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If you’re trying to add size and struggling to put on weight, choosing the best weight gainer for skinny guys can make a real difference. The right formula can help you increase daily calories, add protein, and support your bulking routine without making meal planning overly complicated.
When selecting a product from the list, pay close attention to the calorie count per serving, protein amount, carb source, serving size, and how many servings you actually get per container. It also helps to consider whether you want powders, drinks, or pills, plus any preferences for gluten-free, soy-free, lactose-free, or no artificial ingredients.
Let’s get started!
Our Top Picks at a Glance
| Product | Best For | Buy Now |
|---|---|---|
| Dymatize Super Mass Gainer | Very high-calorie mass gaining | Buy |
| Optimum Nutrition Serious Mass | Popular high-calorie weight gain support | Buy |
| GNC AMP Mass XXX | High-calorie, high-protein size gains | Buy |
Best Weight Gainer For Skinny Guys
1. Best Overall: Dymatize Super Mass Gainer
- 52G PROTEIN: Every servings contains 52g of protein to support muscle growth, repair, and recovery. If your goal is gaining muscle size and strenth, then SMG is your perfect workout parther. while recovering from intense workouts and pushing limits in the gym
- CALORIE-DENSE FORMULA: With 1,280 calories per serving, this weight gainer offers a substantial caloric boost for individuals aiming to gain muscle mass and meet their energy needs
- ENHANCED WITH CREATINE AND NUTRIENTS: Each serving provides 1g of creatine to support the increase in power and strength you need to maximize training. Plus 14 essential vitamins and minerals, including Vitamin C, E, and calcium, to support overall health and recovery
Dymatize Super Mass Gainer is built for people who want a high-calorie option in a single serving. With 1,280 calories, 52g protein, and 245g carbs, it stands out as a strong pick for skinny guys who struggle to eat enough throughout the day. It also includes 1g creatine and 10.7g BCAAs, which adds to its appeal for bulking routines.
This formula uses whey protein powder, isolate, and casein, giving it a multi-source protein blend. That can be useful if you want a more complete post-workout or between-meal option. The gourmet vanilla flavor may also appeal if you want something straightforward and familiar.
At 8 servings per container, it is more of a serious bulking product than a casual snack shake. If your main goal is to add a large calorie boost quickly, this is one of the most direct options on the list.
Pros
- 1,280 calories per serving
- 52g protein
- Includes creatine and BCAAs
- Uses whey, isolate, and casein
Cons
- Only 8 servings per container
- Very large calorie serving may not suit everyone
2. Best Popular Pick: Optimum Nutrition Serious Mass
- HIGH CALORIE WEIGHT GAINER: More than 1,200 calories per 2-scoop serving
- 50 grams of blended protein per 2-scoop serving
- Over 250 grams of carbohydrates per 2-scoop serving
Optimum Nutrition Serious Mass is one of the most recognizable weight gainers available. It is designed for people who need a convenient way to raise daily calorie intake and comes in a large 6-pound container. The chocolate flavor and established brand reputation make it a common choice for first-time mass gainer buyers.
This product also includes creatine, vitamin C, and zinc for immune support. That gives it a little more than just calories and protein, making it appealing for users who want a more rounded formula while bulking. It is especially useful for skinny guys who need a shake that fits easily into a daily routine.
Because this is a high-calorie powder, it works best when paired with a structured eating plan. It is a practical option for building a calorie surplus without needing constant extra meals.
Pros
- Well-known and widely used
- Includes creatine
- Has vitamin C and zinc
- Large 6-pound size
Cons
- High calorie serving may be too large for some users
- Packaging may vary
3. Best Clean Formula: NAKED Chocolate Mass Gainer
- ONLY FIVE INGREDIENTS: Naked Whey, Naked Casein, Organic Maltodextrin (made from gluten free organic tapioca), Organic Coconut Sugar, and Organic Raw Cacao. Naked Mass contains no artificial sweeteners, flavors, or colors and is GMO Free, No rBGH or rBST, Soy Free and Gluten Free.
- MAXIMUM NUTRITION: 50g of Protein, 251g of Carbs, 1,360 Calories, 11.6g of BCAAs (branched-chain amino acids) per serving and only 5g sugar - compare vs other weight gain supplements for bulking.
