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Critical Mass Professional® – The UK’s #1 Lean Mass Gainer
Looking to build serious size and strength? Critical Mass Professional® is the UK’s most trusted mass gainer supplement, crafted for those who demand high-quality lean muscle gains without unnecessary sugars or fillers.
Formulated with premium-grade ingredients and our new reduced sugar blend, each serving delivers a powerful 42g of both fast- and slow-digesting proteins, including ISO-XP® 95% Whey Protein Isolate — one of the purest and most effective proteins on the market.
 
✅ Why Choose Critical Mass Professional®?
New Reduced Sugar Formula – Clean calories for lean muscle growth
42g of High-Quality Protein per Serving – Includes fast and slow-release proteins
Enhanced Muscle Support – With added HMB, Glutamine, Leucine, and a Creatine Matrix
Creatine Monohydrate – Boosts short-term, high-intensity performance
Essential Healthy Fats – Includes CLA and MCT Powder for energy and metabolism
High-Calorie Shake – Ideal for athletes and hard gainers
Chromium – Supports normal macronutrient metabolism
Stack Friendly – Pairs perfectly with iDRIVE® Insulin Driver
Halal Certified – Quality you can trust, suitable for Halal diets
 
Whether you’re bulking up, increasing strength, or breaking through a plateau, Critical Mass Professional® gives you the nutritional edge you need to fuel your training and transform your physique — faster and smarter.
 
Join thousands of UK athletes and fitness enthusiasts who trust Critical Mass Professional® for clean, powerful, and consistent results.