Optimum Nutrition Serious Mass Weight Gainer Vanilla - High Calorie

In this review of Optimum Nutrition Serious Mass Weight Gainer, the bottom line is clear: this is for people who need a high-calorie, high-protein shake to gain size quickly. The reviewer found the formula delivers on its promise of dense calories and recovery support, providing 1,250 calories and 50 grams of protein per two-scoop serving, which makes it a practical choice for athletes, hard gainers and anyone adding mass. The packaging note and heat sensitivity are important practical considerations for buyers receiving a 6 pound tub.

Key Features

• High calorie per serving: Each two-scoop serving supplies about 1,250 calories to help users meet a large daily surplus for weight gain.
• High protein content: The 50 grams of protein per serving supports muscle recovery after workouts and between meals.
• Complete vitamin and mineral blend: The formula includes 25 vitamins and minerals plus creatine and glutamine to support training and recovery.
• Flexible mixability: The powder is instantized and works well in an electric blender with fruits, nut butters or dairy to boost calories and flavor.
• Allergen information: Contains milk, egg, wheat (glutamine peptides) and soy (lecithin), so users with sensitivities should check ingredients before buying.
• Delivery caution: Packaging may vary and the product can be affected by heat or sunlight, so availability at delivery is advised to prevent melting or damage.

Who It's For

The Serious Mass gainer is best for hard gainers, strength athletes and anyone who struggles to reach a calorie surplus through food alone; the dense 1,250 calorie servings make it easy to add significant daily calories in one or two shakes. Individuals focused on muscle-building phases or those with very high energy needs will benefit from the combination of carbs, protein and added creatine and glutamine.

It is not ideal for people who want a low-calorie option, those with dairy, egg, wheat or soy allergies, or users who prefer small, frequent snacks rather than large-volume shakes. Also consider climate and shipping timing due to the product's sensitivity to heat and sunlight.

Pros & Cons

Pros

• Very high calorie density makes achieving a daily surplus straightforward for weight gain.
• Generous 50 g protein per two-scoop serving supports post-workout recovery and muscle support.
• Includes 25 vitamins and minerals plus creatine and glutamine, adding value beyond basic macronutrients.
• Instantized powder blends well in a blender with fruits and nut butters for customized shakes.

Cons

• Contains common allergens (milk, egg, wheat and soy), limiting suitability for some users.
• Product can melt or be damaged if exposed to heat or sunlight during delivery, requiring buyer availability at drop-off.

Specifications

Product type	Weight gainer protein powder
Serving calories	Approximately 1,250 calories per 2 scoop serving
Protein per serving	50 grams
Carbohydrates per serving	Over 250 grams
Added nutrients	25 vitamins and minerals plus creatine and glutamine
Flavor and size	Vanilla, 6 pound tub (packaging may vary)
Allergens	Contains milk, egg, wheat (glutamine peptides) and soy (lecithin)

Our Verdict

Optimum Nutrition Serious Mass is a practical, value-oriented choice for those who must add large amounts of calories and protein to their daily intake to gain weight. The blend of carbs, 50 g protein and added micronutrients makes it useful for focused mass phases, provided buyers can accept the allergen profile and take delivery precautions to avoid heat damage.

Frequently Asked Questions

How many calories are in a serving?
About 1,250 calories per two-scoop serving when mixed as directed, designed for significant daily calorie increase.

Can it be mixed with whole foods?
Yes, the instantized powder blends well in an electric blender with fruits, peanut butter or other calorie-dense add-ins to boost flavor and energy.

Are there allergen concerns?
The product contains milk, egg, wheat (glutamine peptides) and soy (lecithin), so it is not suitable for people with those allergies.