Critical Mass Professional Lean Mass Gainer Strawberry 6kg (40 Servings) vs Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer

Pros

• ✓1,000+ calories per serving well-suited to hard gainers who struggle to hit caloric surplus
• ✓Informed Sport registered — meaningful third-party quality and contamination testing
• ✓Comprehensive formula beyond just protein: creatine monohydrate, HMB, glutamine, CLA, and MCT
• ✓Reduced-sugar formulation compared to older mass gainers — favourable for lean bulk

Cons

• ✗Taste inconsistency across batches — some report a chemical or medicinal aftertaste in the strawberry flavour
• ✗150g per serving is a very high volume, potentially difficult for smaller individuals or those with lower appetite
• ✗Not vegan — whey-based formula unsuitable for plant-based users
• ✗1,000+ kcal per serving requires careful use; excess can lead to unwanted fat gain if training volume is not sufficient

Best For

Pros

• ✓Highly effective for calorie surplus and weight gain, with multiple reviewers reporting measurable mass gains (e.g. 2 stone in 3 months with training)
• ✓Strong long-term loyalty — several reviewers report 5–10+ years of consistent use
• ✓Good flavour profile (strawberry and banana rated as milkshake-like)
• ✓Excellent calorie density (1,250 kcal/serving) makes it practical for those who struggle to eat enough food

Cons

• ✗Inconsistent quality between batches — at least one reviewer reported a virtually flavourless delivery
• ✗Mixing challenges: oversized scoop won't fit most shaker bottles, and blender is often needed to avoid clumping
• ✗Digestive discomfort (bloating, gas, heaviness) reported by multiple users — typical of high-maltodextrin mass gainers
• ✗Premium price point relative to own-brand alternatives, though most reviewers consider it justified

Best For