Serious Mass Chocolate 2.73kg
by Optimum Nutrition
Optimum Nutrition Serious Mass is a long-established, high-calorie mass gainer delivering 1,250 calories and 50g protein per 334g serving, primarily via maltodextrin, whey concentrate, casein, and egg albumen, with added creatine monohydrate and a broad vitamin-mineral complex. Best for Hard gainers and ectomorphs struggling to meet caloric targets through food alone and People with low appetite or medical conditions limiting solid food intake.
According to the AIScored 0–100 scoring system, Serious Mass Chocolate 2.73kg by Optimum Nutrition scores 68.0/100, ranking #14 out of 23 products in Mass Gainers (2026). Strongest category: Effectiveness (78.0/100). Weakest: Certifications (35.0/100).
Is Serious Mass Chocolate 2.73kg worth buying?
“If you're a hard gainer who needs calories, Serious Mass gives you 1,250 per serving with 50g of protein and creatine monohydrate—helpful if you can't stomach enough whole food. At 68/100, it's reliable and straightforward, but you're basically drinking liquid carbs so factor that into your daily macros.”
What Do Reviewers Say About Serious Mass Chocolate 2.73kg?
Sample excerpts from currently available source material used in this product analysis.
"Have this product on subscribe and save so only recently opened my most recent delivery, and there is next to no flavour, never had this issue before, but with this bag it taste horrible"
"I only use this brand of mass gainer… reason being it sits will in my digestive system, it definitely does what it supposed to do. I have used other brands, cheaper brands but they do not pack the punch this do 💪 I have literally been buyin..."
"It's helping me put on weight. I added a tablespoon of peanut butter and a banana, tastes really good with the strawberry one. This seems to be the best mass gainer, I've looked around and this is always said to be the best with approved in..."
"I don’t use this protein for the gym I use it cos I struggle to eat normal food and so this sometimes becomes my only source of food and with 1250 calories per shake I know if I drink 2 a day I’ll get all the nutrients I need infact probabl..."
"This protein powder is an excellent for anyone serious about gaining mass. The large size offers fantastic value, and the mix is effective and potent. It mixes well, taste good and is essential for hitting those high-calorie and high-protei..."
How does Serious Mass Chocolate 2.73kg score?
Detailed score breakdown and key findings from our analysis of 11 reviews across 2 sources.
Pros
- +Extremely high calorie density (1,250 kcal/serving) — effective for hard gainers and those with poor appetite
- +50g complete protein per serving from multiple sources (whey concentrate, casein, egg albumen)
- +Includes 3g creatine monohydrate per serving — added performance and muscle benefit
- +Comprehensive vitamin and mineral profile covering most micronutrient needs
- +Strong brand reputation with consistent quality across decades; Optimum Nutrition is widely regarded as a gold standard
Cons
- -Maltodextrin is the dominant carbohydrate source — fast-digesting, high glycaemic, with limited nutritional value beyond calories
- -334g serving size is impractical for standard shaker bottles and requires a blender for best results
- -Reported digestive discomfort and bloating in a subset of users, likely due to serving volume and maltodextrin load
- -Not third-party tested; no Informed Sport certification noted on this SKU
Best For
Watch Out
- !Very high per-serving sugar (26g) and maltodextrin content — unsuitable for those managing blood sugar or insulin sensitivity
- !Significant allergen load: contains milk, egg, gluten/wheat; may contain peanuts and soy
- !Batch flavour inconsistency reported by at least one subscriber — flavour quality not always uniform
- !Calorie surplus can lead to fat gain if training volume and intensity are insufficient to utilise the extra calories
What is Serious Mass Chocolate 2.73kg?
Serious Mass Chocolate 2.73kg is a mass gainers product by Optimum Nutrition in powder form, scoring 68.0/100 on AIScored.
- • SUPPORTS MUSCLE BUILDING & WEIGHT GAIN1,250 CALORIES* – HELPS BOOST CALORIE INTAKE50 g▲ SOURCE OF PROTEIN – HELPS BUILD AND MAINTAIN MUSCLE▪Serious weight gain requires serious calories.
- • However, those who need the extra calories most often have the toughest time consuming enough of them.
- • For many aspiring to be bigger, a highly active metabolism, weaker appetite and on-the-run lifestyle can make it a real challenge to consume enough calories through whole foods alone.
- • Serious Mass is the ultimate in weight gain formulas.With 1,250 calories per serving to boost daily calorie intake, 50g high protein to support muscle growth and repair, over 250g carbohydrates helping support muscle recovery , and now with 3g added Creatine to support performance per serving, you’ve got nothing to lose and lots to gain.
- • It is time to stop thinking small and get serious – SERIOUS MASS®.
What's Inside Serious Mass Chocolate 2.73kg?
