Reflex Nutrition Instant Mass Heavyweight

Energy, Fat, of which saturates, Carbohydrate, of which sugars, Fibre, Protein, Salt, Vitamin A, Vitamin D3, Vitamin E, Vitamin C, Vitamin B1, Vitamin B2, Niacin, Vitamin B6, Folic Acid, Vitamin B12, Biotin, Pantothenic Acid, Zinc, Selenium, Chromium, Amino Acids, L-Glutamine, Creapure Creatine Monohydrate, Other Vitamins & Minerals, L-Glutamine, L-Choline, Creapure Creatine Monohydrate, Bio Perine Piperine, LactoSpore Bascillus coagulans

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 300g (approximately two level 250ml measures for the 5.4kg size or five level 60ml measures for the 2kg size) with 700ml of water in a shaker or blender. For optimal results, consume Instant Mass Heavyweight between meals to maintain a positive nitrogen balance, or drink 20-30 minutes after a workout. Alternatively, take it 45-60 minutes before bed to support muscle maintenance overnight. Once mixed, consume the shake immediately and do not leave to stand. Store in a cool, dry place, away from direct sunlight and moisture. Keep out of reach of children. This product is not intended for use by persons under the age of 18. Do not exceed the recommended daily dose.

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

*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 is a solid, high-quality source of essential amino acids and quickly absorbed proteins that help normal muscle repair and growth after training.

This blend brings whey protein concentrate and whey protein isolate as part of a protein complex, sourced to deliver a full amino acid profile for steady support of muscle metabolism.

What Does Whey Protein Do?

Whey protein helps with delivering essential amino acids and supports normal muscle upkeep and recovery. NHS guidance notes protein plays a key role in muscle health, while EFSA backed concepts recognise the importance of amino acids for protein synthesis.

This section looks at how a top-notch protein source contributes to everyday bodily functions and athletic performance in a balanced nutrition plan.

This supplement isn’t meant to diagnose, treat, cure, or prevent any disease.

Why Reflex Nutrition Instant Mass Heavyweight is Welzo Selected

Reflex Nutrition is our trusted partner for premium mass gain, produced in the UK within state-of-the-art facilities that prioritise quality and safety. The brand’s reputation for professional-grade sports nutrition and their commitment to premium raw materials underpin our confidence in this collaboration. Reflex Nutrition adheres to strict UK/EU food safety and supplement regulations, reinforcing the safety and reliability of every batch.

Our vetting criteria centre on rigorous quality standards, practical quality assurance in production, and a track record of manufacturing excellence. Reflex’s robust in-facility QA processes and their sustainable, high-standard production environment align with our mission to offer products you can trust. This brand stands out for its integrated approach to ingredient quality and reliable formulation, which makes it an ideal fit for a high-calorie mass gainer that delivers substantial protein and energy per serving.

This partnership was evaluated by our team of medical experts for compliance with the standards we enforce, ensuring consistency with Welzo’s quality expectations and customer safety.