Best Weight Gainers 1000 Calories Per Serving (2026)

By AnilKK | Certified Nutrition & Fitness Coach (INFS) | Updated April 2026

The best weight gainers 1000 calories per serving in 2026 are: ON Serious Mass, Dymatize Super Mass Gainer, Naked Mass, MuscleTech Mass-Tech Extreme, BSN True Mass 1200, Transparent Labs, NutraBio, and Rule 1. Here’s my honest breakdown of each, as a certified nutrition coach with years of client experience behind these recommendations.

I’ll be straight with you from the start — most weight gainers on the market are overpriced bags of maltodextrin dressed up with impressive-sounding labels.

I’ve been a certified nutrition and fitness coach for years, and I’ve helped hundreds of people navigate the supplement aisle. Mass gainers come up constantly, and so does the confusion around them. What’s actually in these things? Do I really need 1,000 calories in a shake? And which brands are worth spending money on?

This guide answers all of that. I’ve gone through the nutrition labels, the ingredient lists, the third-party testing certifications, and the Amazon best-seller data so you don’t have to. What you’ll find below are five products I’d actually recommend to a real person — not five products chosen because they paid to be here.

Before we get into the picks, there’s one thing I want you to read first.

Do You Actually Need a Mass Gainer?

Short answer: Maybe.

Weight gainers are not magic. They’re concentrated calorie sources — and they only help if you’re genuinely struggling to eat enough whole food to stay in a calorie surplus. For most people, that means one of these situations applies:

• You’re a true hardgainer with a fast metabolism that burns through everything you eat
• You’re an athlete training so intensely that whole food alone can’t keep up with your calorie burn
• You’re recovering from illness or surgery and need to restore body weight quickly
• You physically cannot eat large volumes of food, but you need a high-calorie intake

If none of those describe you, a standard protein shake for muscle gain with a calorie-dense, whole food diet will take you further than a mass gainer. There’s no reason to add 1,200 empty calories to a diet that’s already working.

But if you do fall into one of those categories, a good mass gainer with 1,000+ calories per serving can genuinely change the trajectory of your progress. The key is choosing one with quality ingredients, third-party testing, and a protein blend that actually does something — not just a cheap carb dump in a fancy tub.

Important note: As with any dietary supplement, mass gainers are not regulated the same way as food by the FDA. Third-party certifications like NSF and Informed Sport exist specifically to fill that gap — always look for them.

What to Look for in a High-Calorie Mass Gainer

Before I get to the products, here’s what I actually check when evaluating a mass gainer. These are the things competitors won’t tell you.

1. Protein Source Quality Matters More Than Protein Quantity

A product boasting “80g of protein” isn’t impressive if that number only applies when you add 20oz of skim milk to it. Always check the protein per serving in water alone — and look at where that protein comes from.

Multi-source blends that include both fast-digesting proteins (like whey concentrate or hydrolyzed whey) and slow-digesting proteins (like micellar casein or milk protein isolate) keep your muscles fed over a longer window. A single-source product delivers one spike and then nothing.

2. Carb Source Tells You a Lot About a Brand

Maltodextrin is the most common carb base in mass gainers, and it’s not inherently bad — it’s fast-digesting, which is useful post-workout. But there’s a quality difference between wheat-derived maltodextrin and organic tapioca maltodextrin. And there’s a real difference between a product that uses only maltodextrin versus one that includes whole oat flour or isomaltulose for sustained energy.

3. Third-Party Testing Is Non-Negotiable for Athletes

The supplement industry is largely unregulated. A product can claim whatever it wants on the label unless an independent lab has verified it. The two certifications worth trusting are:

• NSF Certified for Sport — the most rigorous standard, tests every batch for banned substances, heavy metals, and contaminants
• Informed Sport / Informed Choice — tests each batch at LGC, a world-class anti-doping laboratory

If you’re a competitive athlete, these certifications are not optional.

4. The “2,000 Calorie” Marketing Trick

This one catches people out constantly. Several mass gainers advertise 2,000+ calories per serving on the front of the tub — and then in tiny font on the back, you’ll see “when mixed with 20 oz of skim milk.” Add 300+ calories of milk to any mass gainer and the numbers change dramatically.

I’ll flag this wherever it applies in the reviews below. Always check the calories-per-serving figure for the powder mixed with water — that’s the honest number.

