Hugo Dover

"Very quick delivery. Used 3 times, each order arrived the next day before 12:00. Product quality is exactly as described."

Hugo Dover Verified
Elina Goulliard

"Reliable & original products, with fast next day delivery. Have been using Welzo for over a year now."

Elina Goulliard Verified
Elizabeth Moore

"Welzo is great, lots of support from customer service who are easy to get a hold of and quick delivery."

Elizabeth Moore Verified

Mutant Mutant Mass Extreme 2500

1 Reviews
£57.46
Save 11% £64.75

Mutant Mass Extreme is a calorie rich mass gainer that helps you bulk up when eating enough is the tricky part, delivering energy and protein to support growth.

Purchase options

Delivery 33 bought this week

Quantity

4+Save 5% 4Save 5%
Verified Authenticity
Money-Back Guarantee
Easy Returns

100% Money back guarantee, no questions asked

Secure Transaction

VISA Pay AMEX Pay
Excellent Trustindex

Fast UK delivery from £3.99

Order within for next-day delivery

As seen in

Mutant Mass Extreme is a calorie rich mass gainer that helps you bulk up when eating enough is the tricky part, delivering energy and protein to support growth. It uses a three phase whey protein blend to fuel muscles with amino acids across the day, aiding recovery after demanding sessions. [This product is backed by a brand with a longstanding focus on weight gain and real world usage], it leans on whole food carbohydrates and fats.

Benefits & Features:

  • Supports high calorie intake for rapid mass gains.
  • Delivers protein from a multi phase whey protein powder blend to sustain muscle protein synthesis.
  • Carbohydrates come from a clean blend of maltodextrin and starches, giving steady energy for workouts and shakes
  • Supports recovery with added glutamine and BCAAs, helping you bounce back faster between sessions and stick to your training plan for ongoing gains and consistency.
  • Calorie dense formula designed for quick mixing to fuel meals on the move with muscle building protein powder.

Mutant Mass Extreme is built around the idea that hard gainers deserve serious calories. The formula blends whole food carbs from barley, rolled oats and sweet potato with fats from coconut oil, avocado and pumpkin seed. The protein comes from a three phase whey protein blend and is supported by added glutamine and BCAAs to aid recovery. An enzyme blend helps digestion, while cinnamon extract and tart cherry flavour add finishing touches you’ll enjoy.

Calories, Total Fat, Saturated Fat, Trans Fat, Cholesterol, Sodium, Total Carbohydrate, Total Sugars, Incl. Added Sugars, Protein, Vitamin D, Calcium, Iron, Potassium

GTIN
811662029526
Manufacturer
Mutant
Size
Triple Chocolate / 5450 grams
Best buy
6 to 24 months+

United Kingdom & Rest of the World Shipping Details:
Same day dispatch for orders placed by 2pm (Orders after 2pm dispatched next working day).

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 14 days in the same original and unopened packaging. Subject to T&C's.

Welzo is a UK-based health platform. Orders ship from the UK.

Mix 4 scoops (285g) of MUTANT MASS EXTREME 2500 with 475ml of water or milk in a shaker or blender for 15-20 seconds. Consume 1-2 servings daily, ideally post-workout or between meals to support muscle growth. Store in a cool, dry place, away from direct sunlight and moisture. Keep out of reach of children. This product may expose you to chemicals including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Consult a healthcare professional before use if pregnant, breastfeeding, taking medication, or have a medical condition. Do not exceed the recommended daily dose.

Please consult the product packaging for accurate instructions on how to use the product.

  Amount
Per 100g
Amount
Per Serving
%RI*
Calories 1571.9298 kJ / 375.4386 kcal 4480 kJ / 1070 kcal
Total Fat 1.0526 g 3 g 4%
Saturated Fat 0.7018 g 2 g 10%
Trans Fat 0 g 0 g
Cholesterol 15.7895 mg 45 mg 15%
Sodium 87.7193 mg 250 mg 11%
Total Carbohydrate 81.0526 g 231 g 84%
Total Sugars 1.4035 g 4 g
Incl. Added Sugars 0 g 0 g 0%
Protein 10.5263 g 30 g 60%
Vitamin D 0 µg 0 µg 0%
Calcium 52.6316 mg 150 mg 10%
Iron 0.7018 mg 2 mg
Potassium 280.7018 mg 800 mg 15%
KEY AMINOS AND ENZYMES
(L-Leucine (BCAA)(as protein): 3.1 g, L-Valine (BCAA)(as protein): 1.6 g, L-Glutamine and Glutamic Acid (as protein): 5 g, L-Isoleucine (BCAA)(as protein): 2 g, Enzyme Blend (Lactase, Protease): 25 mg)

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: Whey Protein

Whey protein from a multi‑phase blend provides a high‑quality source of amino acids to support muscle recovery and growth. This form combines whey concentrate, whey isolate, and hydrolysed whey to optimise digestibility and utilisation.

What Does Whey Protein Do?

Whey protein participates in supporting muscle protein synthesis and helps maintain positive protein balance as part of a balanced diet. It also supports normal muscle function and recovery through essential amino acids recognised in nutrition guidelines.

This product is not intended to diagnose, treat, cure, or prevent any disease.

Mutant Mass Extreme is backed by Mutant, a brand that presents a detailed ingredient profile and a formulation designed for high-energy support. This brand stands out for its clear disclosure of components and its use of whole food sources such as rolled oats, barley and sweet potato in the blend, which aligns with our preference for transparent manufacturing choices. Our medical team evaluates brands like Mutant to ensure they meet Welzo's stringent standards for safety and quality, and this evaluation is supported by our commitment to rigorous testing and certifications through our supplement quality standards. We favour brands that provide a robust protein and calorie matrix alongside digestion support, which Mutant Mass Extreme delivers through its multi-phase whey blend and enzyme aids. This brand fits well within our portfolio due to its clear formulation focus and alignment with the needs of active individuals seeking calorie-dense, protein-rich supplementation. For ongoing assurance, our medical team and quality controls continually review partnerships: our medical team and our supplement quality standards.

Part of the Welzo System™

Test, supplement, enhance, and move, all in one place.

33 bought this week
30-Day Money Back Guarantee
GMP Certified Facilities
Third-Party Tested
Vegan & Non-GMO
Rated Excellent
by 30,000+ Positive ReviewsTrustindex verified
Rated 4.8/5 by 27,000+ Customers
UKAS Accredited Labs
Free Next-Day Delivery Over £50
Science-Backed Formulations

Frequently Asked Questions

Everything you need to know about this product.

Third Party Tested
Trusted by 200,000+ Customers
Pharmaceutical-Grade Quality
UK-Based Customer Support