10 Best Mass Gainers 2026 in the United States

The NAKED Mass Natural Weight Gainer is a solid choice for those aiming to increase muscle mass and total weight with clean, simple nutrition. Each serving packs a hefty 1,250 calories, which is excellent for serious bulking. It provides 50 grams of protein from a blend of fast-absorbing whey and slow-digesting casein, supporting muscle growth over time. The carbohydrate content is very high at 252 grams per serving, sourced mainly from organic tapioca maltodextrin, a gluten-free and cleaner alternative to typical wheat-based carbs. Fat content is low, which helps keep calories focused on carbs and protein. The product is free of artificial sweeteners, flavors, colors, gluten, soy, and GMOs, appealing to those wanting a natural supplement without additives.

The powder is unflavored, which means you may need to mix it with other ingredients to improve taste and texture. Mixability is generally good since it contains only three ingredients, but blending smoothly might require some effort due to the lack of flavor enhancers. It does not include added digestive enzymes, which could be a consideration for those who prefer them to assist with digestion of large serving sizes.

This mass gainer suits people who prioritize clean, allergen-free ingredients and want a powerful calorie and protein boost without extras. New users of mass gainers might find the unflavored powder less enjoyable, but it offers great flexibility for customized shakes and recipes.

Optimum Nutrition Serious Mass is a high-calorie mass gainer designed to help people who want to gain weight and build muscle. Each serving offers a substantial 1,250 calories, powered by 50 grams of protein mainly from whey, which supports muscle growth. It also provides over 250 grams of carbohydrates, which is good for fueling workouts and replenishing energy. The fat content isn’t specified in detail but is generally balanced for a weight gainer.

One nice touch is the inclusion of 25 vitamins and minerals, plus added creatine and glutamine for muscle recovery and immune support, enhanced by Vitamin C, Zinc, and Vitamin D. This makes it more than just calories – it supports overall health too. The vanilla flavor is a common favorite and tends to mix well, though users might want to blend it with fruits or nuts to boost calorie intake and taste variety.

On the downside, the product contains milk and soy allergens, which could be an issue for some. Also, it’s caffeine-free, so it won’t interfere with sleep or cause jitters. Note that the packaging can vary and the product is sensitive to heat, so customers should be home during delivery to avoid damage. If you are vegetarian and looking for a convenient, nutrient-rich mass gainer with a strong calorie and protein profile, this is a solid choice. However, if you have allergies or want more detailed fat information, you might want to consider those factors before buying.

The NAKED Chocolate Mass Gainer is designed for individuals looking to bulk up and increase their calorie intake efficiently. With a substantial 1,360 calories per serving, it is ideal for those who struggle to consume enough calories through regular meals. The product boasts an impressive 50 grams of protein and 251 grams of carbohydrates per serving, which are essential for muscle growth and recovery. Additionally, it includes 11.6 grams of BCAAs, which support muscle synthesis and reduce fatigue during workouts.

The inclusion of only five natural ingredients—Naked Whey, Naked Casein, Organic Maltodextrin, Organic Coconut Sugar, and Organic Raw Cacao—ensures that the mass gainer is free from artificial sweeteners, flavors, and colors, making it a clean option for health-conscious users. Being gluten-free, soy-free, and GMO-free further adds to its appeal, especially for those with dietary restrictions. The product's versatility in making shakes, smoothies, and various recipes is a bonus for those who like to experiment with their nutrition.

However, some potential drawbacks include the relatively high sugar content (5 grams per serving) and the use of maltodextrin, which may not be ideal for everyone. Additionally, while the flavor and mixability are generally praised, taste preferences can vary. In summary, this mass gainer is a potent option for serious weight gainers who prioritize natural ingredients and high caloric intake.