5. The Protein-to-Carb Ratio

Most mass gainers run between 1:4 and 1:5 protein to carbs. That’s fine for the goal — you need the carbs for energy and glycogen replenishment. But be wary of anything skewed too far toward carbs with no quality protein to match. You want muscle gain, not just scale weight.

For reference, the International Society of Sports Nutrition (ISSN) recommends 1.4–2.0g of protein per kilogram of bodyweight daily for athletes engaged in resistance training.

The 8 Best Weight Gainers 1000 Calories Per Serving (2026)

Here’s a quick orientation before we dive into the best weight gainers 1000 calories per serving on this list:

Calories listed per serving mixed with water unless otherwise noted.

1. Optimum Nutrition Serious Mass — Best Overall

Features at a Glance:

• ✅ Informed Sport certified (banned substance tested)
• ✅ 5g creatine monohydrate included
• ✅ Multi-phase protein (Whey + Casein + Egg)
• ✅ Zero added sugar
• ✅ 25 vitamins and minerals
• ✅ Available on Amazon
• ❌ Requires blender — won’t mix well in a shaker cup
• ❌ Uses artificial sweeteners (Sucralose, Acesulfame Potassium)

Flavors: Chocolate, Vanilla, Strawberry, Banana, Chocolate Peanut Butter

Sizes & Price: 6 lb ($43.99 / 8 servings) | 12 lb (~$69.99 / 16 servings) Price per serving: ~$4.50 | Price per 100 calories: ~$0.36

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The world’s #1-selling mass gainer. For good reason.

If you’ve been in any gym for more than a week, you’ve seen this tub. Optimum Nutrition Serious Mass has been the benchmark for high-calorie mass gainers since it launched, and it still earns that position in 2026.

What makes it the best overall pick isn’t one standout feature — it’s the combination of a reliable macro profile, a proven multi-phase protein blend, Informed Sport certification, and a price that doesn’t make you wince every time you reorder.

The nutrition profile:

Each 2-scoop serving (mixed with water) delivers 1,260 calories, 50g of protein, 253g of carbohydrates, and 5g of creatine monohydrate. There’s no added sugar in the formula, which is genuinely impressive at this calorie density. The protein comes from a blend of whey concentrate, calcium caseinate, and egg albumin — fast, medium, and slow-digesting sources working together to keep muscle protein synthesis elevated.

The 5g of creatine monohydrate is a real bonus. Research published in peer-reviewed literature on creatine consistently shows that creatine supplementation supports strength and lean mass gains — it’s arguably the most evidence-backed addition a mass gainer can include.

Nutrition Facts (Per 2-Scoop Serving / Water)

Key Ingredients: Maltodextrin, Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Egg Albumen, Sweet Dairy Whey), Natural & Artificial Flavors, Vitamin & Mineral Blend, Creatine Monohydrate, L-Glutamine, Glutamine Peptides, Choline, Inositol, PABA, MCTs, Acesulfame Potassium, Sucralose.

Allergens: Milk, Egg, Soy (Lecithin).

My take: This is the product I’d recommend to someone who has never used a mass gainer before and wants a trusted starting point. It’s not the cleanest formula on the market (it uses artificial sweeteners and wheat-based maltodextrin), but it delivers what it promises, it’s been independently tested, and the 5g creatine inclusion makes it genuinely better value than the label price suggests. Start with half a serving if you have a sensitive stomach — 1,260 calories in one shake is a lot for a new user.

ON Serious Mass: “I’ve been using this for three months and put on 8 pounds. I was skeptical at first but the creatine and calorie combination is hard to argue with.” — Verified Amazon buyer

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2. Dymatize Super Mass Gainer — Best Value

Features at a Glance:

• ✅ Informed Choice certified (banned substance tested)
• ✅ 5-source protein blend — best protein diversity on the list
• ✅ 5.1g Leucine per serving (activates muscle protein synthesis)
• ✅ Available on Amazon with Subscribe & Save
• ✅ Fruity Pebbles flavor is genuinely enjoyable
• ❌ Only 1g creatine (vs 5g in ON Serious Mass)
• ❌ Uses artificial sweeteners and flavors
• ❌ Requires blender for full serving

Flavors: Rich Chocolate, Gourmet Vanilla, Fruity Pebbles

Sizes & Price: 6 lb ($33.98 Subscribe & Save / 8 servings) Price per serving: $4.25 | Price per 100 calories: $0.33

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The best cost-per-calorie on the list. With a 5-source protein blend that punches above its price.

