Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) vs Serious Mass Chocolate Peanut Butter 2.73kg
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) and Serious Mass Chocolate Peanut Butter 2.73kg.
Last verified: 07 Apr 2026 · Based on 15 reviews
Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) scores 71.0/100 vs Serious Mass Chocolate Peanut Butter 2.73kg at 70.0/100. Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) wins on certifications. Serious Mass Chocolate Peanut Butter 2.73kg is stronger on effectiveness and value for money.
Which is better: Critical Mass Professional ... or Serious Mass Chocolate Pean...?
Optimum Nutrition Serious Mass edges ahead on effectiveness (80 vs 73) and value (80 vs 76) at a lower price. Applied Nutrition Critical Mass suits those who prefer a leaner calorie profile with added HMB and leucine for muscle retention, or who need a larger 6kg supply upfront.
— AIScored Editorial Team
How Do the Scores Compare?
Critical Mass Professional ...
Applied Nutrition
|
Serious Mass Chocolate Pean...
Optimum Nutrition
|
|
|---|---|---|
| Overall Score | 71.0 | 70.0 |
| Effectiveness | 73.0/100 |
80.0/100
Best
|
| Ingredient Quality |
70.0/100
Best
|
70.0/100
Best
|
| Value for Money | 76.0/100 |
80.0/100
Best
|
| Side Effects | 62.0/100 |
70.0/100
Best
|
| Certifications |
72.0/100
Best
|
50.0/100 |
| Best Price | £62.76 Amazon UK → |
£40.00
Holland & Barrett →
Cheapest
|
| Form | Powder | powder |
| Dose | None | None |
| Third-Party Tested | ✗ No | ✗ No |
| Reviews Analysed | 11 | 4 |
Critical Mass Professional Lean ...
Pros
- ✓Over 1,000 calories per serving — highly efficient caloric surplus for hard gainers
- ✓Premium protein source: ISO-XP 95% Whey Protein Isolate at 42g per serving
- ✓Evidence-based performance additions: creatine monohydrate, HMB, leucine, and glutamine
- ✓Reduced-sugar formulation compared to conventional mass gainers
Cons
- ✗Batch-to-batch flavour inconsistency reported — some users find later purchases taste synthetic or chemical
- ✗Large 150g serving size can clump without a blender; shaker alone may not suffice
- ✗Contains milk, soy, and wheat — unsuitable for those with common allergens
- ✗Very high caloric density requires careful tracking to avoid unwanted fat gain
Best For
Serious Mass Chocolate Peanut Bu...
Pros
- ✓Extremely high calorie density (1,263 kcal/serving) designed specifically for muscle gain
- ✓Substantial protein content (50g per serving) with dual whey/casein blend for sustained release
- ✓Added creatine monohydrate (3g/serving) supports strength and performance
- ✓Complete micronutrient profile with 25 vitamins and minerals at therapeutic doses
Cons
- ✗Very high sugar content (26g per serving) unsuitable for those managing blood glucose
- ✗High sodium per serving (1.56g, 26% RDA) may concern sodium-sensitive individuals
- ✗Large serving size (334g powder + 710ml water) makes it inconvenient for on-the-go use
- ✗Contains multiple allergens: milk, soy, wheat, egg; not suitable for allergic individuals
Best For
What does the data say about Critical Mass Professi... vs Serious Mass Chocolate...?
Applied Nutrition's Critical Mass and Optimum Nutrition's Serious Mass are both high-calorie powders aimed at hard gainers, but they differ in a few meaningful ways. Critical Mass delivers around 1,000 kcal per 150g serving alongside 42g of ISO-XP whey protein isolate — a higher-purity form than the blended whey and casein used in Serious Mass. It also includes HMB and leucine, which have decent evidence behind them for muscle retention, particularly during recovery from illness or surgery. Serious Mass counters with a bigger calorie hit — 1,263 kcal per serving — and 50g protein, though that comes with 26g of sugar and 1.56g of sodium per serving, worth noting if you're managing either.
On scores, Critical Mass edges ahead overall at 71.0/100 versus Serious Mass at 70.0/100, though Serious Mass actually scores higher on effectiveness (80 vs 73) and value (80 vs 76). At £40 for 2.73kg versus £62.76 for 6kg, Critical Mass works out cheaper per serving over the long run, though the upfront cost is higher.
For most people just trying to eat in a consistent surplus, Serious Mass is the simpler, cheaper entry point. If you're recovering from illness or injury and want a cleaner protein source with added recovery ingredients, Critical Mass makes more practical sense. Both lack third-party testing, so neither has a certification advantage. The large serving sizes on both mean a blender is genuinely useful — shakers often struggle with powders this dense.
Applied Nutrition Critical Mass Professional is a high-calorie lean mass gainer delivering over 1,000 calories and 42g of protein per 150g serving, built around ISO-XP 95% Whey Protein Isolate with added creatine, HMB, leucine, glutamine, CLA, and MCT powder.
What are the key differences?
Frequently Asked Questions
Which is better, Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) or Serious Mass Chocolate Peanut Butter 2.73kg? ▼
Is Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) worth the price compared to Serious Mass Chocolate Peanut Butter 2.73kg? ▼
Which has fewer side effects? ▼
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Disclaimer: AIScored provides data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.
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