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If you struggle to eat enough each day, the fix is often a drink that pours calories in fast. That is the whole point of a weight gain protein shake — it gives you a serious calorie hit without a plate of food. The seven options below cover the whole range, from ready-to-drink bottles you can sip on the go to mass-gainer powders that deliver over 1,200 calories per serving. Each one suits a different person, and the guide below tells you exactly who each one fits.
This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
You will see how much protein and how many calories each option delivers per serving, plus how thick the drink gets and who will find it easiest to swallow. By the end, you will know which weight gain protein shake fits your appetite and your routine best.
Top Picks
How To Choose The Best Weight Gain Protein Shake
The first thing to get straight is that this category splits into two very different products. Ready-to-drink bottles are already mixed and need no effort — you open one and drink it. Powder mass gainers are cheaper per serving and hit far higher calorie numbers, but you have to measure, mix, and clean up after. Neither is better; they solve different problems.
Start with calories per serving, not per bottle
A shake only helps you gain weight if you can finish it comfortably and repeat it daily. One option here packs 530 calories into an 8 fl oz bottle, which is dense but manageable for people with a small appetite. A powder gainer can push past 1,200 calories per two-scoop serving, but that same serving is often thick enough that you need to split it across the day.
Check the protein number against your daily goal
Protein per serving varies widely across this list. The ready-to-drink shakes sit around 22 to 30 grams, while the powders go up to 60 grams per serving. If you are using the shake as your main protein source, weight the higher-protein powders more heavily. If it is a top-up between meals, a mid-range number is plenty.
Think about texture before you buy a big tub
Calorie-dense drinks are thicker than a normal shake, and texture is the single most common reason people stop using one. Many of these products advise chilling over ice or sipping slowly to thin the drink out. If you know you dislike thick liquids, start with a smaller pack or a flavor you can mix with milk and ice.
Side-by-Side Comparison
| Model | Best For | Calories Per Serving | Protein Per Serving | Format | Amazon |
|---|---|---|---|---|---|
| BOOST Very High Calorie Chocolate 8 fl oz (12 pack)★ Best Overall | Low appetite, easy sipping | 530 | 22 g | Ready-to-drink | Amazon |
| Jocko Fuel High Protein Shakes Vanilla 12 fl oz (12 pack)Cleanest Sip | Clean ingredients, meal swap | 180 | 30 g | Ready-to-drink | Amazon |
| MuscleMeds CARNIVOR Mass Gainer Chocolate Peanut Butter 6 lb | Lactose-free mass building | 700+ | 50 g | Powder | Amazon |
| Optimum Nutrition Serious Mass Chocolate 6 lb | Serious bulking on a budget | 1,200+ (2 scoops) | 50 g | Powder | Amazon |
| BOOST Very High Calorie Variety Pack 8 fl oz (24 pack) | Flavor choice, bigger supply | 530 | 22 g | Ready-to-drink | Amazon |
| Ronnie Coleman King Mass XL Dark Chocolate 15 lb | High-volume bulk buyers | 1,000+ | 60 g | Powder | Amazon |
| Optimum Nutrition Gold Standard Pro Gainer Vanilla Custard 5 lb | Protein-forward bulking | 650 | 60 g | Powder | Amazon |
Detailed Reviews
1. Boost Very High Calorie Chocolate 8 FL OZ
Our pick — 4.5+★ from 3,000+ verified ratings; the strongest balance of quality and price.
A 530-calorie hit in a bottle so small you can finish it before you feel full.
The reason to reach for this one first is simple: it fits a huge amount of fuel into a tiny bottle. Each 8 fl oz serving carries 530 calories, 22 grams of protein and 26 vitamins and minerals. If you cannot face a plate of food, that is a full mini-meal you can drink in minutes. Compare that to a typical ready-to-drink shake on this list — the Jocko Fuel bottle holds 180 calories across a larger 12 fl oz pour, so the Boost is doing far more work per mouthful.
The chocolate flavor is what wins people over. Owning a low appetite or a housebound relative, this is the shake that actually gets finished, and owners commonly mention it as a way to hold weight steady rather than lose it. One thing buyers report straight from the listing: “BOOST Very High Calorie (VHC) is the highest calorie BOOST drink providing 530 nutrient-rich calories, 22 grams of protein and 26 vitamins and minerals per 8 fl oz serving.” The bottle format means no scooping, no shaker, and no cleanup — you just chill it and drink.