Dymatize doesn’t get as much spotlight as Optimum Nutrition, but among coaches and serious athletes, Super Mass Gainer is held in extremely high regard. The reason: the protein blend.

Where most mass gainers use 2–3 protein sources, Dymatize uses five: whey protein concentrate, milk protein isolate, whey protein isolate, hydrolyzed whey protein, and micellar casein. That’s fast, medium, medium-fast, very fast, and slow-digesting proteins in one scoop. Your muscles are getting amino acids from the moment you finish the shake until several hours later.

At $34 for 8 servings (with Subscribe & Save on Amazon), the cost per serving is the lowest on this list for a product of this quality.

Nutrition Facts (Per 2.5-Cup Serving / Water)

Key Ingredients: Maltodextrin, Protein Blend (Whey Protein Concentrate, Milk Protein Isolate, Whey Protein Isolate, Whey Protein Hydrolysate, Micellar Casein), Sunflower Creamer, Creatine Monohydrate, Fructose, Natural & Artificial Flavors, Vitamin & Mineral Blend, Gum Blend (Cellulose, Xanthan, Carrageenan), Soy Lecithin.

Allergens: Milk, Soy.

My take: For the person who cares about getting the most out of every gram of protein they consume, Dymatize wins. The 5-protein blend with 5.1g of leucine per serving is sophisticated nutrition at a budget price. Informed Choice certification means it’s safe for competitive athletes, too. My only complaint is the creatine dose — at 1g, you’re not hitting the clinically effective range. If you go with Dymatize, add a separate 3–4g creatine monohydrate scoop to your shake. The total cost still comes in cheaper than most competitors.

Dymatize Super Mass Gainer: “Best value on the market. The Fruity Pebbles flavor is actually enjoyable, and I noticed better muscle fullness within a few weeks.” — Verified Amazon buyer

Check Price on Amazon | Check Price on Dymatize

3. Naked Mass — Best Clean Ingredients

Features at a Glance:

• ✅ NSF Certified for Sport — highest testing standard
• ✅ Grass-fed whey protein
• ✅ Organic tapioca maltodextrin (gluten-free carb source)
• ✅ Zero artificial sweeteners, flavors, or colors
• ✅ Vegan option available (Naked Vegan Mass)
• ✅ Highly versatile — unflavored mixes into anything
• ❌ No creatine
• ❌ Minimal vitamins and minerals
• ❌ Higher price per serving (~$6.00)
• ❌ Chocolate version has 58g sugar (from coconut sugar)

Flavors: Unflavored, Vanilla, Chocolate, Strawberry, Chocolate Peanut Butter

Sizes & Price: 8 lb (~$60–$70 / 11 servings) Price per serving: ~$6.00 | Price per 100 calories: ~$0.48

Vegan Option — Naked Vegan Mass: Pea Protein + Brown Rice Protein + Organic Tapioca Maltodextrin. 1,230 calories, 50g protein, 248g carbs, 10.3g BCAAs. NSF Certified, Non-GMO, Soy-Free, Gluten-Free, Dairy-Free.

Buy on Amazon

Three ingredients. NSF Certified. Grass-fed protein. This is what “clean” actually means.

Every supplement brand claims to use “clean” or “natural” ingredients. Naked Mass is one of the very few that actually means it.

The unflavored version contains exactly three things: organic tapioca maltodextrin, grass-fed whey protein concentrate (Naked Whey), and micellar casein (Naked Casein). That’s it. No artificial sweeteners. No sucralose. No acesulfame potassium. No flavoring agents. Nothing your body doesn’t need.

The certification matters here, too. Naked Mass holds NSF Certified for Sport status — the most rigorous third-party testing standard in the supplement industry. Unlike Informed Sport (which tests each batch), NSF conducts ongoing monthly testing and verifies that what’s on the label is exactly what’s in the tub. If you’re a competitive athlete who gets drug tested, this is the standard you want.

Nutrition Facts (Per Serving / Unflavored with Water)

Flavored versions: Chocolate adds ~110 calories and uses organic coconut sugar (not sucralose). Vanilla uses organic coconut sugar and natural vanilla. Still only 4–5 total ingredients.

Key Ingredients (Unflavored): Organic Tapioca Maltodextrin, Naked Whey (Grass-Fed Whey Protein Concentrate), Naked Casein (Micellar Casein).

Allergens: Milk. Gluten-Free | Soy-Free | GMO-Free | rBGH/rBST Free.