Serious Mass Chocolate 2.73kg contains 43 active ingredients: Per, Fat, of which saturates, Carbohydrates and more.
Active Ingredients
- Per
- 100g / Per 334g Serving : Energy 1582kJ / 5284kJ / 378kcal / 1263kcal
- Fat
- 1.7g / 5.5g
- of which saturates
- 0.7g / 2.4g
- Carbohydrates
- 75g / 251g
- of which sugars
- 7.7g / 26g
- Protein
- 15g / 50g
- Salt
- 0.47g / 1.56g
- Vitamin D
- 1.2µg / 4.0µg
- Vitamin E
- 2.7mg / 9.0mg
- Vitamin K
- 22µg / 75µg
- Vitamin C
- 19mg / 64mg
- Thiamin
- 0.27mg / 0.89mg
- Riboflavin
- 0.34mg / 1.1mg
- Niacin
- 3.9mg / 13mg
- Folic Acid
- 45.1µg / 151µg
- Biotin
- 11µg / 37µg
- Pantothenic Acid
- 1.4mg / 4.5mg
- Calcium
- 180mg / 600mg
- Phosphorus
- 159mg / 532mg
- Magnesium
- 85.8mg / 287mg
- Iron
- 5.4mg / 18mg
- Zinc
- 3.2mg / 11mg
- Copper
- 0.41mg / 1.4mg
- Manganese
- 0.60mg / 2.0mg
- Fluoride
- 1.0mg / 3.5mg
- Selenium
- 17µg / 55µg
- Chromium
- 14µg / 46µg
- Molybdenum
- 17µg / 57µg
- Creatine
- 0.9g / 3.0g Macro Nutrient table: Energy Kcal per 100g 378Kcal
- Energy kJ per
- 100g 1582kJ
- Fats per
- 100g 1.7g
- Of which Saturates per
- 100g 0.7g
- Carbohydrates per
- 100g 75g
- Sugar per
- 100g 7.7g
- Protein per
- 100g 15g
- Salt per
- 100g 0.47g
- Fats per serving
- 5.5g
- Of which Saturates per serving
- 2.4g
- Carbohydrates per serving
- 251g
- Sugar per serving
- 26g
- Protein per serving
- 50g
- Salt per serving
- 1.56g
- Serving size
- 334g
Other Ingredients
Maltodextrin, WHEY Protein Concentrate [MILK], Calcium CASEINATE [MILK], Fat-Reduced Cocoa Powder, Creatine Monohydrate, Flavouring, MILK Mineral Complex, Medium Chain Triglycerides [MILK], EGG Albumen, Sodium Chloride, Dipotassium Phosphate, Vitamin & Mineral Blend (Sodium L-Ascorbate, Ferric Pyrophosphate, D-Alpha-Tocopheryl Acetate, Nicotinamide, Zinc Oxide, Retinyl Acetate, Calcium D-Pantothenate, Sodium Fluoride, Manganese Sulphate, Potassium Iodate, Cyanocobalamin, D-Biotin,
Is Serious Mass Chocolate 2.73kg Independently Tested?
No Third-Party Testing Visible
We could not find evidence of independent third-party testing for this product. This doesn't mean it's unsafe, but independent verification provides additional assurance.
How We Score Supplements
Our methodology analyses review data, ingredient science, and product information, then scores each product on a 0-100 scale across evidence-based categories:
Effectiveness
How well the product delivers its claimed benefits, based on reviews and ingredient evidence.
Ingredient Quality
Bioavailable forms, clinically effective dosages, clean label, minimal fillers.
Value for Money
Price relative to ingredient quality, dosage count, and effectiveness.
Side Effects Profile
Higher score = fewer side effects. 100 means virtually no adverse reactions reported.
Certifications & Testing
Third-party lab testing, GMP certification, and independent quality verification.
Overall Score
Weighted combination of all factors. Our bottom-line recommendation.
How Does Serious Mass Chocolate 2.73kg Compare?
See how this product stacks up against the top-rated mass gainers in our database.
| Product | Score | Price |
|---|---|---|
| Serious Mass Chocolate 2.73kg (this) | 68.0 | £40.00 |
| Critical Mass Professional Lean ... | 80.0 | £40.00 |
Price History (90 days)
Quick Facts
- Form
- powder
- Serving
- 1 serving
- Vegan
- No
Frequently Asked Questions
Is Serious Mass Chocolate 2.73kg worth buying in 2026? ▼
What is the best price for Serious Mass Chocolate 2.73kg in the UK? ▼
What are the pros and cons of Serious Mass Chocolate 2.73kg? ▼
Is Serious Mass Chocolate 2.73kg third-party tested? ▼
How does Serious Mass Chocolate 2.73kg compare to Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings)? ▼
Disclaimer: AIScored provides research-backed summaries based on publicly available reviews and product information. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Affiliate links may earn us a commission at no extra cost to you.
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