For anyone struggling with a low appetite, a hyper-fast metabolism, or a medical condition that makes eating difficult, hitting a caloric surplus with solid food alone can feel like a full-time job. Liquid calories offer a practical workaround — delivering dense nutrition without the jaw fatigue or stomach discomfort that comes from forcing down another plate of rice and chicken. The challenge is sorting the sugar-laden junk from the shakes that actually provide usable macronutrients, vitamins, and minerals for healthy weight gain.
I’m Mohammad — the founder and writer behind ProteinJug. I’ve analyzed hundreds of nutritional shake labels, protein blends, and mass gainer formulations to separate smart supplement strategies from marketing hype, focusing specifically on what actually moves the scale for hardgainers and underweight individuals.
Whether you are recovering from illness, training to add muscle mass, or dealing with a naturally stubborn metabolism, this guide breaks down the top contenders for the best drinks to gain weight with an emphasis on real-world calorie density, ingredient quality, and digestibility.
How To Choose The Best Drinks To Gain Weight
The market is flooded with “weight gain” shakes that are essentially fortified sugar water. To choose a drink that actually supports healthy weight gain, you need to focus on three core pillars: total calorie density, protein-to-carbohydrate ratio, and the absence of low-value fillers. A good shake should provide concentrated nutrition — not just empty calories.
Prioritize Calorie Density Over Volume
The biggest mistake buyers make is choosing a shake with a low calorie count per fluid ounce. If you already struggle to eat, drinking a 250-calorie shake in 12 ounces is counterproductive — you’ll feel full without making progress. Look for drinks that pack at least 400 calories into an 8-to-11-ounce serving. This allows you to consume meaningful calories in a small liquid volume, which is the entire premise of liquid nutrition for weight gain.
Check the Protein Source and Digestibility
Whey concentrate is the most common protein source in mass gainers, but it can cause bloating in lactose-sensitive individuals. Beef protein isolate, plant proteins like pea or rice, and milk protein isolate are excellent alternatives. For ready-to-drink shakes, look for options that use natural flavors and avoid artificial sweeteners, which can upset the digestive system and reduce meal frequency compliance.
Watch the Sugar: Fructose vs. Complex Carbs
Many mass gainers use maltodextrin and dextrose as cheap carbohydrate sources that spike blood sugar without providing sustained energy. A better formula uses oat flour, sweet potato powder, or a carbohydrate blend that includes fiber. Also, avoid drinks that list high-fructose corn syrup or excessive added sugars (over 15g per serving) as those calories come with an inflammatory cost.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Boost VHC (12-pack) | Ready-to-Drink | Low appetite, medical weight gain | 530 cal / 8 fl oz | Amazon |
| Optimum Nutrition Gold Standard Pro Gainer | Powder Mass Gainer | Muscle gain, post-workout bulk | 650 cal / serving, 60g protein | Amazon |
| Kate Farms Organic 1.4 | Organic RTD Shake | Sensitive stomachs, clean ingredients | 455 cal / 11 fl oz, USDA Organic | Amazon |
| MuscleMeds CARNIVOR Mass Gainer | Powder Mass Gainer | Dairy-free, high-calorie bulk | 700+ cal, 50g beef protein isolate | Amazon |
| Boost VHC Variety (24-pack) | RTD Variety Pack | Long-term supply, flavor rotation | 530 cal / 8 fl oz, 3 flavors | Amazon |
| Nutricost Mass Gainer | Budget Powder | High protein, cost-conscious bulk | 50g protein per serving | Amazon |
| Optimum Nutrition Gold Standard Whey | Protein Isolate | Lean muscle support, low fat intake | 24g whey protein isolate per scoop | Amazon |
In‑Depth Reviews
1. Boost Very High Calorie (12-pack)
Boost Very High Calorie delivers 530 calories in just 8 fluid ounces — one of the most calorie-dense ready-to-drink formulas available on the market. With 22 grams of protein and 26 vitamins and minerals per bottle, this shake functions as a convenient mini-meal for anyone struggling with appetite. The chocolate flavor uses natural flavors with no artificial sweeteners, colors, or preservatives, making it a clean choice for sensitive systems.