Naked Mass: “I love that I can actually read the ingredient list. Three ingredients, clean protein, and it mixes fine with almond milk and banana.” — Verified Amazon buyer

My take: If ingredient quality is your priority, Naked Mass isn’t even close to the competition — it’s in a different category entirely. The NSF certification alone justifies the price premium for athletes who get tested. I’d recommend the unflavored version over the chocolate (the chocolate has significantly more sugar due to the coconut sugar, which, while natural, is still sugar). Blend it with banana, oat milk, and peanut butter, and you’ll have a better-tasting shake than anything artificially flavored. Just be aware you’ll want to add a separate creatine supplement since none is included. I cover the best whey protein isolates separately if you want to understand the protein quality spectrum in more depth.

Check Price on Amazon | Check Price on Naked Nutrition

Features at a Glance:

• ✅ Highest calorie potential on the list (with milk)
• ✅ Multi-phase carb complex with oat bran and isomaltulose
• ✅ 5g creatine monohydrate
• ✅ 20 vitamins and minerals
• ✅ Consumer Reports Oct 2025 — no detectable lead
• ⚠️ “2000 calorie” claim requires 20oz skim milk — not powder alone
• ⚠️ “80g protein” claim also includes milk contribution
• ❌ Highest price per serving at ~$9.00 (6 lb)
• ❌ Very thick — blender required

Flavors: Vanilla Milkshake, Chocolate

Sizes & Price: 6 lb ($44.99 / 5 servings) | 12 lb | 20 lb ($99.99 /17 servings) Price per serving: $9.00 (6 lb) / $5.90 (20 lb) | Price per 100 calories (water): $0.47

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4. MuscleTech Mass-Tech Extreme 2000 — Best for Extreme Hardgainers

The highest calorie option on the list. But read this caveat first.

Let me be upfront about something before you get excited by the “2000 calorie” headline on this tub.

That figure — 2,000+ calories per serving — is measured when you mix the powder with 20 oz of skim milk. The milk adds roughly 300–400 calories on its own. With water alone, you’re looking at approximately 1,270 calories and 63g of protein per serving. That’s still a lot — but it’s not 2,000.

This isn’t a criticism of MuscleTech as a brand — it’s standard industry practice that I want you to be aware of. The same applies to the 80g protein claim: that’s the number with milk included. Powder only gives you 63g.

With that said, for the person who genuinely needs 4,000+ calories a day and is struggling to get there, Mass-Tech Extreme is the most powerful option on this list. The multi-phase carb complex (maltodextrin + oat bran + isomaltulose) is notably more sophisticated than the simple maltodextrin used by most competitors, providing both immediate and sustained energy release. The 5g creatine dose matches Optimum Nutrition’s. And Consumer Reports’ October 2025 testing found no detectable lead — reassuring for a product in this category.

Nutrition Facts (Per 6-Scoop Serving)

Key Ingredients: Multi-Phase Carb Complex (Maltodextrin, Oat Bran, Isomaltulose), Premium Whey Protein Matrix (Whey Protein Concentrate, Hydrolyzed Whey Protein Isolate, Whey Protein Isolate), 5g Creatine Monohydrate, 20 Vitamins & Minerals.

Allergens: Milk, Soy.

MuscleTech Mass-Tech Extreme: “I use it with whole milk and I’m definitely gaining — this is the real deal for someone who burns through everything they eat.” — Verified Amazon buyer

My take: This product is right for a specific type of person — the genuine hardgainer who struggles to get above 3,000 calories a day on whole food alone, and who will use milk as their mixing liquid consistently. For that person, the multi-phase carb blend and the sheer calorie density make this the most effective option here. For everyone else, you’re paying a premium (especially in the 6 lb size) for a benefit you won’t fully use. If you do go with Mass-Tech Extreme, buy the 20 lb size — the price per serving drops significantly and makes it genuinely competitive.

Check Price on Amazon | Check Price on MuscleTech

5. BSN True Mass 1200 — Best Taste and Fiber

Features at a Glance:

• ✅ Best taste on the list — BSN’s legendary flavor technology
• ✅ 7-source protein blend (most diverse on the list)
• ✅ Whole oat flour included in carb blend
• ✅ Excellent fiber source (6–16g per serving)
• ✅ MCTs included
• ✅ Glutamine peptides included
• ✅ GMP certified facility, Made in USA
• ❌ No creatine
• ❌ Highest fat content (16g — though quality fat)
• ❌ Contains Wheat — not suitable for gluten-sensitive users
• ❌ Not Informed Sport or NSF certified

Flavors: Chocolate Milkshake, Vanilla Ice Cream, Strawberry Milkshake

Sizes & Price: 5.82 lb / 10.38 lb ($79.99 /15 servings) Price per serving: $5.33 | Price per 100 calories: $0.43

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Seven protein sources. Whole oat flour. And the best-tasting shake on this list.

