Optimum Nutrition Serious Mass High Protein
Optimum Nutrition Serious Mass is a premium high-calorie gainer designed for users who need a major calorie boost alongside protein.
Editorial review
Product-specific buying guidance
Overview
Optimum Nutrition Serious Mass is a premium high-calorie gainer designed for users who need a major calorie boost alongside protein.
What makes it different
The formula combines 1200+ calories, 50g protein, creatine, glutamine, and vitamins/minerals in a single mass-gainer shake.
Best use case
Best for hard gainers, high-calorie phases, and users who struggle to consume enough food calories.
Limitations
It is not suitable for lean protein needs, cutting phases, or users who want to avoid creatine.
Comparison note
Compared with MuscleBlaze gainers, Serious Mass has stronger global brand recognition and clearer premium gainer positioning.
Final verdict
One of the strongest premium mass gainer picks, but only for users who genuinely need a high-calorie gainer.
Score breakdown
Internal editorial score
This is an internal score out of 10, not an marketplace rating.
- Brand trust
- 9.4/10
- Product relevance
- 8.9/10
- Ingredient/spec clarity
- 8.7/10
- Buyer intent fit
- 8.8/10
- Value expectation
- 8.1/10
- Availability confidence
- 8.8/10
Pros
- 50g protein per serving
- 1200+ calories per 2-scoop serving
- Includes creatine, glutamine, and vitamins/minerals
Cons
- Very high calorie; not for cutting
- Contains creatine, which may duplicate separate creatine use
- Not vegan or dairy-free
Key details
Product details
- Brand
- Optimum Nutrition
- Product type
- High-Calorie Weight Gainer
- Category
- Protein & Muscle Building
- Primary use case
- Users who need a high-calorie weight gainer
- Suitable goals
- muscle gain
- Last updated
- 2026-05-08
Ingredients & Formula
Formula notes
Serious Mass is a calorie-dense gainer and includes creatine; it should not be presented as a lean protein powder.
- Verification status
- verified
- Main ingredients
- Carbohydrate blend, Protein blend, Creatine monohydrate, Vitamins and minerals, Flavor-specific ingredients
- Active ingredients
- Protein blend, Carbohydrates, Creatine monohydrate, Vitamins and minerals
- Protein source
- Dairy-based protein blend; exact protein sources vary by label
- Sweeteners
- Flavor-specific; verify exact label
- Allergen info
- Contains milk/dairy protein. Verify exact label for soy and other allergens.
- Serving info
- 2-scoop serving according to ON Serious Mass positioning.
Nutrition highlights
- 1200+ calories per 2-scoop serving in ON India context
- 50g protein per serving
- Added 3g creatine
- 1g glutamine
- 24 vitamins and minerals on India 3kg page
- Banned substance tested positioning
- Suitable for vegetarians positioning
- Form
- Powder
- Flavor
- Chocolate and other variants
- Package size
- 1kg / 3kg / 5kg and other variants
- Diet tags
- High-calorie, Dairy-based, Not vegan, Contains creatine, Vegetarian positioning
- Certifications
- Banned substance tested positioning
- Protein per serving
- 50g
- Calories per serving
- 1200+ calories per 2-scoop serving
- Carb info
- High-carbohydrate gainer
Best for / avoid if
Best for
- Users who need a high-calorie weight gainer
- Hard gainers looking for a premium gainer brand
- People who want protein plus carbohydrates, creatine, and vitamins/minerals
Avoid if
- You want a lean protein powder
- You are cutting or managing calories
- You already take separate creatine and want to avoid overlap
Medical disclaimer
SupplementCheckLab provides product research and buying guides for informational purposes only. We do not provide medical advice. Always consult a qualified healthcare professional before starting any supplement, especially if you are pregnant, nursing, taking medication, or have a medical condition.
FAQ
Quick buying questions
Is Serious Mass a protein powder or gainer?+
It is a high-calorie weight gainer, not a lean protein powder.
How much protein does it provide?+
ON India lists 50g protein per serving.
Does Serious Mass contain creatine?+
Yes. ON India lists added creatine in Serious Mass.
Who should avoid it?+
Avoid it if you are cutting, managing calories, or do not need a high-calorie shake.
When is it usually used?+
It is typically positioned for between-meal or post-workout calorie surplus use.