The viscosity is notably thicker than standard Boost or Ensure drinks, which is a direct result of the high calorie concentration. Users with swallowing difficulties or severe appetite loss often prefer chilling it over ice or sipping it slowly to manage the texture. The 12-bottle pack is perfect for a trial run before committing to larger bulk purchases, and the compact 8-ounce volume means you can finish one without feeling overly full.
Customer feedback consistently highlights its effectiveness in preventing weight loss during illness, post-surgery recovery, and cancer treatment. The blend includes vitamins C, zinc, and iron for immune support, plus B vitamins and calcium for energy metabolism and bone health. It is a reliable, nutritionally complete option that sits comfortably at the top of the list for straightforward, effective weight gain.
Why it’s great
- Highest calorie density per ounce in any mainstream RTD shake
- Natural flavors with no artificial ingredients or sweeteners
- Fortified with 26 vitamins and minerals for complete nutrition
Good to know
- Thick texture may not suit everyone — chill or dilute if needed
- Only one flavor per pack; variety pack sold separately
2. Optimum Nutrition Gold Standard Pro Gainer
Optimum Nutrition’s Gold Standard Pro Gainer is a purpose-built mass gainer powder that provides 650 calories and 60 grams of protein per serving, supported by over 80 grams of carbohydrates and less than 8 grams of sugar. This formula strikes a deliberate balance — high enough in total carbs to fuel recovery and muscle glycogen replenishment, but low enough in sugar to avoid the insulin spikes associated with cheap maltodextrin blends. The Vanilla Custard flavor is notably creamy and mixes well in water or milk without clumping.
The protein blend combines whey protein isolate, concentrate, and milk protein isolate, delivering a full amino acid profile including naturally occurring BCAAs and EAAs for muscle protein synthesis. With only 14 servings per container, the calorie commitment is high per scoop, so it is best suited for individuals who have already established a baseline meal plan and need a dense top-up to push past a plateau. The low sugar content (under 8g) means it can also serve as a post-workout recovery shake without spiking blood glucose.
Users report noticeable weight gains within the first week — some citing 5-pound increases when combining two shakes daily with resistance training. The mixability is excellent, requiring only a few seconds of shaking to dissolve fully. Despite being marketed as a mass gainer, the protein quality and low sugar profile make it a smarter choice for those looking to add lean mass rather than fat.
Why it’s great
- 60g high-quality protein blend for superior muscle-building support
- Less than 8g of sugar despite 80g+ total carbs
- Excellent mixability with no gritty texture
Good to know
- Only 14 servings per container — relatively low for the total weight
- Vanilla Custard flavor is rich; may not appeal to those preferring lighter shakes
3. Kate Farms Organic 1.4 High Calorie (12-pack)
Kate Farms Organic 1.4 stands apart from the mass-gainer crowd by offering a plant-based, USDA Organic formula that is free from common allergens — no dairy, soy, gluten, or artificial anything. Each 11-ounce bottle provides 455 calories and 20 grams of plant protein derived from peas and rice, delivering a complete amino acid profile without the digestive irritation that whey can cause in sensitive individuals. The inclusion of 27 vitamins and minerals plus phytonutrients from organic broccoli, green tea, turmeric, and acai elevates this beyond a simple calorie source into a functional nutrition shake.
The texture is smooth and notably lighter than dairy-based shakes, with the vanilla flavor blending well into fruit smoothies or coffee. Many users with digestive conditions like acid reflux, IBS, or post-surgical sensitivity report that Kate Farms is one of the few shakes they can tolerate daily without bloating or discomfort. The company’s commitment to plant-based ingredients also means no cholesterol and lower saturated fat, which may matter for those with cardiovascular concerns.
