Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer vs Serious Mass Cookies & Cream 5.4kg

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

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