BSN built its reputation on Syntha-6, which has been consistently rated among the best-tasting protein powders on the market for years. True Mass 1200 applies that same flavoring technology to a full-calorie mass gainer — and the result is a shake that actually tastes like a milkshake rather than chalky sweetened powder.

Beyond taste, the nutrition profile is legitimately impressive. True Mass 1200 uses seven distinct protein sources, including egg albumin and glutamine peptides, which none of the other products on this list include. The carbohydrate blend incorporates whole oat flour alongside maltodextrin, giving you a meaningful 6–16g of dietary fiber per serving — something almost every other mass gainer completely ignores.

The 16g of fat per serving is higher than competitors’, but that fat comes partly from MCTs (medium chain triglycerides), which are a quality energy source that the body processes differently from regular fats.

Nutrition Facts (Per 3-Scoop Serving / Water)

Key Ingredients: Complex Carbohydrate Blend (Maltodextrin, Whole Oat Flour), Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Milk Protein Isolate, Whey Protein Isolate, Micellar Casein, Egg Albumin, Hydrolyzed Whey Protein, Glutamine Peptides), Creamer (Sunflower Oil, Corn Syrup Solids, MCT Powder), Cocoa (Processed with Alkali), Natural & Artificial Flavors, Polydextrose, Gum Blend, Acesulfame Potassium, Sucralose.

Allergens: Milk, Egg, Wheat, Soy.

BSN True Mass 1200: “The Chocolate Milkshake flavor is the best-tasting mass gainer I’ve ever tried. I actually look forward to drinking it.” — Verified Amazon buyer

My take: If taste is what’s going to determine whether you actually drink this shake every day — and compliance matters more than most people admit — True Mass 1200 is the one. Seven protein sources, including egg albumin is more complete than anything else here, and the 16g of fiber per serving is genuinely unusual for a mass gainer. My two notes: no creatine (add it separately) and the wheat content rules it out for anyone with gluten sensitivity. For everyone else who prioritizes taste and protein diversity, this earns its spot on the list.

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6. Transparent Labs Mass Gainer — Best Whole-Food Formula

Features at a Glance:

• ✅ No artificial sweeteners, colors, or flavors — sweetened with stevia and monk fruit
• ✅ Grass-fed whey protein concentrate — higher quality than standard whey
• ✅ 3g creatine monohydrate per serving
• ✅ Whole-food carb sources: organic tapioca, oat flour, and sweet potato
• ✅ MCTs from coconut milk powder
• ✅ Prebiotic fiber (VitaFiber) — rare in mass gainers
• ✅ Full certificates of analysis available on their website
• ❌ Only 750–770 calories per serving — lower than most on this list
• ❌ Higher price per serving (~$5.30)
• ❌ Can be harder to find in stock
• ❌ Stevia aftertaste reported by some users

Flavors: Chocolate Glaze, Sweet Vanilla, Chocolate Peanut Butter

Sizes & Price: 6.42 lb (~$79.99 / 15 servings) | Price per serving: ~$5.30 | Price per 100 calories: ~$0.68

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The cleanest whole-food formula on this list. But read the calorie caveat first.

Transparent Labs has built a reputation in the supplement industry for doing one thing consistently: putting exactly what they say on the label, with no hidden blends, no filler ingredients, and no artificial additives. Their mass gainer is the most visible proof of that commitment.

Where every other product on this list uses standard maltodextrin as its primary carb source, Transparent Labs builds its carbohydrate blend from three whole-food sources: organic tapioca maltodextrin, oat flour, and sweet potato powder. Add in VitaFiber (a prebiotic soluble fiber) and MCTs from coconut milk, and you have a mass gainer that genuinely stands apart from the category in terms of ingredient philosophy.

