1088kcal Per Serving
60g Protein | 200g Carbs
Reflex Nutrition Mass Heavyweight 5.4kg - 5.4kg / Chocolate
Reflex Nutrition

Reflex Instant Mass Heavyweight - Hard Gainer Formula

★★★★★
| 0 reviews |  18 Servings
£44.95 £78.99 £2.50/serving
Easier Size Support Helps when food falls short
More Complete Support Built for easier size work
Easy To Keep Ordering Useful for longer phases
Chocolate
Out of stock
Strawberry
Out of stock
Vanilla
Out of stock
Next Day · 30-Day Returns · UK Made
Delivery & Shipping

Free Delivery

Spend £80 on this brand for Free Delivery. Order before 4pm for same-day dispatch.

Standard Delivery 2-4 Working Days
£4.99
DPD Next Day Order by 4pm Mon-Fri
£5.99
30 Day Returns

If you are not 100% satisfied with your purchase, you can return the product and get a full refund or exchange.

Payment & Security
100% Secure Checkout
Encrypted with 256-bit SSL security
Klarna
Buy Now, Pay Later
Pay in 3 interest-free instalments of £14.98. No fees.
Accepted Payment Methods
We offer flexible payment options including Buy Now, Pay Later with Klarna and Clearpay. We also accept all major UK credit & debit cards

Food supplements should not be used as a substitute for a varied and balanced diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication, or under medical supervision, consult your doctor before use. Do not exceed the recommended daily intake. Store out of reach of children.

Chocolate Out of stock
Strawberry Out of stock
Vanilla Out of stock

Mass Heavyweight 5.4kg for Easier Calorie and Mass-Gain Support

Mass Heavyweight 5.4kg is designed for people who need an easier way to raise calorie intake around training. It suits gaining phases, busier routines and harder training blocks where food alone is not always enough to keep intake on track. That makes it a practical option when consistency is the challenge and you want a more convenient way to support bodyweight and recovery goals.

Each serving provides 60g of protein and 1088kcal (300.0g serving). This macro profile suits anyone looking for a lean protein source that supports daily intake without excessive calories.

Each pack contains 18 servings, with a 300.0g serving size. Mix with water or milk as part of a daily routine around training or between meals. Consistent use tends to deliver better results than sporadic intake.

Reflex Instant Mass Heavyweight - Hard Gainer Formula is manufactured by Reflex Nutrition. Contains milk, wheat (gluten, from glutamine peptides), soy (lecithin in whey protein concentrate). Made in the UK. Check flavour label for complete allergen information. Full ingredient and allergen details are listed on this page and on the product packaging.

Key Benefits

Massive Calorie Hit

1088kcal per serving from complex carbs and tri-blend protein - built for those who genuinely struggle to gain size.

60g Protein Blend

Whey concentrate, micellar casein, native whey, and hydrolysed whey deliver fast and sustained amino acid release.

Made in the UK

Reflex Nutrition manufactures in the UK to GMP standards with no unnecessary fillers - high-grade ingredients throughout.

Frequently Asked Questions

What is Mass Heavyweight 5.4kg best used for?

Reflex Instant Mass Heavyweight - Hard Gainer Formula works best between meals or as a post-training shake when you need a high-calorie protein hit. At 1088kcal per serving, it adds significant daily intake, so factor it into your overall meal plan rather than adding it on top of everything else. Morning or post-workout tends to work best for most people.

When should I use Mass Heavyweight 5.4kg?

Most people use products in this category after training, between meals or at another point in the day where higher calorie intake is easiest to repeat. Consistency matters more than chasing one exact timing rule.

Can I mix Mass Heavyweight 5.4kg with milk?

Yes, you can mix Reflex Instant Mass Heavyweight - Hard Gainer Formula with milk if you prefer a thicker texture and want extra protein and calories per serving. The 300.0g serving is already calorie-dense, so mixing with water keeps the total intake lower if you are tracking closely. Either works - choose based on your daily calorie target.