Pack on size, build serious muscle mass, and hit your daily surplus with our Mass Gainer collection at 123nutrition. Specially designed for hardgainers, bodybuilders in a bulking phase, and high-burn endurance athletes, these all-in-one formulas make consuming the calories required for growth effortless. Choose between Lean Mass Gainers (balanced 3:1 carb-to-protein ratio for quality muscle addition) and Extreme Weight Gainers (loaded with complex carbs and healthy fats for maximum caloric intake). Delivering a massive 30g–50g of multi-stage protein and 500–1200+ kcal per serving, our gainers come in large, value-packed 2.5kg, 5kg, and 6kg tubs (100g–300g per full serving). Available in indulgent classics like Milk Chocolate, Vanilla Ice Cream, and Cookies & Cream, they blend smoothly with water or full-fat milk. Formulated with clear allergen information (milk, gluten, and soy) and featuring vegetarian-friendly options.
Enjoy fast UK delivery (free on orders over £50) and simple 30-day hassle-free returns. Need help structuring your bulk? Read our Choosing the best mass gainer for you.
Frequently Asked Questions
Q: What is the difference between Whey Protein and a Mass Gainer?
A: Whey protein delivers concentrated protein with minimal calories (~120 kcal) for lean recovery. Mass gainers combine high-quality protein with complex carbohydrates and fats to deliver substantial calories (500–1200+ kcal) to help you stay in a caloric surplus.
Q: Do I need to drink a full serving size every time?
A: Not necessarily! If a full serving feels too heavy, you can easily split it into two half-servings—taking one in the morning and one post-workout or before bed—to spread out your calorie intake comfortably throughout the day.