There’s one thing you need to know upfront, however. At 750–770 calories per serving, this product delivers fewer calories than most others on this list — and doesn’t hit the 1,000-calorie threshold that defines this category. I’ve included it because the formula quality is genuinely superior and because many people are better served by two 750-calorie shakes throughout the day rather than one 1,260-calorie serving that overwhelms their digestive system. If pure calorie density is your priority, look at ON Serious Mass or Dymatize. If ingredient quality is your priority above all else, this is your product.

Nutrition Facts (Per 2-Scoop Serving / Water)

Key Ingredients: Organic Tapioca Maltodextrin, Grass-Fed Whey Protein Concentrate, Coconut Milk Powder, MCT Oil Powder, VitaFiber (prebiotic soluble fiber), Creatine Monohydrate, Oat Flour Powder, Sweet Potato Powder, Natural Flavors, Stevia Extract, Sunflower Lecithin.

Allergens: Milk, Coconut (tree nut), Wheat (Cookies & Cream flavor only).

What customers say: Verified buyers describe it as the cleanest mass gainer they’ve tried and praise the whole-food ingredient list. The Sweet Vanilla flavor consistently receives higher marks than chocolate. The main complaint is occasional stock availability issues — when it sells out, it tends to stay out for weeks.

My take: For the nutrition-conscious athlete who reads every label and refuses to put artificial sweeteners in their body, Transparent Labs is the only option at this calorie density. The prebiotic fiber and MCT inclusion are genuinely unusual for this category. My one honest note: at 750 calories per serving versus 1,260 for ON Serious Mass, if maximum calorie density per shake is your goal, this isn’t it. But if you’re stacking two shakes per day and want the cleanest possible formula for each of them, this earns top marks. Add a separate creatine supplement to complement the 3g included — you’ll want to reach the clinically effective 5g dose.

Check Price on Amazon | Check Price on Transparent Labs

7. NutraBio Extreme Mass — Best for Transparent Label Standards

Features at a Glance:

• ✅ Third-party tested — fully transparent label, no proprietary blends
• ✅ Premium WPC80 protein (highest-grade whey concentrate available)
• ✅ 70/30 split: WPC80 for fast absorption, micellar casein for sustained release
• ✅ Gluten-free, soy-free, vegetarian, kosher, and halal certified
• ✅ Made in the USA — GMP-certified facility
• ✅ Lowest fat content on the list (6g)
• ✅ Scalable servings — 1 to 4 scoops depending on your needs
• ❌ Only 650 calories per serving — well below 1,000
• ❌ No creatine included
• ❌ Fewer flavors available than most competitors
• ❌ Not Informed Sport or NSF certified

Flavors: Chocolate, Vanilla, Strawberry Pastry

Sizes & Price: 6 lb (~$48 / ~16 servings) | Price per serving: $3.00 | Price per 100 calories: $0.46

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No proprietary blends. No filler proteins. No compromises on transparency.

NutraBio is one of the few supplement companies in the industry that publishes its full manufacturing standards as a point of brand identity — not just as marketing copy. Every NutraBio product carries a fully disclosed ingredient list with exact dosages of every compound. No proprietary blends. No “protein matrix” labels hiding inferior sources.

For Extreme Mass, that transparency reveals something worth paying attention to: the protein source is listed as WPC80, which means whey protein concentrate at 80% purity — the premium grade used by serious supplement manufacturers. Most mass gainers simply say “whey protein concentrate” on the label without disclosing the purity grade. WPC60 or WPC34 — lower-grade concentrates — are significantly cheaper and far less bioavailable. NutraBio tells you exactly what grade you’re getting, and it’s the best one.

The protein blend splits 70% fast-absorbing WPC80 with 30% micellar casein, designed to feed your muscles from the moment you finish the shake through to three hours later. That’s a scientifically sound combination backed by peer-reviewed research — and it’s built into every serving without you needing to add a separate slow-digesting protein.

The honest caveat: at 650 calories per serving, Extreme Mass sits below the 1,000-calorie threshold this list targets. Like Transparent Labs above, I’ve included it because the formula quality — especially the protein sourcing — is genuinely above most 1,000-calorie products. If you need maximum calories per shake, look elsewhere. If you need maximum protein quality transparency and clean macros, NutraBio is the choice.

Nutrition Facts (Per 4-Scoop Serving / Water)

Key Ingredients: High-Polymerization Maltodextrin, Protein Blend (Whey Protein Concentrate WPC80, Micellar Casein), MCT Coconut Powder, Natural Flavors, Vitamin & Mineral Blend.

Allergens: Milk. Gluten-Free | Soy-Free | Vegetarian | Kosher | Halal.

