Serious Mass Chocolate 5.4kg
by Optimum Nutrition
Optimum Nutrition Serious Mass is a long-established, high-calorie mass gainer delivering 1,263 kcal, 50g protein, and 251g carbohydrates per 334g serving — one of the largest serving sizes in its category. Best for Hard gainers struggling to consume sufficient calories through whole food alone and People with poor appetite or conditions affecting normal food intake.
According to the AIScored 0–100 scoring system, Serious Mass Chocolate 5.4kg by Optimum Nutrition scores 64.0/100, ranking #18 out of 23 products in Mass Gainers (2026). Strongest category: Effectiveness (73.0/100). Weakest: Certifications (30.0/100).
Is Serious Mass Chocolate 5.4kg worth buying?
“Optimum Nutrition's Serious Mass Chocolate scores 64/100 and delivers 1,263 calories per 334g serving, one of the largest portions you'll find in a mass gainer. Users report genuine weight gain results, and the blend of whey concentrate, casein, and egg protein provides consistent amino acid support throughout the day.”
What Do Reviewers Say About Serious Mass Chocolate 5.4kg?
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 5.4kg score?
Detailed score breakdown and key findings from our analysis of 11 reviews across 2 sources.
Pros
- +Proven track record for actual mass and weight gain, with multiple reviewers reporting visible results
- +High calorie density (1,263 kcal/serving) makes it practical for those struggling to meet caloric goals through food alone
- +Multi-source protein blend (whey concentrate, casein, egg albumen) supports sustained amino acid delivery
- +Comprehensive micronutrient profile covering 20+ vitamins and minerals per serving
- +Large 5.4kg bag offers strong cost-per-calorie value versus smaller competitors
Cons
- -Extremely large 334g serving requires a blender — not shaker-compatible without clumping
- -Maltodextrin is the primary carbohydrate source, producing a high glycaemic response unsuitable for those managing blood sugar
- -Digestive discomfort and bloating reported by some users, particularly from the large carbohydrate load
- -Flavour inconsistency flagged across batches; not third-party tested for label accuracy or contaminants
Best For
Watch Out
- !Bloating and gas are a recurring complaint — starting with half servings is advisable
- !334g serving will not fit most standard shaker bottles; a blender is effectively required
- !Maltodextrin-heavy formula not appropriate for anyone with insulin sensitivity or diabetes
- !Contains milk, egg, gluten, and wheat — unsuitable for those with relevant allergies or intolerances
- !Creatine dose (3g/serving) is slightly below the evidence-based 5g/day maintenance threshold
What is Serious Mass Chocolate 5.4kg?
Serious Mass Chocolate 5.4kg is a mass gainers product by Optimum Nutrition in powder form, scoring 64.0/100 on AIScored.
- • What Is It: A high‑calorie weight gainer that supports muscle building and weight gain, delivering 1,250 calories per serving to help boost calorie intake.
- • Formulated for those who struggle to consume enough food, Serious Mass supplies concentrated macronutrients to assist substantial mass gain.
- • Key Benefits: Formulated to support muscle building and weight gain, supplying concentrated calories and macronutrients for mass accrual.
- • Provides 1,250 calories per serving to help boost daily calorie intake for individuals needing substantial additional energy.
- • Delivers 50 g of protein per serving to help build and maintain muscle as part of an increased‑calorie nutritional plan.
- • Contains over 250 g of carbohydrates per serving to help support muscle recovery and replenish glycogen stores after exercise.
- • Includes 3 g added creatine per serving, included to help support performance.
- • How To Use: Add 334 g (~ 2 heaped scoops) to a blender filled with 710 ml of water and blend for 30–45 seconds until thoroughly mixed.
- • Store in a cool, dry place.
- • Key Ingredients: Key actives per serving: 50 g high protein to help build and maintain muscle, over 250 g carbohydrates to help support muscle recovery and refuel glycogen, plus 3 g added creatine to help support performance.
What's Inside Serious Mass Chocolate 5.4kg?
Serious Mass Chocolate 5.4kg 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 5.4kg 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 5.4kg Compare?
See how this product stacks up against the top-rated mass gainers in our database.
| Product | Score | Price |
|---|---|---|
| Serious Mass Chocolate 5.4kg (this) | 64.0 | £52.95 |
| 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 5.4kg worth buying in 2026? ▼
What is the best price for Serious Mass Chocolate 5.4kg in the UK? ▼
What are the pros and cons of Serious Mass Chocolate 5.4kg? ▼
Is Serious Mass Chocolate 5.4kg third-party tested? ▼
How does Serious Mass Chocolate 5.4kg 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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