Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) vs Serious Mass Cookies & Cream 5.4kg

Side-by-side comparison of scores, ingredients, prices and real customer feedback for Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) and Serious Mass Cookies & Cream 5.4kg.

Last verified: 07 Apr 2026 · Based on 8 reviews

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80.0

Quick Answer

Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) scores 80.0/100 vs Serious Mass Cookies & Cream 5.4kg at 70.0/100. Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) wins on effectiveness, ingredient quality, side effects.

Which is better: Critical Mass Professional ... or Serious Mass Cookies & Cream 5.4kg?

Applied Nutrition Critical Mass wins with an 80/100 score versus Optimum Nutrition's 70/100, and costs £18 less for a comparable supply. Its higher ingredient quality score and faster-reported results make it the better pick for most hard gainers. Choose Serious Mass if you want added creatine and prefer a larger 5.4kg tub to reduce reorder frequency.

— AIScored Editorial Team

How Do the Scores Compare?

Critical Mass Professional ...

Serious Mass Cookies & Cream 5.4kg

	Critical Mass Professional ... Applied Nutrition	Serious Mass Cookies & Cream 5.4kg Optimum Nutrition
Overall Score	80.0	70.0
Effectiveness	90.0/100 Best	80.0/100
Ingredient Quality	80.0/100 Best	70.0/100
Value for Money	80.0/100 Best	80.0/100 Best
Side Effects	80.0/100 Best	70.0/100
Certifications	80.0/100 Best	30.0/100
Best Price	£40.00 Holland & Barrett → Cheapest	£58.00 Holland & Barrett →
Form	None	powder
Dose	None	None
Third-Party Tested	✗ No	✗ No
Reviews Analysed	4	4

Critical Mass Professional Lean ...

Pros

✓Rapid results: Users report visible muscle gain and strength increases within 2-4 weeks
✓Strong, enjoyable flavor that encourages consistent use
✓High caloric density (1,000+ calories) supports the caloric surplus needed for lean mass gain
✓Informed Sport registered and Halal certified—meets testing and dietary standards

Cons

✗Very high calorie content may lead to excess fat gain if training stimulus is insufficient
✗Strong flavor (per reviews) may be overwhelming for some users even at reduced portions
✗Not third-party tested beyond Informed Sport registration; lacks independent lab verification
✗High sugar content in standard formulation (though 'reduced sugar' variant exists); not suitable for strict carb-controlled diets

Best For

Hard gainers and ectomorphs seeking rapid lean mass and strength Athletes in high-volume training phases requiring caloric surplus Individuals prioritizing convenience and taste over minimal processing Users following halal dietary requirements

Holland & Barrett £40.00

View full review →

Serious Mass Cookies & Cream 5.4kg

Pros

✓Excellent user satisfaction (100% 5-star reviews) with consistent praise for taste and smoothness
✓Comprehensive calorie and protein delivery (1,250 kcal + 50g protein) for serious mass gain goals
✓Added creatine monohydrate (3g per serving) supports performance and strength gains
✓Broad micronutrient fortification including vitamins B-complex, C, E, and minerals for recovery

Cons

✗Very high sugar content (12g per serving) and simple carbohydrates (maltodextrin) may cause energy crashes
✗Not third-party tested; no NSF Certified for Sport or similar verification
✗Multiple allergens (milk, soy, wheat, eggs) limit accessibility; high sodium (1.48g per serving)
✗High saturated fat per serving (4g) may be a concern for some cardiovascular profiles

Best For

Hard-gainers and individuals with high metabolic rates Muscle-building athletes in bulking phases Those needing convenient, calorie-dense nutrition Users who prioritize taste and mixability

Holland & Barrett £58.00 Amazon UK £66.99

View full review →

What does the data say about Critical Mass Professi... vs Serious Mass Cookies &...?

Both products aim to deliver serious calories for hard gainers, but they differ in a few meaningful ways. Applied Nutrition's Critical Mass scores 80/100 at £40 for 2.4kg, with a particularly strong effectiveness score of 90/100 — users report noticeable muscle and strength gains within a few weeks. Optimum Nutrition's Serious Mass scores 70/100 at £58 for a considerably larger 5.4kg tub, delivering around 1,250 kcal and 50g protein per serving, and it includes 3g of creatine monohydrate per serving — something Critical Mass lacks. Serious Mass leans heavily on maltodextrin and simple carbohydrates, which keeps calories high but may cause energy dips between meals.

If you're newer to mass gainers and want to test the category without committing to a huge tub, Critical Mass at £40 is the more sensible starting point, and its higher effectiveness score suggests you're likely to see results. If you're already confident in your training and nutrition and want a long-running supply with built-in creatine, Serious Mass makes more sense despite the higher upfront cost. Critical Mass comes only in banana here, which some find intense at full servings — worth halving the portion initially. Serious Mass in Cookies & Cream has strong user satisfaction for taste, but the sugar load is worth monitoring if you're prone to energy crashes.

Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) Winner 80.0/100

Applied Nutrition Critical Mass Professional is a high-calorie lean mass gainer (1,000+ calories per serving) designed for hard gainers and athletes seeking rapid weight gain.

Effectiveness

Critical Mass Pr..

90.0/100

Serious Mass Coo..

80.0/100

Ingredient Quality

Critical Mass Pr..

80.0/100

Serious Mass Coo..

70.0/100

Value for Money

Critical Mass Pr..

80.0/100

Serious Mass Coo..

80.0/100

Side Effects

Critical Mass Pr..

80.0/100

Serious Mass Coo..

70.0/100

Certifications

Critical Mass Pr..

80.0/100

Serious Mass Coo..

30.0/100

What are the key differences?

Critical Mass Professio.. is best for: Hard gainers and ectomorphs seeking rapid lean mass and strength, Athletes in high-volume training phases requiring caloric surplus

Serious Mass Cookies & .. is best for: Hard-gainers and individuals with high metabolic rates, Muscle-building athletes in bulking phases

Frequently Asked Questions

Which is better, Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) or Serious Mass Cookies & Cream 5.4kg? ▼

Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) scores 80.0/100 overall while Serious Mass Cookies & Cream 5.4kg scores 70.0/100. Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) comes out ahead, scoring higher on effectiveness (90.0 vs 80.0). Critical Mass Professional Lea is best suited for Hard gainers and ectomorphs seeking rapid lean mass and strength and Athletes in high-volume training phases requiring caloric surplus. Serious Mass Cookies & Cream 5.4kg is better for Hard-gainers and individuals with high metabolic rates and Muscle-building athletes in bulking phases.

Is Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) worth the price compared to Serious Mass Cookies & Cream 5.4kg? ▼

Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) costs £40.00 while Serious Mass Cookies & Cream 5.4kg is £58.00. For value, Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) scores 80.0/100 vs Serious Mass Cookies & Cream 5.4kg's 80.0/100. Both offer similar value for money.

Which has fewer side effects? ▼

Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings) scores 80.0/100 for side effects (higher means fewer reported issues) while Serious Mass Cookies & Cream 5.4kg scores 70.0/100. Reviewers report fewer side effects with Critical Mass Professional Lean Mass Gainer Banana 2.4kg (16 Servings). For certification and testing, Critical Mass Profes scores 80.0/100 vs Serious Mass Cookies's 30.0/100. Always consult a healthcare professional before starting any supplement.