Clinical reviews from families caring for elderly relatives and patients with malnutrition describe Kate Farms as a “lifesaver” for its digestibility and clean ingredient panel. The only trade-off is the price point, which is higher per bottle than conventional mass gainers. But for individuals who need a hypoallergenic, organic, high-calorie option, this shake is uniquely positioned as the premium gastrointestinal-friendly choice.
Why it’s great
- USDA Organic, Non-GMO, and free from all major allergens
- Plant-based protein that digests easily without bloating
- Includes phytonutrients for added antioxidant support
Good to know
- Higher cost per calorie compared to standard mass gainers
- Vanilla flavor benefits from blending with fruit or nut butter
4. MuscleMeds CARNIVOR Mass Gainer
MuscleMeds CARNIVOR Mass Gainer distinguishes itself by using beef protein isolate as the sole protein source — an animal protein that is 350% more concentrated in amino acids than steak and completely lactose-free. Each serving delivers over 700 calories, 50 grams of beef protein isolate, 125 grams of carbohydrates, and zero fat or sugar, making it one of the leanest high-calorie mass gainers available. The Halal certification and absence of gelatin or collagen further underscore its premium sourcing standards.
The Chocolate Peanut Butter flavor masks any beefy aftertaste effectively, though some users report a faint savory note beneath the sweetness. The powder is fine and tends to get sticky if not mixed immediately; a blender is recommended for the smoothest consistency, especially when using four scoops to hit the full serving. The carbohydrate matrix is primarily maltodextrin-based, which provides rapid glycemic response — ideal immediately post-workout but worth monitoring for those sensitive to blood sugar fluctuations.
Bodybuilders and hardgainers with dairy intolerance often cite CARNIVOR as the only mass gainer that doesn’t cause gastrointestinal distress or bloating. The 6-pound tub provides 8 full servings, making it relatively high-cost per shake but justified by the unique protein source and zero-sugar carbohydrate profile. It excels in the niche of dairy-free, high-calorie mass gainers for serious lifters.
Why it’s great
- 100% lactose-free beef protein isolate — no dairy at all
- Zero sugar and zero fat despite high calorie count
- Halal certified with no collagen or gelatin fillers
Good to know
- Powder can clump — a blender gives the best texture
- Maltodextrin-heavy carbohydrate blend may spike blood sugar
5. Boost Very High Calorie Variety (24-pack)
This 24-pack variety case of Boost Very High Calorie solves the flavor fatigue problem that plagues single-flavor shake regimens. It includes Vanilla, Chocolate, and Strawberry in equal proportion — each bottle packing 530 calories, 22 grams of protein, and 26 essential vitamins and minerals. The slight flavor differences help with daily compliance, especially for individuals who have to drink these shakes multiple times a day to maintain weight.
The nutritional profile is identical across all three flavors: 8 fluid ounces, 530 calories, 22g protein, 26 vitamins and minerals, and no artificial flavors or sweeteners. The Strawberry flavor is often described as reminiscent of strawberry milk, while the Vanilla has a melted-ice-cream quality that makes it easy to consume straight from the bottle. As with the single-flavor packs, the texture is thicker than standard nutritional shakes, and drinking slowly or over ice is recommended to avoid nausea.
Caregivers and patients alike appreciate the variety pack for long-term feeding plans where taste monotony can lead to skipped doses. The price per bottle is slightly higher than buying a single-flavor 12-pack, but the convenience and compliance boost justify the premium for those who need sustained adherence. This is a strong choice for families managing weight gain for a member over months rather than weeks.