The catch is texture. Because the calories are packed so tightly, the drink comes out thicker than a normal shake, and the maker says to sip it slowly and pour it over ice if you want it thinner. A few people find that thickness hard going, and one important note for anyone watching sugar: this is the Very High Calorie version, not the lower-sugar Glucose Control line, even though some reviews here talk about the sugar-free version. If you need the reduced-sugar formula, this is not the bottle for you.
Why This One Leads
- 530 calories and 22 g of protein in just 8 fl oz, so a small appetite can still hit a real calorie target.
- 26 vitamins and minerals per bottle, including vitamin C, zinc and iron.
- No mixing, no shaker, no mess — ideal for elderly relatives or anyone who cannot manage a powder.
- Chocolate is the flavor that keeps getting repurchased again and again.
What To Know First
- Dense by design, so the texture is thick — serve it over ice and sip it slowly.
- This is the full-sugar Very High Calorie line, not the lower-calorie, no-sugar BOOST option.
- It works best as a snack or mini-meal alongside real food, not as a total meal replacement.
Go for it when: appetite is the enemy — a small, calorie-packed bottle is the easiest surplus you will ever drink.
Look elsewhere when: you need the reduced-sugar BOOST formula or genuinely cannot handle a thick shake.
2. Jocko Fuel High Protein Shakes, Vanilla 12 fl oz (12 Pack)
A short ingredient list and a creamy vanilla pour that you can drink for lunch.
If your goal is protein rather than raw calories, this bottle flips the usual shake formula on its head. You get 30 grams of grass-fed protein and 180 calories per 12 fl oz serving, with no added sugar and no artificial sweeteners or colors. The blend of milk protein concentrate and calcium caseinate digests slowly, so the maker says it feeds muscle for hours. It is the ready-to-drink pick for someone who wants their shake clean rather than enormous.
What keeps people coming back is the taste and the texture together. Owners describe it as light and natural, not sweet and not chalky, and plenty finish a bottle in place of lunch. As owners put it about the daily habit: “Been drinking for lunch for over 6 months. Love it. Light all natural flavor. Not sweet no fake ingredients.” It also carries added digestive enzymes and probiotics, plus amino acids, so it is doing more than just ticking the protein box.
Be honest with yourself about the calorie count here. At 180 calories, this is a protein shake, not a mass gainer — if you are seriously underweight, you will need to add food or a heavier gainer on top. The other thing to note is that it costs more per bottle than a powder serving would, so buying a tub of gainer is the cheaper route if volume is what you need.
Best for steady protein: swap a mediocre lunch for one bottle and you get 30 g of protein plus a creamy vanilla drink, with no scoop or shaker involved.
The trade-off: at 180 calories per bottle, this leans protein-first, so pair it with food if a serious calorie surplus is the real goal.
Choose it if: clean ingredients, no added sugar and a genuinely good vanilla flavor matter more to you than a giant calorie number.
Pass if: you need maximum calories in minimum volume — the heavier gainers further down do that job.
3. MuscleMeds CARNIVOR Mass Gainer Chocolate Peanut Butter
Beef protein, 125 grams of carbs and zero lactose — the gainer for a dairy-sensitive bulk.
This one is for the person who wants serious mass-building numbers but cannot handle lactose. Each serving delivers 50 grams of beef protein isolate, 125 grams of carbs, over 700 calories, and it is lactose free, halal certified, with 0 fat and 0 sugar. That protein count is more than double what the BOOST bottle gives you per serving, at 50 grams against 22 grams. It is a powder for someone chasing muscle mass, not a light between-meal sip.
Flavor is where this shake divides opinion, and the chocolate peanut butter fans are loud. One buyer’s review sums it up: “Two servings = 100g of 275g protein goal.” The sweet, thick chocolate-peanut-butter taste is closer to a dessert shake than a plain protein drink, which is why people stick with it. Mix it very cold for the smoothest result, and blend rather than shake if you can.
The honest wobble here is how it mixes. It can go clumpy even after a good blend, and consistency between batches has been an issue for some buyers, with at least one report of a batch that tasted off. Treat the chocolate peanut butter as a treat you look forward to rather than a neutral daily staple, and you will get along with it fine.
Where it earns its place: 50 g of beef protein, 125 g of carbs and zero lactose per serving make this a genuine mass builder for dairy-avoiders.
Mixed signals: clumping and batch-to-batch consistency are the real gripes — blend it cold and give it a good shake for the best texture.
Reach for this if: you are lactose intolerant, want beef-based protein, and a thick chocolate peanut butter shake sounds like a reward.
Think twice if: you need a smooth, consistent mix every single time — clumping is the recurring complaint.
4. Optimum Nutrition Serious Mass Chocolate 6LB
The everyday bulk staple that pushes past 1,200 calories per two-scoop serving.