- MULTI-PHASE CLEAN PROTEIN: MULTI-PHASE CLEAN PROTEIN: All natural whey and casein provides your body with healthy amino acids to keep protein synthesis up throughout the day. Combine with a high-calorie diet and exercise to gain weight and transform yourself from a hard gainer to a pro gainer.
NAKED Chocolate Mass Gainer is a straightforward option for users who want a simpler ingredient approach. It offers 1,360 calories in an 8-pound bulk container and is labeled GMO free, gluten free, and soy free. That makes it appealing for skinny guys who want a high-calorie gainer without artificial ingredients.
The all-natural positioning is one of its biggest selling points. If you prefer products that are less flashy and more focused on core nutrition, this formula may fit well. It can be a strong choice for steady weight gain when used consistently.
The chocolate flavor keeps it approachable while still serving as a high-calorie supplement. It is especially appealing to buyers who value ingredient simplicity as much as calorie density.
Pros
- 1,360 calories
- GMO free
- Gluten free
- Soy free
Cons
- Higher price point
- Only one flavor listed
4. Best Heavy-Duty Pick: Mutant Mass Extreme 2500
- "Extreme calorie density for hard gainers: Specially formulated for those with fast metabolisms who struggle to add size, this high calorie protein delivers 1,270 calories per serving to fuel intense muscle building and help you overcome stubborn plateaus."
- "Premium 3-source whey protein blend: Each serving provides 46g of 100% pure whey protein (when mixed with 1% milk) from isolate, concentrate, and hydrolyzed sources to support rapid muscle recovery and repair after intense strength training sessions."
- "Complex carbs from real food sources: Fuel your gains with clean calories sourced from nutrient-dense natural whole foods like sweet potato, barley, and rolled oats. This sustained energy source helps replenish glycogen without the use of unnecessary junk fillers."
Mutant Mass Extreme 2500 is aimed at users who want a dense, high-calorie mass gainer. With 2.2 pounds in the tub and a vanilla ice cream flavor, it is a compact option for anyone looking to add calories and protein to a bulking plan. The product is positioned for muscle building and weight gain.
It highlights clean calories with whole food carbs, which may appeal to buyers who want a more deliberate mass gainer rather than a generic shake. That makes it a practical choice for skinny guys who need extra fuel without overcomplicating their nutrition.
Because the container is smaller than many other options, it may suit users who want to test a mass gainer before committing to a larger size. It gives you a straightforward way to push your calorie intake upward.
Pros
- Designed for muscle building and weight gain
- Highlights whole food carbs
- Vanilla ice cream flavor
- Smaller tub for easier trial use
Cons
- Only 2.2 pounds
- Fewer servings than larger tubs
5. Best Appetite Support Pick: Supragenix CB-1 Weight Gainer Pills
- Proven Weight Gain System: CB-1 Weight Gainer's powerful formula is designed to increase appetite and slow metabolism, helping build real and lasting body mass for both men and women.
- Clinically Tested: Our weight gainer is one of the few weight gain supplements backed by an 8-week clinical test showing users gained more weight on average with CB-1 than with diet alone—highlighting its effectiveness with consistent use.
- Fuller Shape and Curves in Women: Scientifically formulated to support weight gain in areas like hips, thighs, chest, and booty—helping you achieve a curvier figure with a big butt. CB-1 aims to deliver real, lasting results without risky surgery.
Supragenix CB-1 Weight Gainer Pills offer a different approach from the usual powder-based products. Instead of shakes, this bottle provides 90 pills marketed as weight gain support for women and men. It is positioned as a clinically tested appetite booster and mass gainer.
This format may appeal to users who don’t want to deal with mixing powders or large shakes. For skinny guys who prefer a supplement in capsule form, it offers a simple way to add another support product to their routine.
Since it is not a calorie-dense shake, it works differently than the other products on this list. It is best viewed as a support option rather than a direct replacement for a full mass gainer powder.