Why it’s great
- Three different flavors reduce taste fatigue over time
- Same excellent 530-calorie, 22g protein profile in every bottle
- No artificial sweeteners or colors in any flavor
Good to know
- Higher per-bottle cost than single-flavor 12-pack
- Thick consistency may require chilling for some users
6. Nutricost Mass Gainer (Double Chocolate, 7 lbs)
Nutricost Mass Gainer offers a straightforward, no-frills approach to mass gain with 50 grams of protein per serving from whey protein concentrate, plus added creatine monohydrate and L-glutamine for muscle recovery and performance. At 7 pounds per tub with 9 servings, the total volume provides solid value for those looking to consistently stack calories without breaking the bank. The Double Chocolate flavor is designed to be palatable without being cloyingly sweet, mixing smoothly with water, milk, or peanut butter.
The inclusion of creatine monohydrate is a notable bonus — most mass gainers omit it, leaving lifters to buy it separately. Each serving delivers approximately 3-5 grams of creatine, enough to support ATP regeneration during resistance training. The L-glutamine adds additional recovery support, though the effective dose is moderate. The main protein source is whey concentrate, which means lactose-sensitive individuals may experience digestive issues, so it works best for those with no dairy sensitivity.
Parents of teen athletes and college lifters consistently highlight the clean ingredient profile and the safe level of processing — manufactured in an NSF-certified, GMP-compliant facility. The taste is described as smooth with no chalky aftertaste, and the mixing instructions (shaker bottle recommended) produce a consistent texture. For the price per gram of protein and creatine combined, it is one of the best budget options for gaining mass.
Why it’s great
- Includes creatine monohydrate and L-glutamine in the formula
- Excellent cost per serving for the nutrient density
- Non-GMO, gluten-free, and independently lab-tested
Good to know
- Whey concentrate can cause bloating in lactose-sensitive users
- Only 9 servings per 7-pound tub despite the large container
7. Optimum Nutrition Gold Standard 100% Whey
While not a dedicated weight gain shake, Optimum Nutrition Gold Standard 100% Whey is an essential building block for anyone serious about gaining lean mass. Each scoop delivers 24 grams of high-quality whey protein (primarily isolate) with minimal carbs and fat — roughly 120 calories per scoop. The Double Rich Chocolate flavor is widely regarded as the gold standard for taste, dissolving effortlessly into milk or water without clumping or gritting. Used as a base, you can turn this into a high-calorie shake by adding oats, peanut butter, banana, and whole milk.
The 1.98-pound tub contains approximately 29-30 servings, making it a more budget-friendly option per gram of protein than dedicated weight gainers. Since the protein is primarily isolate, it digests quickly and has a very low lactose content, reducing the risk of bloating. This makes it ideal for post-workout windows when rapid amino acid delivery matters most. The low sugar and carb profile also means you control exactly how many extra calories you add rather than being locked into a mass gainer’s fixed carbohydrate load.
Lifters and athletes who prefer a modular approach to weight gain — adjusting calories by the tablespoon of added ingredients — gravitate toward this product as a reliable year-round protein supplement. The reputation for consistent quality across batches, easy mixability with both liquid and solid additions, and clean amino acid profile make it a smart foundational choice. If you prefer to build your own weight gain shake from scratch, this is the protein base to start with.
Why it’s great
- Whey protein isolate as primary ingredient — low lactose, fast absorption
- Versatile base for DIY high-calorie shakes with whole foods
- Industry-standard taste and mixability, batch after batch
Good to know
- Only 120 calories per scoop — not a standalone weight gain drink
- Must be mixed with calorie-dense additions for a proper bulking shake
FAQ
How many of these shakes should I drink per day for weight gain?
Will these shakes make me gain fat instead of muscle?
Final Thoughts: The Verdict
For most users, the best drinks to gain weight winner is the Boost Very High Calorie (12-pack) because it combines the highest calorie-per-ounce density with a clean, naturally flavored formula and complete vitamin and mineral support, making it ideal for low-appetite and medical recovery situations. If you want a dairy-free, high-calorie mass gainer designed for serious lifters, grab the MuscleMeds CARNIVOR Mass Gainer. And for a modular, DIY approach to building your own calorie-dense shakes with total control over ingredients, nothing beats the Optimum Nutrition Gold Standard 100% Whey as the protein foundation.