For a lot of underweight people, this is the powder that finally moves the number on the scale. Two scoops deliver over 1,200 calories, 50 grams of blended protein and more than 250 grams of carbohydrates, plus 20+ essential vitamins and minerals. That is the daily-shrink framing that matters: real food plus a shake like this is how you add a big block of calories without sitting down to a sixth meal. It appeals to hardgainers who simply cannot eat enough, because it does not ask them to chew any more.
The chocolate flavor is the reason people tolerate the volume. Owners regularly say it mixes well with milk or water and tastes like a dessert, and plenty add peanut butter, oats or a banana to push the calories higher still. The maker also describes it as a customizable shake base, and that is exactly how people use it. The quality is the other thing buyers latch onto — with so many people on it for so long, the formula has a track record that a newer brand does not.
Here is the part to plan around. A serving this big is thick and sweet, and the mixability is where opinions split — add too much powder to your shaker and it clumps. The common workaround is to split the serving across the day, using half a serving at a time to avoid bloat and to keep the drink thinner. If you hate overly sweet drinks, mix it with water rather than milk to tone it down.
What Makes It A Bulk Staple
- Over 1,200 calories, 50 g protein and 250 g+ carbs per two-scoop serving for serious size.
- 20+ vitamins and minerals, including vitamin C and zinc.
- A shake base you can load with milk, fruit, peanut butter or nuts to push calories higher.
Where It Pushes Back
- The full serving is thick and sweet; split it into halves to keep it drinkable.
- Powder this heavy clumps if you overload a shaker — blend it or use less powder per shake.
- It is a supplement, not a shortcut; real food and regular training still do the heavy lifting.
Pick this if: you need a proven calorie monster and you are ready to split the serving to keep it comfortable.
Not for you if: you want a single easy scoop of light pre-made shake — this is a heavy, sweet, high-carb blend.
5. BOOST Very High Calorie Variety Pack 24 pk
The same 530-calorie bottle, now in vanilla, chocolate and strawberry so it never gets boring.
Same hunger-beating calories as the chocolate pack that leads the list, but this one lets you rotate flavors. Each 8 fl oz bottle still carries 530 calories, 22 grams of protein and 26 vitamins and minerals. The trio of vanilla, chocolate and strawberry is the point here — if you are drinking two a day for weeks, flavor fatigue is real, and having three to switch between keeps the habit alive. You also get 24 bottles rather than 12, which suits a longer run or a household with more than one person on it.
For someone caring for an elderly parent or a patient with a poor appetite, variety is often what keeps them drinking. The maker even suggests adding it to coffee if you want to sneak extra calories in. Texture is consistent with the rest of the BOOST Very High Calorie range — thick, so pour it over ice and go slow. The flavor rotation is the whole reason to pick this pack over the single-flavor box.
What you give up is predictability. With three flavors in play, you might find one you do not love, and the thicker body still needs the same sipping care. One occasional note: a few owners mention some queasiness if it is drunk too fast on an empty stomach, so drink it with or after a meal.
Variety is the point: three flavors and 24 bottles keep a daily habit from turning into a chore, while still delivering 530 calories and 22 g protein per bottle.
Keep in mind: the drink is thick by design, and drinking it fast can upset some stomachs — sip it slowly with food.
Suits you if: you or someone you care for drinks these daily and flavor boredom has been the reason the habit slips.
Skip if: you only want chocolate — the single-flavor pack gives you exactly that with less choice to manage.
6. Ronnie Coleman King Mass XL Dark Chocolate
A serious 60-gram protein, 1,000-plus calorie powder in a big-bulk bag.
If you want a gainer you can pour from a single large bag for months, this one is built for that. Each serving carries 60 grams of protein, 180 grams of carbohydrates, 1,000+ calories, plus creatine and glutamine. That protein number is on par with the Optimum Pro Gainer and higher than the CARNIVOR’s 50 grams, so it competes at the top of the protein table. The chocolate flavor is designed to taste like a milkshake, and it goes into milk, water or a smoothie with ease.
Owners, especially long-time gainer users, often say it mixes better than most whey powders despite how many calories are packed into it. That matters, because a lot of dense gainers turn into a brick in the shaker. It also brings creatine in the mix, which saves you buying it separately. The quality and value get steady praise, and the brand’s history in the space is a comfort for people who want a formula that has been around.
Taste is the split here. Dark chocolate is the favorite, but cookies and cream draws complaints about a chemical aftertaste, and some say the flavor is not strong enough without a spoon of peanut butter. The resealable bag has also come under fire for a zip that fails, so keep a chip clip handy. It does the calorie job — just be ready to doctor the flavor if chocolate on its own is not enough for you.
