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 Supplements For Weight Gain | Lean Mass Gains & Your Daily

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The Optimum Nutrition Gold Standard Pro Gainer delivers 650 calories per serving with a 60g protein blend that combines whey isolate, concentrate, and egg protein for a complete amino acid profile. The carb matrix uses maltodextrin and oat flour to provide sustained energy without the insulin spike of straight sugar. With less than 8g of sugar per serving, this is a cleaner alternative to budget gainers that pack 40+ grams of sucrose per scoop.

The Vanilla Custard flavor mixes thick and creamy, coating your shaker without clumping. Each serving provides over 80g of carbohydrates to replenish glycogen stores post-training. Users report noticeable scale movement within the first week when taken consistently alongside resistance training, with many citing the manageable scoop size as a key advantage over bulkier gainers that require four to six scoops per serving.

One consideration is the serving size — while the tub appears generous, each container yields approximately 14 servings if you stick to the full 650-calorie dose. That makes it a premium option best suited for those who want a no-compromise mass gainer for serious bulking phases. The discontinued manufacturer tag on some listings does not affect the formulation, but availability can be spotty on occasion.

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MuscleMeds CARNIVOR Mass Gainer is the world’s first beef protein isolate mass gainer, packing 700 calories, 50 grams of protein, and 125 grams of carbohydrates per serving with zero fat and zero sugar. The beef protein isolate is hydrolyzed for rapid absorption and is 350% more concentrated in amino acids than steak, making it a potent tool for those who struggle with dairy digestion. The Chocolate Peanut Butter flavor masks any beefy undertones, delivering a taste that many compare to chocolate milk rather than a livestock byproduct.

The carb blend here is heavy on maltodextrin to drive rapid insulin response and glycogen replenishment. Users with fast metabolisms find the 125g carb load effective for packing on weight without the bloat typical of cheaper gainers. The powder mixes surprisingly thin for a mass gainer — you can fit three scoops in a standard shaker cup without it turning into pudding. Hardgainers report adding 3,000+ calories daily across multiple shakes to maintain a surplus during heavy training blocks.

Because this is a beef isolate, the texture can be slightly powdery and may require a blender for completely smooth consistency. A faint beef smell is noticeable in the powder itself, though it disappears once mixed with milk or a dairy-free alternative. The halal certification adds assurance for those with dietary restrictions, and the high calorie-to-serving ratio makes it one of the most efficient mass gainers on the market.

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While not a mass gainer in the traditional sense, Optimum Nutrition Gold Standard 100% Whey is the bedrock supplement for anyone looking to build lean mass. Each scoop delivers 24 grams of premium protein from a blend of whey isolate, concentrate, and peptides, with just 3 grams of carbs and 1 gram of sugar. It’s designed for the athlete who wants to add protein without the excess calories, making it ideal for stacking with carb powders or whole foods for a customized bulking approach.

The Double Rich Chocolate flavor is a benchmark in the industry — not overly sweet, no artificial aftertaste, and it mixes instantly with a spoon in water or milk. The 5.5 grams of naturally occurring BCAAs per serving support muscle protein synthesis and recovery after training. Users consistently praise the smooth texture and lack of digestive discomfort, even with multiple servings per day. Glanbia Performance Nutrition has been manufacturing this formula for decades, and the quality control is among the most reliable in the supplement space.

The main limitation for weight gain purposes is the low calorie count per serving. At roughly 120 calories per scoop, you’ll need to combine it with calorie-dense mixers or take multiple servings to generate a significant surplus. Some users note that certain flavor variants — particularly the Double Rich Chocolate — can have a slightly artificial sweetener aftertaste, though this varies by individual palate.

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Dymatize ISO100 is a hydrolyzed whey protein isolate that delivers 25 grams of protein per scoop with only 120 calories, 2 grams of carbs, and 1 gram of sugar. The Fruity Pebbles collaboration nails the nostalgic cereal flavor — it tastes exactly like the milk left in the bowl after eating Fruity Pebbles, without the chalky or artificial aftertaste that plagues many flavored proteins. The hydrolysis process breaks down the protein into smaller peptides for faster digestion and absorption, making this an excellent post-workout option for rapid amino acid delivery.