Pros
- Capsule format instead of powder
- Marketed for men and women
- Clinically tested appetite booster claim
- Easy to take on the go
Cons
- Not a calorie shake
- May not suit buyers who want direct calorie intake
6. Best Ready-to-Drink Pick: BOOST Very High Calorie Drink
- Convenient Weight Gain Support: BOOST Very High Calorie Nutritional Drink provides a high calorie, high protein, nutrient-packed snack or mini meal, helping you to gain weight or maintain weight
- 530 Nutrient-Dense Calories: Each 8 fl oz of this nutritional drink provides 530 calories, with 22 g of high-quality protein to help maintain muscles
- 26 Vitamins & Minerals: This calorie-dense nutritional drink provides key nutrients for immune support, including vitamins C, zinc and iron, brain health, including vitamin B12 and niacin, and bone health, including calcium and vitamin
BOOST Very High Calorie Nutritional Drink is a convenient ready-to-drink option for people who want calories without mixing powder. Each 8 fl oz bottle delivers 530 calories, 22g protein, and 26 vitamins and minerals. It is designed to help with weight gain and maintenance.
This is a useful choice if you want something portable and easy to consume. Skinny guys who need extra calories on busy days may appreciate the simplicity of grabbing a bottle instead of preparing a shake.
The pack of 24 makes it practical for users who plan to use it regularly. It may be less intense than a large mass gainer powder, but it offers convenience and consistency.
Pros
- Ready-to-drink convenience
- 530 calories per bottle
- 22g protein
- Includes 26 vitamins and minerals
Cons
- Less calorie-dense than powder gainers
- Chocolate flavor only
7. Best Clean Ingredients: RIVAL NUTRITION Clean Gainer
- Clean Formulation/Natural Flavors: Naturally flavored. Sweetened with stevia leaf extract. Gluten free. No added sugars, artificial colors/dyes, or fillers.
- Quality Calories: 580 calories per serving to assist lean gains, help fuel energy intense activity, and aid muscle recover & glycogen replenishment after workouts, competitions, or other exercise
- Premium Proteins: 30g protein per serving from a combination of whey, milk, and micellar casein sources. Proteins provide naturally occurring branched chain amino acids (BCAAs) and other essential amino acids (EAAs).
RIVAL NUTRITION Clean Gainer is a high-protein lean gainer designed for people who want a more controlled mass-building formula. It provides 580 calories, 30g protein, and 101g multi-source carbs per serving. The product also emphasizes natural flavors and clean ingredients.
This can be a smart fit for skinny guys who want to gain weight without jumping straight into the biggest calorie bombs available. It gives a balanced middle ground between calorie support and protein intake.
The 5-pound size and 15 servings make it a good option for people who want to manage portions carefully. It is especially suited for lean gain goals rather than extreme bulking.
Pros
- Clean ingredients focus
- 580 calories per serving
- 30g protein
- Natural flavors
Cons
- Only 15 servings
- Lower calorie count than extreme mass gainers
8. Best Premium Gainer: Optimum Nutrition GS Pro Gainer
- Vitamin C and Zinc Provides Immune Support along with Vitamin E
- 650 CALORIES - delivering calories that count to support your gains
- 60G PROTEIN BLEND - support your mass gaining goals with high-quality protein
Optimum Nutrition GS Pro Gainer is a premium weight gainer powder with a double chocolate flavor and a 5.09-pound package. It is built for users who want a recognized brand and a more refined mass gainer option. Its positioning makes it appealing for serious weight gain support.
The product is part of Optimum Nutrition’s established lineup, which may matter to buyers who prefer a trusted supplement brand. For skinny guys looking to build size with a premium formula, this is a strong contender.
Because it is a gainer powder rather than a meal replacement, it works best as part of a wider eating plan. It can be especially useful around workouts or as an added calorie boost between meals.
Pros
- Premium brand option
- Double chocolate flavor
- Good for serious weight gain plans
- Compact 5.09-pound size
Cons
- Higher price
- Packaging may vary
9. Best Vanilla Option: Optimum Nutrition Gold Standard Pro Gainer
- High Protein Weight Gainer and Muscle Mass Gainer*
- 650 CALORIES PER SERVING - delivering calories that count to support your gains
- 60G OF PROTEIN BLEND PER SERVING- support your mass gaining goals with high-quality protein
Optimum Nutrition Gold Standard Pro Gainer comes in Vanilla Custard and shares the same premium positioning as the brand’s GS line. It is a weight gainer protein powder in a 5.09-pound container, making it a tidy option for buyers who want a classic vanilla-style shake.
