Best Mass Gainer Supplements of 2026

Top Picks for Building Size and Strength

Packing on quality muscle mass isn’t always easy. Even with a structured training program and a calorie-dense diet, many lifters struggle to eat enough food to consistently stay in a caloric surplus. That’s where the best mass gainer supplements can make a real difference.

A quality mass gainer provides a convenient way to increase calorie intake while delivering the protein, carbohydrates, and additional performance ingredients needed to support muscle growth and recovery. However, not every product is created equally. Some are packed with cheap sugars and fillers, while others focus on high-quality ingredients that help fuel lean gains.

Generation Iron reviewed some of today’s most popular mass gainers to determine which products stand out for different goals, whether you’re a hardgainer, competitive bodybuilder, athlete, or simply looking for the best value.

Best Mass Gainer Supplements

• Best Overall: Transparent Labs Mass Gainer
• Best for Bodybuilding: MuscleMeds Carnivor Mass
• Best Tasting: MUTANT MASS
• Best Natural Option: Nutricost Mass Gainer
• Best Budget: Nutricost Mass Gainer

*Note: While categorized here as a vegan-friendly option based on the provided list, Nutricost Mass Gainer contains whey protein concentrate and is not vegan. Those following a strict vegan diet should look for a true plant-based mass gainer.

What Makes a Great Mass Gainer?

The best mass gainers provide much more than calories alone. A quality formula should include:

• High-quality protein for muscle repair and growth
• Complex carbohydrates for sustained energy
• Healthy fats for additional calories
• Minimal added sugars
• Transparent ingredient labeling
• Third-party testing whenever possible
• Digestibility that won’t leave you feeling overly bloated

Rather than relying on maltodextrin and inexpensive fillers, today’s best gainers increasingly use whole-food carbohydrate sources and premium proteins.

Best Overall: Transparent Labs Mass Gainer

Transparent Labs earns our top overall mass gainer recommendation by focusing on ingredient quality instead of simply delivering as many calories as possible.

Each serving provides approximately 760 calories, 53-55 grams of grass-fed whey protein, and more than 100 grams of carbohydrates sourced primarily from oat flour, tapioca, and sweet potato. Unlike many competitors that rely heavily on refined sugars, Transparent Labs uses cleaner carbohydrate sources that promote more sustained energy.

Another standout feature is its commitment to transparency. Every batch undergoes third-party testing, and consumers can review Certificates of Analysis to verify purity and ingredient accuracy.

Additional creatine monohydrate further enhances the formula, helping support increased strength and muscle-building potential during resistance training.

Pros

• Grass-fed whey protein
• Whole-food carbohydrate sources
• Added creatine
• Third-party tested
• No artificial sweeteners, preservatives, or coloring

Cons

• Higher price than budget options
• Lower calorie count than extreme gainers

Best for Bodybuilding: MuscleMeds Carnivor Mass

Competitive bodybuilders often have different nutritional needs than recreational lifters. MuscleMeds Carnivor Mass was designed specifically for maximizing muscle growth during aggressive bulking phases.

Instead of whey, Carnivor Mass utilizes 50 grams of hydrolyzed beef protein isolate, making it an excellent alternative for individuals who struggle with dairy digestion. The formula is lactose-free while still delivering a complete amino acid profile.

The product also supplies 125 grams of carbohydrates alongside over 700 calories, creating an ideal environment for glycogen replenishment and muscle recovery after demanding training sessions.

Its proprietary iSpike carbohydrate technology is designed to support nutrient delivery and muscle anabolism.

Pros

• Hydrolyzed beef protein isolate
• Lactose-free
• High carbohydrate content
• Excellent for serious bulking

Cons

• Premium price
• Beef protein flavor isn’t for everyone

Best Tasting: MUTANT MASS

One of the biggest reasons people stop using mass gainers is taste fatigue. MUTANT MASS continues to earn a loyal following thanks to dessert-inspired flavors that remain enjoyable over weeks of daily use.

Beyond flavor, MUTANT MASS emphasizes real-food ingredients instead of relying entirely on processed carbohydrate powders. The formula provides a balanced blend of protein, carbohydrates, and fats designed to support consistent calorie intake throughout a bulking phase.

The wide variety of flavors—including Chocolate Fudge Brownie, Cookies & Cream, Strawberry Banana, and Vanilla Ice Cream—also makes it easier to avoid flavor burnout.

Pros

• Excellent flavor selection
• Balanced macronutrient profile
• Real-food ingredient focus
• Affordable price

Cons

• Contains artificial flavoring in some varieties
• Not as transparent as premium competitors

Best Natural Mass Gainer: Nutricost Mass Gainer

Although Nutricost Mass Gainer is marketed as an affordable option, it also deserves recognition for its manufacturing standards and overall value.

Each serving supplies:

• 50 grams of protein
• Creatine monohydrate
• L-glutamine
• Third-party testing
• GMP-certified manufacturing

Nutricost focuses on natural transparent labeling and quality control while keeping costs lower than many competitors.

Pros

• Third-party tested
• Includes creatine
• Excellent quality control
• Competitive pricing

Cons

• Fewer servings per container than some competitors

Best Budget Mass Gainer: Nutricost Mass Gainer

For shoppers who prioritize value, Nutricost delivers one of the strongest price-to-performance ratios available.

While premium brands often cost significantly more, Nutricost still includes high-quality ingredients like whey protein concentrate, creatine monohydrate, and glutamine while maintaining third-party testing standards.

If your goal is simply increasing daily calories without spending close to $80 per container, Nutricost offers impressive overall value.

Pros

• Budget-friendly
• Third-party tested
• Includes creatine
• Quality manufacturing

Cons

• Limited servings
• Fewer premium ingredient sources than higher-end products

Do You Actually Need a Mass Gainer?

Not everyone trying to build muscle needs a mass gainer. If you’re able to consume enough calories through whole foods, that should always be your first choice. However, mass gainers become extremely useful for:

• Hardgainers with fast metabolisms
• Athletes burning large numbers of calories
• Bodybuilders during offseason bulks
• Individuals with poor appetites
• Busy professionals who struggle to prepare frequent meals

A shake can easily provide several hundred additional calories in just a few minutes, making it much easier to stay in a calorie surplus consistently.

What Should You Look For?

When choosing the best mass gainer, pay attention to more than calorie count.

Look for products that offer:

• At least 40-50 grams of protein
• Quality carbohydrate sources
• Minimal added sugars
• Third-party testing
• Transparent labels
• Added performance ingredients like creatine
• Protein sources that match your dietary needs

The cheapest product isn’t always the best value if it’s loaded with low-quality fillers.

Final Thoughts

The best mass gainer ultimately depends on your individual goals, digestion, and budget.

No supplement replaces a solid nutrition plan and progressive training program, but the right mass gainer can make reaching your calorie goals significantly easier—helping you maximize muscle growth, improve recovery, and continue making progress in the gym.