Users highlight the light texture and clean digestion as standout features. Unlike heavier protein concentrates that can cause bloating, ISO100 mixes thin and settles easily, even for those with moderate lactose sensitivity. The 5.5 grams of BCAAs per serving support muscle repair, and the low carb count makes it suitable for clients on cutting phases or those who want to add protein without breaking their carb budget. The powder mixes completely with just a few shakes and leaves no residue in the shaker.

The Fruity Pebbles flavor is notably sweet — some users find it too intense for daily consumption and prefer it for occasional use or as a baking ingredient. The 20-serving tub is relatively small, so frequent users will burn through it quickly. At a mid-range price point per serving, it’s a premium isolate that justifies its cost through taste and digestibility, but it doesn’t serve as a standalone weight gain solution due to the low calorie content.

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BOOST MAX Protein Shakes deliver 30 grams of high-quality protein in a ready-to-drink format, with only 1 gram of sugar and 160 calories per 11-ounce bottle. The Vanilla flavor is smooth and avoids the chalky, chemically taste that plagues many RTD shakes — users consistently rate it as one of the best-tasting options in the category. Beyond the protein, each bottle is fortified with 26 vitamins and minerals, including zinc, vitamin C, and iron for immune support, plus B12 and niacin for brain health and energy metabolism.

This is not a mass gainer but a convenient protein supplement for people who struggle to prepare shakes or need a portable option for travel, work, or post-gym recovery. The 3-in-1 formula — supporting muscle, energy, and bone health — makes it a complete nutritional solution rather than just a protein delivery system. The gluten-free and kosher certifications broaden its appeal, and the B Corp certification indicates a commitment to ethical manufacturing practices.

The main drawbacks for weight gain purposes are the low calorie count and the cost per serving compared to powder alternatives. At 160 calories per bottle, you’d need to drink multiple bottles daily to generate a meaningful surplus, which quickly becomes expensive. The 18-pack offers a reasonable per-unit cost, but it still sits in a premium tier for a product that primarily serves as a supplement rather than a calorie-dense gainer.

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NOW Foods Carbo Gain Powder is pure maltodextrin sourced from non-GMO corn, offering a clean, tasteless carbohydrate source for athletes looking to add calories without additional protein or fat. The 12-pound bag provides massive value — each scoop delivers approximately 100 calories with zero sugar, zero protein, and zero fat, making it a blank slate for customizing your caloric intake. Maltodextrin is a complex carb made of glucose polymers that digest rapidly, ideal for pre-workout fueling or post-workout glycogen replenishment.

Users who neglect carbs often report a noticeable drop in training energy, and this powder solves that problem without the bloat associated with whole-food carb loading. It mixes clear and flavorless in water, juice, or protein shakes, allowing you to bump the calorie content of any drink without altering the taste. Bodybuilders and hardgainers use it to add 400-800 calories to their daily intake with minimal volume — a single 60g serving provides 60 grams of carbs that dissolve instantly in a shaker cup.

The powder is extremely dusty and sticky — it behaves like powdered sugar and can create a mess if you’re not careful. The fine particles tend to fly into the air when scooping, and the bag’s resealable closure is not airtight, so transferring to a dedicated container is recommended. Some users also report that pure maltodextrin can cause digestive discomfort if consumed in large amounts without adequate water intake.

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NutraBio CarboMax is a maltodextrin-only carb powder designed for sustained energy without the drawbacks of simple sugars. The unflavored formula blends seamlessly into water, shakes, or meals, allowing you to increase your calorie and carb intake without changing the taste profile. Each 5-pound tub yields 75 servings, with each serving providing a dense carb load that supports muscle endurance and mass gain without the insulin spike of sucrose-based products.

Users consistently praise the smooth mixability — CarboMax dissolves faster and with fewer clumps than some competing maltodextrin products. The time-released energy profile keeps blood glucose stable during long training sessions, preventing the crash that comes from sugary pre-workout formulas. Those with busy schedules find it efficient to mix a serving into their morning shake or post-workout drink to hit their carb targets without preparing whole-food meals.

The main limitation is the same across all maltodextrin powders — high doses can cause gastrointestinal upset for some users. The 5-pound size is smaller than the NOW Foods 12-pound bag, which means less value per pound if you’re using it as a primary calorie source. NutraBio’s manufacturing is backed by third-party testing, but the price per serving is slightly higher than the NOW alternative, making it a mid-range choice within the pure-carb category.