Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) vs Serious Mass Cookies & Cream 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 Cookies & Cream 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 Cookies & Cream 2.73kg at 70.0/100. Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) wins on certifications. Serious Mass Cookies & Cream 2.73kg is stronger on effectiveness and value for money.
Which is better: Critical Mass Professional ... or Serious Mass Cookies & Cream 2.73kg?
Applied Nutrition Critical Mass edges ahead with a higher overall score (71 vs 70) and superior ingredient profile, including ISO-XP whey isolate, creatine, and HMB. Choose Optimum Nutrition Serious Mass if you prioritise taste, mixability, and a lower price — it delivers 1,250 kcal per serving at £40 versus £62.76.
— AIScored Editorial Team
How Do the Scores Compare?
Critical Mass Professional ...
Applied Nutrition
|
Serious Mass Cookies & Cream 2.73kg
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
|
30.0/100 |
| 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 Cookies & Cream 2.73kg
Pros
- ✓Excellent taste and mixability (mentioned in 3 of 4 reviews)
- ✓High calorie density (1,250 kcal per serving) supports rapid weight gain for hardgainers
- ✓50g protein per serving aids muscle protein synthesis and recovery
- ✓Added 3g creatine monohydrate per serving (evidence-based for strength and muscle gains)
Cons
- ✗Extremely high sugar content (12g per serving) and 250g carbs may cause energy crashes or GI distress in sensitive individuals
- ✗Not third-party tested or certified (no NSF, Informed-Sport, or banned substance screening listed)
- ✗Contains common allergens (milk, soy, wheat, gluten) limiting accessibility
- ✗Very high serving size (336g per scoop) makes convenient dosing impractical; typically mixed with large volumes of liquid
Best For
What does the data say about Critical Mass Professi... vs Serious Mass Cookies &...?
Both products are calorie-dense mass gainers in powder form, but they differ meaningfully in formulation. Applied Nutrition's Critical Mass (£62.76, 71/100) delivers around 1,000 calories per 150g serving with 42g of ISO-XP whey protein isolate — a higher-quality protein source than the blend typically found in Optimum Nutrition's Serious Mass (£40.00, 70/100), which offers 1,250 calories and 50g protein per 250g serving. Critical Mass also includes creatine monohydrate, HMB, leucine, and glutamine, giving it a more targeted performance profile. Serious Mass keeps things simpler but packs in more raw calories, with 250g of carbohydrates per serving — though that comes with 12g of sugar and a real risk of GI discomfort for sensitive stomachs.
If you're a hardgainer who wants functional extras alongside your calories, Critical Mass is the better pick despite the higher price. If you just need maximum calories quickly and aren't fussed about performance additions, Serious Mass delivers more per serving at a lower cost. Critical Mass users should use a blender — the large serving size clumps badly in a shaker alone.
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 Cookies & Cream 2.73kg? ▼
Is Critical Mass Professional Lean Mass Gainer Vanilla 6kg (40 Servings) worth the price compared to Serious Mass Cookies & Cream 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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