically shown to accelerate strength gains in as little as two weeks. Each serving also includes creatine monohydrate, beta-alanine (from BETAPOWER), and 50g of protein to support both muscle size and performance output.

The total per serving lands around 780 calories, putting it in the mid-to-high range for caloric density among the premium options. The Vanilla flavor has a clean, neutral taste that blends easily with milk or oats, and the powder mixes with minimal clumping. Users consistently note that the product does not cause the heavy bloating typical of many high-calorie gainers.

The primary consideration here is the price point — it’s one of the more expensive options per serving on this list. However, for the lifter who wants a science-backed formula with evidence-based performance boosters built in, and who values strength improvements alongside mass gains, the AMP Mass XXX delivers a complete package that few competitors match.

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The Chocolate Peanut Butter CARNIVOR Mass from MuscleMeds is a unique entry because it uses 100% beef protein isolate as its protein source — no whey, no dairy, no lactose. This makes it the go-to option for individuals with dairy sensitivities who still want a high-protein mass gainer. Each serving clocks 50g of protein, 125g of carbs, and over 700 calories, with zero fat and zero sugar.

Reviewers frequently highlight how well it mixes for a beef-based powder — it’s not gritty and doesn’t have the chalky texture some alternative proteins do. The Chocolate Peanut Butter flavor masks any beefy undertones effectively, though a faint smell is noted by some. The carb sources are simple, so it’s effective for rapid glycogen replenishment post-workout.

The zero-fat and zero-sugar claim is impressive on paper, but it means the formula lacks any slow-digesting component — it’s a fast-acting anabolic hit rather than a sustained-release meal replacement. For lactose-intolerant lifters who struggle with standard mass gainers, this product fills a critical gap in the market.

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The Optimum Nutrition Gold Standard 100% Whey is not a mass gainer in the traditional sense — it’s a standalone protein powder. But it earns a spot in this guide because many experienced lifters prefer to build their own mass gainer by mixing 24g of this whey with oats, peanut butter, milk, and creatine. This DIY approach lets you control the carb source and calorie density while keeping the protein base top-tier.

The Double Rich Chocolate flavor has been a staple for nearly two decades, with users consistently praising its smooth mixability and balanced sweetness. At roughly 120 calories and 24g of protein per scoop, it’s a low-calorie protein tool that complements a bulking diet rather than dominating it. The whey isolate primary ingredient means fast absorption with minimal lactose, which helps with digestive comfort.

The limitation is obvious: you won’t get the full mass gainer experience from one scoop. But for the lifter who values ingredient control and already eats enough whole food carbs, buying ON Gold Standard and customizing your own shake is often a smarter, more flexible long-term strategy than committing to a fixed-ratio mass gainer tub.

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Nutricost has carved out a reputation for offering straightforward, no-nonsense supplements at accessible prices, and their Mass Gainer follows that blueprint. Each serving delivers 50g of protein from whey concentrate, along with added creatine monohydrate and L-glutamine, all packed into a 7-pound container that offers strong value for the price. The Double Chocolate flavor is sweet — some users say very sweet — but it mixes cleanly without the chalky sediment common in cheaper powders.

The protein-per-scoop ratio is one of the best in the budget tier, and the inclusion of creatine saves you from having to buy a separate supplement. The carb source is simple but effective for post-workout glycogen replenishment. Several users noted occasional stomach discomfort with larger servings, suggesting the formula may benefit from added digestive enzymes.

For the athlete on a budget who wants a straightforward mass-building tool with added performance ingredients, the Nutricost Mass Gainer delivers exactly what it promises. It’s not the most refined formula in terms of digestive aids or premium carb sources, but the value proposition is hard to beat.

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The Strawberry version of MuscleMeds CARNIVOR Mass is the same beef protein isolate formula as its chocolate counterpart, but the flavor profile is less forgiving. Users consistently report that the strawberry taste is mild at best and artificial at worst, with several resorting to mixing it with chocolate protein powder to make it palatable. That said, for the dairy-free lifter who specifically needs the strawberry variant, the core formula remains excellent.

The macros mirror the chocolate version: 50g of protein from 100% beef isolate, zero lactose, zero dairy, and a carbohydrate blend that supports fast energy replenishment. The powder is fine and can clump if not blended properly, but a few seconds in a blender yields a smooth shake. The primary benefit is the same — it’s one of the few mass gainers that won’t trigger lactose intolerance symptoms.

If you don’t have dairy issues, the chocolate version is the better choice due to superior taste. But if you are set on the strawberry flavor for variety or have specific dietary preferences, this product works effectively as a mass builder once you find the right mixing method.