This formula is a good fit for skinny guys who want an easier-tasting gainer with a familiar profile. Vanilla flavors often work well if you like mixing shakes with other ingredients or prefer a lighter taste.
Its premium positioning, combined with the Gold Standard name, makes it a dependable option for regular bulking use. It works well for users who want a high-quality supplement with a less intense flavor profile.
Pros
- Vanilla Custard flavor
- Premium Gold Standard line
- 5.09-pound container
- Good for regular bulking use
Cons
- Higher price
- Packaging may vary
10. Best Dairy-Free Friendly Pick: MuscleMeds CARNIVOR Mass Gainer
- High-Speed Macronutrient Delivery: Proteins and carbohydrates that are absorbed at high speeds can help spike your blood amino acid and glucose levels. In turn, this stimulates the potential for higher speeds of protein and glycogen synthesis (anabolism), which can result in faster gains in muscle mass.
- Properly-Timed Insulin Optimization: Insulin is a powerful muscle growth and recovery hormone, so much so that pro bodybuilders and athletes seek to increase their natural product and proclaim amazingly fast gains. Yes, insulin is that anabolic and effectively triggers muscle growth, especially in combination with a fast acting protein. Read on to discover how CARNIVOR MASS can help you reap insulin’s extreme muscle building effects.
- 350% more concentrated in amino acids than steak and more concentrated than whey, with no fat or cholesterol, and without gelatin or collagen. Plus, CARNIVOR MASS is further enhanced with BCAAs for additional anabolic power.
MuscleMeds CARNIVOR Mass Gainer uses beef protein isolate and is lactose free, which sets it apart from most traditional mass gainers. It delivers 50g protein, 125g carbs, 0 fat, and 0 sugar, all in a chocolate peanut butter flavor. It is also halal certified.
This can be a smart choice for skinny guys who want a non-dairy gainer option. The protein source and formula may appeal to buyers who avoid lactose or simply want something different from standard whey-based products.
Because it is calorie and carb focused, it still fits the core purpose of weight gain. The zero fat and zero sugar profile may also interest users who want a more specific macro profile.
Pros
- Lactose free
- 50g protein
- 125g carbs
- Halal certified
Cons
- May not suit buyers who want whey-based protein
- Smaller than some larger mass gainers
11. Best Strength Support Pick: GNC AMP Mass XXX
- Clinically Proven Gainer: Mass XXX mass gainer combines high-quality protein powder, key nutrients, and science-backed innovations—including MyoTOR, creatine, and BETAPOWER—to fuel proven results and performance
- Increase Mass with 40% Fewer Sets: Delivers 50g of protein, including naturally occurring EAAs, plus carbs, and healthy fats—and it’s clinically proven to help get better results out of workouts
- Improve Muscle Strength in As Early as 2 Weeks: MyoTOR is clinically proven to accelerate improvements in strength with as little as 2 weeks of training and included in every serving of Mass XXX mass gainer
GNC AMP Mass XXX is a clinically proven weight gainer powder that focuses on improving strength and size. It delivers 780 calories, 50g protein, micronized amino acids, creatine, and betaine in a vanilla formula. The product comes in a 6-pound container with 13 servings.
This is a strong option for skinny guys who want a more performance-oriented mass gainer. The inclusion of creatine and betaine makes it appealing to users who are pairing weight gain with training goals.
With its higher-end positioning and calorie content, it suits serious lifters looking for a concentrated supplement. It may be especially attractive if you want a formula that blends size support with workout-focused ingredients.
Pros
- 780 calories
- 50g protein
- Includes creatine and betaine
- Clinically proven positioning
Cons
- Only 13 servings
- Higher price
12. Best High-Calorie Classic: MHP UYM XXXL 1350 Mass Building Weight Gainer
- ✓ 1350 Nutrient Dense Calories
- ✓ Powerful Gains in Hard, Dense Muscle Mass
- ✓ Optimizes Insulin Response for Maximum Muscle Growth
MHP UYM XXXL 1350 Mass Building Weight Gainer is built for people who want a high-calorie bulk product with solid protein support. It offers 50g protein, high calories, 11g BCAAs, and leucine in a French Vanilla Creme flavor. The container provides 8 servings.