What customers say: Amazon reviewers highlight the clean taste and transparent ingredient list as their main reasons for repeat purchasing. The Strawberry Pastry flavor in particular draws strong praise — several reviewers note it tastes genuinely good blended with a few frozen strawberries. The most common criticism is the relatively lower calorie count per serving for those used to 1,200+ calorie gainers.

My take: NutraBio is the product I would recommend to anyone who has been burned before by vague supplement labels and wants to know precisely what they’re putting in their body. The WPC80 sourcing and the full-disclosure label are genuinely rare in this category. Add a 5g creatine supplement separately — NutraBio’s own creatine is excellent — and you have an extremely clean bulking stack at a very reasonable price. Just go in knowing the calorie target per serving is lower, and plan your daily intake accordingly.

Check Price on Amazon | Check Price on NutraBio

8. Rule 1 Mass Gainer — Best Budget Pick Over 1,000 Calories

Features at a Glance:

• ✅ Informed Choice certified — banned substance tested
• ✅ All-whey protein blend (3 sources: concentrate, isolate, hydrolysate)
• ✅ 1,220+ calories per serving with water
• ✅ No creamers, no soy protein, no amino spiking
• ✅ GMP-certified US manufacturing facility
• ✅ Carb10™ (pea starch) included — lower glycemic carb source
• ✅ Available in large sizes with strong price-per-serving value
• ❌ Only 40g protein per serving — lowest on this list
• ❌ Only 1g creatine (below clinically effective range)
• ❌ Just 2 flavors: Chocolate Fudge, Vanilla Crème
• ❌ Uses artificial sweeteners (Sucralose, Acesulfame Potassium)
• ❌ 9g naturally occurring BCAAs (lower than most competitors)

Flavors: Chocolate Fudge, Vanilla Crème, Chocolate Peanut Butter

Sizes & Price: 5.5 lb ($27 / 8 servings) | 11 lb (~$40 / 16 servings) | Price per serving: $3.38 (11 lb) | Price per 100 calories: $0.28

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1,220 calories. Informed Choice certified. Under $3.50 per serving. Hard to beat on price.

Rule 1 Proteins is a brand that often flies under the radar compared to ON or Dymatize, but it has a serious following among high-calorie bulk seekers for one reason: it delivers over 1,220 calories per serving at a price per 100 calories that beats everything else on this list.

The protein blend is all-whey — three sources (concentrate, isolate, and hydrolysate), which means no casein and no egg. For a mass gainer this is unusual — most brands use a multi-source blend with casein for slow digestion. Rule 1’s approach gives you faster absorption across all protein fractions. That makes it a strong post-workout option but less ideal as a pre-sleep shake compared to products with casein.

The carbohydrate blend is more sophisticated than its price suggests. Alongside standard maltodextrin, Rule 1 uses organic rice bran and Carb10™ — a patented pea-starch-derived carb source with a lower glycemic index than maltodextrin alone. That’s a meaningful detail for anyone who finds high-GI carb loads cause energy crashes or digestive discomfort.

The Informed Choice certification seals it as a safe option for competitive athletes, which at this price point is rare.

Nutrition Facts (Per 2-Scoop Serving / Water)

Key Ingredients: Carbohydrate Blend (Maltodextrin, Organic Rice Bran, Carb10™ Pea Starch), Protein Blend (Whey Protein Concentrate, Whey Protein Isolate, Whey Protein Hydrolysate), Cocoa, Natural & Artificial Flavors, Soy/Sunflower Lecithin, Guar Gum, Sucralose, Acesulfame Potassium, Stevia Leaf Extract.

Allergens: Milk, Soy. No creamers | No soy protein | No banned substances.

What customers say: Amazon buyers flag the flavours as genuinely good — several mention the Vanilla Crème as easy to drink daily without flavour fatigue. Hard gainers specifically call it out as the product that finally helped them push past a calorie plateau. The consistent criticism is the 40g protein per serving, which some buyers describe as low for the calorie density.

My take: If your budget is tight and you need to consistently hit 1,200+ calories in a single shake, Rule 1 is the most cost-effective way to do it on this list. The Carb10™ inclusion shows genuine formulation thought at a price point where most brands just dump cheap maltodextrin. The protein count is the weakest point — at 40g versus 50-52g on most competitors, you’re trading some protein density for lower cost. The fix is simple: add a separate 20-25g whey protein scoop to each serving if protein targets are important. Total cost still comes in under most competitors. Buy the 11 lb size — the price per serving drops significantly over the 5.5 lb.