The big number: 60 g protein, 180 g carbs and 1,000+ calories per serving is a full-on mass gainer for committed bulkers.
Flavor roulette: dark chocolate earns the love while cookies and cream divides people, so pick the flavor carefully — and keep a clip for the bag.
Best for: committed bulkers who want a big protein number and a long-lasting bag of gainer.
Watch out for: flavor inconsistency between varieties and a bag seal that can fail — pick dark chocolate and clip the top.
7. Optimum Nutrition Gold Standard Pro Gainer Vanilla Custard
A protein-first gainer with 60 grams of protein and under 8 grams of sugar per serving.
This pick is for the person who wants to add muscle and keep sugar low. Each serving delivers 650 calories, 60 grams of protein and more than 80 grams of carbohydrates, with less than 8 grams of sugar. The protein comes from seven sources, which the maker says release over hours instead of all at once. Vanilla custard is the flavor, and it floats far lighter than the very thick mass gainers on this list.
Taste is clearly where it lives up to the hype, and gains come with it. Customers note gaining steadily on one shake a day and staying for the vanilla custard flavor. It mixes easily in water or milk and is easy on the stomach, which is rare for a 60-gram-protein powder. If the sweet, thick style of most gainers puts you off, this one is the runny, mellow alternative.
The trade-off is that it is arguably the most expensive route here, and the sugar-free leaning means the calories are more protein-oriented than the mega-carbohydrate gainers. You may need a second serving across the day, so factor that in. A few buyers also find the container huge for what it holds, but that is a packaging note, not a performance one.
Lean and protein-heavy: 650 calories, 60 g of protein and under 8 g of sugar make this the pick for clean bulking.
Worth knowing: it is a pricier, protein-first option, so expect to use it more than once a day to hit big calorie targets.
Choose it when: taste, a mellow vanilla flavor and a high-protein, low-sugar formula are your priorities.
Skip it when: you need the cheapest calories possible or a big carbohydrate load — the Serious Mass and King Mass cover that.
Know the Specs
Calories Per Serving
Calories per serving is the fuel number — it tells you how much of your daily surplus arrives in one drink. A ready-to-drink bottle here carries 530 calories, while a two-scoop powder serving can pass 1,200. The higher the number, the easier it is to hit a surplus, but the thicker and heavier the drink tends to be, so split large servings across the day.
Protein vs. Carbs
Protein builds and repairs muscle; carbs top up energy and push the calorie total up. Protein per serving across this list runs from 22 grams (the ready-to-drink BOOST) to 60 grams (the powder gainers). Carb counts range from over 80 grams to 180 grams per serving. If muscle is the goal, weight protein higher; if you simply need to put on weight, carbs do a lot of the calorie work.
Ready-to-Drink vs. Powder
A ready-to-drink bottle is pre-mixed — open and sip, with no measuring and no cleanup. A powder is cheaper per serving and hits higher calorie numbers, but asks you to scoop, blend and wash up. If convenience keeps you consistent, pick the bottle; if cost per serving and higher calories matter more, pick the powder.
Texture and Mixability
Dense calorie drinks are naturally thicker. Many of these products suggest chilling over ice or sipping slowly to thin them out. Powders can clump if you overload the shaker, so blend them or use less powder per shake. Texture is often why people quit a gainer, so try a small pack before committing to a big tub.
Common Questions
Is a weight gain protein shake better than just eating more food?
How many calories should a gainer shake have per serving?
Can I drink a weight gain protein shake if I am lactose intolerant?
Will a mass gainer make me gain fat instead of muscle?
How do I stop a thick gainer shake from making me feel bloated?
Do these protein shakes have added sugar?
Can I use a weight gain protein shake as a meal replacement?
Which is easier to mix, the powder gainers or the ready-to-drink bottles?
How long does an open bag or pack of shakes stay usable?
The Bottom Line
For most people with a small appetite who simply need calories to go in, the BOOST Very High Calorie Chocolate is the easiest win — 530 calories and 22 grams of protein in a ready-to-drink bottle that needs no mixing and gets finished, which matters more than any label number. If you want a clean protein-first shake with no added sugar, grab the Jocko Fuel High Protein Shakes. And if you are serious about bulking and want maximum calories per serving, the Optimum Nutrition Serious Mass delivers over 1,200 calories to fuel a real surplus. Pick the format you will actually stick with — bottle or powder — and the surplus gets easier to hit.
How we choose
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of October 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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