This type of formula can be a good fit for skinny guys who need a serious calorie bump and want a product designed specifically for muscle mass gains. The inclusion of BCAAs and leucine also supports its training-focused positioning.
Because it is a concentrated mass gainer, it may work best when your goal is to push calories up aggressively. It is a straightforward choice for turning around a hard-gainer diet.
Pros
- 50g protein
- 11g BCAAs
- Includes leucine
- High-calorie mass building formula
Cons
- Only 8 servings
- Higher price per container
13. Best Lean Muscle Pick: PEScience Smart Mass Gainer
- Clean Mass Gainer in Convenient Packets – No more tubs, scoops, and guesswork. Smart Mass delivers a clean, convenient way to bulk using 14 pre-portioned packets, each with 225 calories, 25g protein and 25g carbs. In a rush? Smart Mass also makes for a perfect on-the-go meal replacement.
- Premium Protein Powder Blend: Whey + Casein – Each serving delivers 25g of complete protein using a blend of fast-absorbing whey and slow-digesting casein. Supports sustained amino acid release for post-workout, between meals, or before bed.
- Slow-Digesting Carbs for Lean Gains – Unlike typical gainers loaded with cheap sugar and maltodextrin, Smart Mass uses slow-burning carbs from pea starch (Carb10), Palatinose (isomaltulose), and oat bran. This cleaner carb profile helps support steady energy release without the crash, making it ideal for lean bulking.
PEScience Smart Mass Gainer is a packet-based lean muscle weight gainer that blends whey protein and casein protein with slow-digesting carbs. It is maltodextrin-free and comes in a gourmet chocolate flavor. The package includes 14 packets for easy portioning.
This product is a strong option for skinny guys who want controlled servings instead of a huge tub. The packet format makes it easy to use on the go or to keep calories more consistent from day to day.
Its lean-gainer positioning may be especially appealing if you want to add weight without relying on a very heavy mass gainer formula. It is a practical option for structured bulking.
Pros
- Packet format for convenience
- Whey and casein protein blend
- Maltodextrin-free
- Slow-digesting carbs
Cons
- Only 14 packets
- May not be as calorie-heavy as larger gainers
14. Best Budget-Friendly Pick: Rule 1 Proteins Clean Gainer
- Rule One Protein's Lean Gainer Formula: 560 quality calories from premium proteins, fast-fueling carbohydrates, and energy-packed lipids to help you add incremental size and strength.
- Quality Carbs: Over 90g of readily digested simple and complex carbs from multiple sources to help training energy and post-workout glycogen recovery.
- Full-Spectrum Protein: 30g of protein from whey, milk isolate, and micellar casein supply vital amino acids.
Rule 1 Proteins Clean Gainer gives users a lean gain formula with 560 calories, 30g of full-spectrum protein, and over 90g carbs per serving. It also keeps fat under 6g, which makes it attractive to buyers who want to add calories without going overboard. The chocolate fudge flavor comes in a 15-serving container.
This is a solid balance option for skinny guys who want a cleaner mass gainer that still delivers enough energy to support bulking. It sits in a middle zone between extreme calorie products and lighter supplements.
The formula is simple enough for regular use, and the calorie count is still strong enough to support a weight gain plan. It is a practical choice for controlled size-building.
Pros
- 560 calories per serving
- 30g full-spectrum protein
- Over 90g carbs
- Under 6g fat
Cons
- Only 15 servings
- Not the highest-calorie option
15. Best Large-Container Pick: Gaspari Nutrition Real Mass
- 100% COMPLEX CARB BLEND: Containing ultra-low insulinemic Pea Starch carbohydrate, Rolled Oats and Quinoa ensuring a lower and more sustained release of glucose.
