Serious Mass Powder Banana 5.4kg
by Optimum Nutrition
Optimum Nutrition Serious Mass is one of the most established mass gainers on the market, delivering approximately 1,250 calories, 50g protein, and 250g carbohydrates per massive ~334g serving — making it a go-to for hardgainers needing a significant caloric surplus. Best for Hardgainers with fast metabolisms who struggle to consume enough calories from whole foods and Athletes in a dedicated bulking phase requiring a large daily caloric surplus.
According to the AIScored 0–100 scoring system, Serious Mass Powder Banana 5.4kg by Optimum Nutrition scores 66.0/100, ranking #16 out of 23 products in Mass Gainers (2026). Strongest category: Effectiveness (76.0/100). Weakest: Certifications (28.0/100).
Is Serious Mass Powder Banana 5.4kg worth buying?
“If you're a hardgainer struggling to eat enough, Optimum Nutrition's Serious Mass delivers 1,250 calories and 50g protein per serving, plus creatine monohydrate to support muscle growth. It's proven itself over more than a decade with a loyal following, though its 66/100 score indicates there are stronger options available if you're chasing maximum gains.”
What Do Reviewers Say About Serious Mass Powder Banana 5.4kg?
Sample excerpts from currently available source material used in this product analysis.
"One word says it all "Marvellous". First class, does exactly what is stipulated on container, I find the 5.4kgs sufficient for all the nutrients one needs to stay well and if needed for a controlled modern lifestyle, I am 71 yrs old and fin..."
"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..."
How does Serious Mass Powder Banana 5.4kg score?
Detailed score breakdown and key findings from our analysis of 12 reviews across 2 sources.
Pros
- +Extremely high calorie density (~1,250 kcal/serving) — effective for hardgainers and those with small appetites who struggle to hit caloric targets
- +50g protein per serving plus 3g creatine monohydrate — covers both muscle-building macros in one product
- +Long-standing brand reputation; strong loyalty among long-term users, some using it for over 10 years
- +Banana flavour generally well-rated; palatable for a very high-calorie powder
- +Comprehensive added vitamin and mineral complex provides meaningful micronutrient support
Cons
- -Maltodextrin is the dominant carbohydrate source — high glycaemic index, not suitable for lean bulk or blood sugar management
- -Not third-party tested (no Informed Sport, NSF, or equivalent certification)
- -Requires a blender for proper mixing; clumping reported in standard shakers due to the enormous serving size
- -Occasional batch inconsistency reported — flavour significantly off in some deliveries
Best For
Watch Out
- !High maltodextrin content causes rapid blood sugar spikes — unsuitable for those with diabetes or insulin sensitivity
- !Serving size is very large (~334g powder); a standard shaker will not mix it effectively — a blender is required
- !Contains carrageenan (a stabiliser associated with gut inflammation in sensitive individuals)
- !Multiple major allergens present: milk, whey, soy lecithin, gluten — may contain eggs and peanuts
- !Creatine dose (3g) is slightly below the clinically studied 5g/day threshold for performance benefits
What is Serious Mass Powder Banana 5.4kg?
Serious Mass Powder Banana 5.4kg is a mass gainers product by Optimum Nutrition in powder form, scoring 66.0/100 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 Powder Banana 5.4kg?
Serious Mass Powder Banana 5.4kg contains 36 active ingredients: Per, Fat, of which saturates, Carbohydrates and more.
Active Ingredients
- Per
- 100g / Per 30g Serving : Energy 1574kJ / 5273kJ / 376kcal / 1260kcal
- Fat
- 1.9g / 6.3g
- of which saturates
- 1.0g / 3.5g
- Carbohydrates
- 75g / 250g
- of which sugars
- 3.7g / 12g
- Protein
- 15g / 50g
- Salt
- 0.44g / 1.48g
- Vitamin E
- 2.7 mg / 9.0 mg
- Vitamin C
- 19 mg / 63 mg
- Thiamin
- 0.27 mg / 0.90 mg
- Riboflavin
- 0.34 mg / 1.1 mg
- Niacin
- 4.0 mg / 13 mg
- Pantothenic Acid
- 1.3 mg / 4.5 mg
- Calcium
- 230 mg / 770 mg
- Phosphorus
- 160 mg / 536 mg
- Magnesium
- 0.60 mg / 2.0 mg
- Iron
- 4.2 mg / 14 mg
- Zinc
- 3.0 mg / 10 mg
- Copper
- 0.30 mg / 1.0 mg
- Manganese
- 0.60 mg / 2.0 mg
- Fluoride
- 0.87 mg / 2.9 mg
- Creatine
- 0.9 g / 3.0 g Macro Nutrient table: Energy Kcal per 100g 376Kcal
- Energy kJ per
- 100g 1574kJ
- Fats per
- 100g 1.9g
- Of which Saturates per
- 100g 1g
- Carbohydrates per
- 100g 75g
- Sugar per
- 100g 3.7g
- Protein per
- 100g 15g
- Salt per
- 100g 0.44g
- Fats per serving
- 6.3g
- Of which Saturates per serving
- 3.5g
- Carbohydrates per serving
- 250g
- Sugar per serving
- 12g
- Protein per serving
- 50g
- Salt per serving
- 1.48g
- Serving size
- 30g
Other Ingredients
Corn, Maltodextrin, WHEY Protein Concentrate [MILK] (Emilsifier: Lecithin [SOY]), Flavourings [MILK], Creatine Monohydrate, MILK Mineral Complex, Minerals (Magnesium, Iron, Zinc, Manganese, Fluoride, Selenium, Iodine, Copper, Molybdenum, Chromium), Salt, Vitamins (C, E, B3, A, B5, B7, B12, B9, D, B6, B1, K, B2), Stabilisers (Cellulose Gum, Guar Gum, Carrageenan), Sweetener (Sucralose), Colour (Riboflavins). For Allergens - See ingredients in bold. May contain nuts and peanuts.May
Is Serious Mass Powder Banana 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 Powder Banana 5.4kg Compare?
See how this product stacks up against the top-rated mass gainers in our database.
| Product | Score | Price |
|---|---|---|
| Serious Mass Powder Banana 5.4kg (this) | 66.0 | £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 Powder Banana 5.4kg worth buying in 2026? ▼
What is the best price for Serious Mass Powder Banana 5.4kg in the UK? ▼
What are the pros and cons of Serious Mass Powder Banana 5.4kg? ▼
Is Serious Mass Powder Banana 5.4kg third-party tested? ▼
How does Serious Mass Powder Banana 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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