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 Protein Supplement For Weight Gain | Eat Big, Grow Big

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The GNC AMP Mass XXX sets the standard for a science-backed mass gainer. It delivers 50g of protein per serving alongside 780 calories from a well-structured macronutrient profile that includes MyoTOR and BETAPOWER — both clinically studied for strength and endurance improvements. Users report measurable gains in as little as two weeks, which is rare for a product in this category.

What separates this from standard mass gainers is the MyoTOR complex. It’s designed to improve muscle performance with fewer working sets, meaning you can trigger growth without grinding through endless volume. The formula also includes micronized amino acids and creatine, but everything is dosed with purpose, not stuffed in for the label.

On the practical side, this gainer mixes reasonably well in a shaker with no clumping issues, and the vanilla flavor is palatable without being overly sweet. The tub provides 13 servings, so it’s not the cheapest per-shake option, but for lifters who want clinically supported gains and a clean ingredient profile, the investment makes sense.

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Optimum Nutrition’s Gold Standard Pro Gainer hits a sweet spot for lifters who want a weight gainer that doesn’t sacrifice protein quality for calorie counts. With 60g of protein per serving and 650 calories, it’s a relatively moderate calorie load compared to some 1200-calorie behemoths, but the protein blend includes whey isolate and concentrate — ensuring that every gram of protein has high bioavailability for muscle repair.

The carbohydrate content sits at just over 80g, with under 8g of sugar per serving. This makes it a better choice for those who want to control blood sugar spikes while still being in a caloric surplus. The Vanilla Custard flavor has earned strong praise for being rich without an artificial medicine-like taste, and the powder mixes easily in a shaker with no grittiness.

Customer reviews back the real-world effectiveness — several users report gaining roughly 5 pounds within the first week of consistent use. Keep in mind that each tub provides 14 servings with the recommended 3-scoop dose, so it works best as a post-workout or meal replacement shake rather than a between-meal snack.

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The Dymatize Super Mass Gainer is built for one thing: delivering an extreme caloric surplus in a single shake. Each serving packs 1290 calories, 248g of carbohydrates, and 52g of protein from a blend of fast- and slow-digesting sources. This is the go-to for hard gainers who struggle to eat enough solid food and need a dense caloric payload without spending an hour chewing.

One of the standout features here is the inclusion of 10.7g of BCAAs per serving, with 5.1g of leucine specifically — the primary amino acid trigger for muscle protein synthesis. The Fruity Pebbles flavor has become a cult favorite; drinkers describe it as tasting exactly like the leftover milk from a bowl of the cereal, which makes those high-volume shakes much more tolerable.

On the digestion front, shaking with cold water produces a thinner consistency that’s easier to sip throughout the day. Users with fast metabolisms have reported consistent weight gain after adding just one shake daily alongside their regular meals. With 8 servings per 6-pound tub, it’s a competitive option for those prioritizing raw calorie density.

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If whey protein leaves you bloated or breaking out, the MuscleMeds CARNIVOR Mass Gainer offers a genuine alternative: beef protein isolate. This is the world’s first and best-selling beef protein mass gainer, delivering 50g of protein per serving with zero fat, zero sugar, and zero lactose. The protein is 350% more concentrated in amino acids than steak, without any gelatin or collagen fillers.

Each serving provides 700+ calories and 125g of carbohydrates, with a texture that mixes thinner than standard whey-based gainers. Users find they can fit 3 scoops into a standard shaker cup without the sludge-like thickness seen in other brands. The Chocolate Peanut Butter flavor is a favorite, with a faint beef aroma that quickly gets masked by the chocolate and nut profile.

Beyond the macros, the formula is designed to spike blood amino acids and glucose rapidly, stimulating protein and glycogen synthesis for faster muscle gain. Since it’s lactose-free and Halal-certified, this is a strong pick for anyone with dairy sensitivities who wants to maintain a serious calorie surplus without digestive distress.

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The Ronnie Coleman King Mass XL lives up to its name by delivering a king-sized 60g of protein and over 1000 calories per serving. It’s designed for serious lifters who refuse to settle for slow progress. Each serving also includes 180g of carbohydrates, plus added creatine and glutamine to support both recovery and explosive strength output in the gym.

The chocolate flavor is widely described as milkshake-like, which helps when you’re forcing down a heavy shake post-training. Mixability is a strong point — even with the recommended 4 scoops, the powder dissolves cleanly without paste-like clumps. Some users report dramatic gains in as little as two weeks, with one reviewer adding 11 pounds of solid mass in that short period.

Each 6-pound bag contains 108 scoops according to the manufacturer, delivering excellent volume per purchase. However, some individuals found it less effective for their specific metabolism, reporting no weight gain after a month of use. Results can vary, especially if your maintenance calories are already high, but for the hard gainer who trains heavy, the macros here are formidable.

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The Optimum Nutrition Gold Standard 100% Whey is a foundational protein powder that works as a core building block in any weight gain strategy. It delivers 24g of high-quality whey protein per scoop, with 5.5g of naturally-occurring BCAAs and 11g of EAAs. While it’s not a mass gainer on its own, it’s the cleanest way to add concentrated protein to your diet without excess carbs or filler.

What makes this relevant for weight gain is its versatility. You can use multiple scoops throughout the day — a shake between meals, one post-workout, and even one before bed — to stack protein intake without overwhelming your digestive system with heavy carb loads. The Double Rich Chocolate flavor mixes instantly, with no clumps or grit, even when shaken with cold water.

Because it’s primarily whey protein isolate, the fat and carbohydrate content is minimal. This is ideal for users who want to maintain a lean mass phase where they control calories precisely. For pure weight gainers who need a cheap, reliable protein base to add to oats, peanut butter, and milk in homemade shakes, this remains the gold standard for a reason.

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The Animal M-Stak takes a completely different approach to weight gain — it’s not a powdered shake but a tablet-based supplement that uses nutrient partitioning to help your body direct calories toward muscle tissue instead of fat storage. This makes it a strong companion for those who already have a solid diet plan but struggle to see the muscle yield from the calories they consume.

Each pack contains 6 different complexes designed to boost energy, reduce cortisol, prevent muscle breakdown, and induce an anabolic environment. Hard gainers specifically find value here — the formula is targeted at individuals who eat enough calories but can’t keep weight on. Users report noticeable changes in muscle fullness, strength, and body fat reduction when using M-Stak alongside training.

It’s important to note that this is a 21-day cycle supplement, not an everyday infinite stack. The packets are convenient for travel, but the pills are numerous and large, so you’ll need to drink plenty of water to wash them down. It’s non-hormonal, which removes the risk associated with prohormones while still offering significant anabolic support for those who’ve hit a plateau.