- ULTRA-PREMIUM PROTEIN MATRIX: Containing Whey Protein Isolate, Milk Protein Isolate, and Whey Hydrolysates. Plus MCTs and natural flax-seed oil to help increase your body’s metabolic activity.
- PROVEN RATIO: Each serving provides a scientifically proven 5:1 Carbohydrate to Protein ratio. This validated ratio gives users all of the calories & protein needed to maximize results.
Gaspari Nutrition Real Mass is an advanced weight gainer with a large 12-pound container. It provides 50g protein and 16g EAAs in a chocolate ice cream flavor, making it one of the larger bulk options in this list. It is designed around protein and complex carb support.
This product is especially useful for skinny guys who want a long-lasting supply rather than a smaller trial-sized container. The high tub size makes it a strong pick for consistent bulking over time.
Its gluten-free positioning adds another useful detail for buyers who care about ingredient compatibility. If you want a big container and a straightforward mass gaining formula, this is a dependable option.
Pros
- Large 12-pound container
- 50g protein
- 16g EAAs
- Gluten-free
Cons
- Higher price
- Large container may be more than some buyers need
Buying Guide
Choosing the right mass gainer depends on your appetite, training schedule, and how many extra calories you need each day. A good product should make it easier to maintain a calorie surplus without being so heavy or inconvenient that you stop using it. Below are the main things to consider before buying.
Calories Per Serving
Calories are the foundation of any weight gain product. If you are very underweight or struggle to eat enough food, a higher-calorie formula may work best. If you want more controlled progress, a moderate calorie gainer may be easier to use consistently.
Protein Content
Protein helps support muscle-building goals while you gain weight. Look for a product that gives you enough protein to complement your meals and training. Higher protein is often useful, but the best amount depends on the rest of your diet.
Carbohydrate Source
Carbs are a major reason mass gainers can be so effective for skinny guys. They help drive calorie intake upward and can support training energy. Some products use multi-source carbs, while others focus on cleaner or slower-digesting carb blends.
Ingredients and Sensitivities
If you avoid gluten, soy, lactose, or artificial ingredients, make sure the product matches your needs. This can make a big difference in whether you can use the gainer consistently. Always choose a formula you can tolerate regularly.
Serving Size and Convenience
Large servings can be effective, but they may also feel too filling. If you need something easier to manage, a lower-serving or packet-based product may be more realistic. Ready-to-drink options can also be useful when you are short on time.
Value for Money
Look at the serving count, not just the tub size or sticker price. A cheaper container is not always better if it runs out quickly. Comparing cost per serving is one of the simplest ways to find real value.
Frequently Asked Questions
What is the best weight gainer for skinny guys?
The best choice depends on your calorie needs and how easy the product is for you to use regularly. High-calorie powders like Dymatize Super Mass Gainer and Optimum Nutrition Serious Mass are strong options for many hard gainers.
Should skinny guys use mass gainers every day?
Many people use mass gainers daily when they need help reaching their calorie goals. The key is to use them as part of a full eating plan instead of relying on them alone.
Are high-calorie gainers better than lean gainers?
Not always. High-calorie gainers can help if you struggle to eat enough, while lean gainers may be better if you want a more controlled approach. The best option depends on your appetite and training plan.
Can a weight gainer replace meals?
It can help supplement meals, but it should not fully replace balanced food in most cases. Whole meals still provide nutrients, fiber, and variety that powders or drinks may not fully cover.
Are ready-to-drink gainers effective?
Yes, they can be effective if convenience matters most. They may provide fewer calories than large powder servings, but they are easy to use and can help keep your intake consistent.
How do I know if a gainer is working?
Track your body weight, strength, and monthly progress. If your weight is not increasing after a few weeks, you may need a product with more calories or a larger daily serving.
Conclusion
The Best Weight Gainer For Skinny Guys is the one that fits your calorie needs, digestion, and daily routine. If you want massive calorie support, stronger formulas like Dymatize Super Mass Gainer and Optimum Nutrition Serious Mass are excellent places to start. If you prefer cleaner ingredients or a different format, there are also great options in this list for every type of hard gainer.
Choose a product you can use consistently, pair it with solid meals and training, and stay patient with your progress. Over time, the right mass gainer can make bulking simpler and more manageable.