Check Price on Amazon | Check Price on Rule 1 Proteins

Full Comparison Tables

Core Nutrition Per Serving (With Water)

*With water only. Add 20oz skim milk, and calories rise to 2,000+, protein to 80g.

Protein Source Quality

Carbohydrate Source Quality

Third-Party Testing & Certifications

Price and Value Comparison

Who Should Buy Which Mass Gainer?

You’re new to mass gainers and want to keep it simple: → ON Serious Mass. Most trusted brand, Informed Sport certified, includes creatine, available everywhere.

You want the best cost-per-calorie with serious protein quality: → Dymatize Super Mass Gainer. Lowest cost on the list, 5-protein blend, Informed Choice certified. Add separate creatine.

You care about what’s in your supplement and want the cleanest label: → Naked Mass (Unflavored). Three ingredients, NSF certified, grass-fed whey. The only honest choice if you’re committed to clean supplementation.

You’re a plant-based athlete or dairy-intolerant: → Naked Vegan Mass. Same NSF certification, 50g pea + rice protein, 1,230 calories, zero dairy.

You’re a true hardgainer who genuinely needs 4,000+ calories a day: → MuscleTech Mass-Tech Extreme 2000 (mixed with milk). Multi-phase carbs, 5g creatine, highest calorie ceiling. Buy the 20 lb size for best value.

You’ve tried multiple mass gainers and quit because they taste terrible: → BSN True Mass 1200. The taste is genuinely different — BSN’s flavoring technology is in a class of its own. Seven protein sources and 16g fiber per serving are solid bonuses.

How to Take a Mass Gainer Properly

A few things I tell every client before they start:

Start with half a serving. One thousand-plus calories in a single shake is a lot. If you’ve never used a mass gainer before, start with half the recommended serving for the first week and let your digestive system adjust. Bloating and discomfort are common with full servings in the first days.

Use a blender, not a shaker cup. Every product on this list will clump in a shaker cup at full serving size. An electric blender for 30–45 seconds gives you a smooth, consistent shake. Add ice, frozen banana, or peanut butter to improve both texture and calorie density.

Timing matters — but not as much as total intake. Post-workout is the most common recommendation because your muscles are primed to absorb nutrients after training. Between meals is equally effective for overall calorie goals. Before bed works well for slow-digesting casein-containing blends like Naked Mass and BSN True Mass. Pick a time that works with your schedule and stick to it.

Don’t replace meals — add to them. A mass gainer is a supplement, not a meal. Consuming it on top of your existing whole food intake is what creates the calorie surplus needed for weight gain. If you’re drinking a mass gainer instead of eating real food, you’re doing it wrong.

Pair it with structured training. Without resistance training, the surplus calories from a mass gainer will go to fat, not muscle. I’ve written about treadmill workouts for weight management separately, but for mass gaining specifically, focus on progressive overload in the weight room three to five times per week.

How We Selected These Products

Every product on this list was evaluated against the same five criteria: calorie density per serving (with water, not milk), protein source quality and diversity, third-party testing certification, ingredient transparency (no proprietary blends), and real-world value based on price per 100 calories. Products were shortlisted from Amazon bestseller data, independently reviewed supplement databases, and cross-referenced against current third-party testing records from NSF, Informed Sport, and Informed Choice. No product on this list paid to be included. Products were excluded if they used misleading serving size claims without disclosure, contained undisclosed protein spiking, or lacked independent testing verification.

Frequently Asked Questions

Final Thoughts

The best mass gainer is the one you’ll actually use consistently, that contains ingredients you feel good about, and that fits your budget over the long term.

For most people, ON Serious Mass or Dymatize Super Mass Gainer covers everything you need at a price that doesn’t hurt. If ingredient transparency is your priority, Naked Mass is in a different league entirely. If you need extreme calories, Mass-Tech Extreme with milk is unmatched. And if taste is the reason you’ve quit mass gainers before, give BSN True Mass 1200 a real try.

Whatever you choose, remember that the shake is the supplement — the whole food, the training, and the sleep are still the foundation. No tub of powder replaces any of those.

All product specs in this article are verified directly from official manufacturer sources and third-party retailers. Prices are approximate and subject to change. Always read the label before use and consult a qualified healthcare professional if you have any medical conditions.

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