Reflex Nutrition

Reflex Instant Mass Heavyweight (5.4kg)

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Reflex Instant Mass Heavyweight is Reflex Nutrition's "mega gainer" which at Echo we class as any product delivering over 1000 calories per recommended serving (in this case 1,160 calories!) and they have formulated it with quality first and foremost in mind

Reflex Instant Mass Heavyweight is Reflex Nutrition's "mega gainer" which at Echo we class as any product delivering over 1000 calories per recommended serving (in this case 1,160 calories!) and they have formulated it with quality first and foremost in mind

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ONLY £53.29
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Reflex Instant Mass Heavyweight

Reflex Nutrition Instant Mass Heavyweight

Reflex Instant Mass Heavyweight is Reflex Nutrition's "mega gainer" which at Echo we class as any product delivering over 1000 calories per recommended serving (in this case 1,160 calories!) and they have formulated it with quality first and foremost in mind.

To this end Reflex have only used highly bioavailable premium quality proteins including their trademark Native Whey Isolate (where many brands load up with cheaper soy protein) alongside top carbohydrate sources including Trehalose & Oat Flour - low GI, low sugar carbohydrates so you can get the benefits of a high volume of calories without loads of sugar too.

To top off this exceptional supplement Reflex have included the world's purest Creapure branded creatine monohydrate and a comprehensive vitamin and mineral complex. If you're looking for the best quality 1000+ calorie gainer, you found it!

Key Benefits

  • Protein Sources - as you might expect from Reflex Nutrition there are no cheap proteins (soya in particular is a major ingredient in many other gainers) and the blend is made up of Native Whey Isolate, Whey Protein Concentrate, Milk Protein (Casein), Egg White Protein, Hydrolysed Whey & Peptide Bonded Glutamine from wheat protein. This means the protein found in Instant Mass Heavyweight is all VERY highly bioavailable and also naturally VERY high in branched chain amino acids & glutamine
  • Carbohydrate Sources - once again the important thing to note is you don't see dextrose or fructose in the carbohydrate blend of Instant Mass Heavyweight. Reflex Nutrition have chosen to combine Maltodextrin, Oat Flour and Trehalose (a very slow digesting type of sugar) for a complex carbohydrate blend which won't give you a sugar crash soon after drinking it
  • Protein to Carb Ratio - a great thing about Instant Mass Heavyweight is that you can take half servings (150g serving) and still get a good amount of protein (30g) whereas in many other "mega gainers" which pack in over 1000 calories per full serving this isn't possible. This is due to the protein to carb ratio being just right to get the calories in without being too low in protein
  • Added Creatine, Vitamins & Minerals - on top of the awesome macronutrient formulation is the addition of a wide range of vitamins and minerals (including testosterone supporting zinc and magnesium) and 3g of creatine monohydrate which is a great supplement in itself for increasing size and strength
  • Increased Size & Strength - The inclusion of ultra pure Creapure Creatine into the Instant Mass Heavyweight formula means you will benefit from increased size and strength for as long as you take it every day. If you're using half servings of Instant Mass Heavyweight as described above then you may want to add in an extra scoop of Reflex Creapure Creatine to ensure you get a full effective dose every day
  • Good Flavour Choice - Reflex Instant Mass Heavyweight comes in four tasty flavours: Chocolate, Strawberry, Vanilla and Chocolate Peanut - so you need never get bored of the flavour as there are 3 other great options
  • Huge 5.4kg Bag - Instant Mass Heavyweight comes in a huge heavy duty bag so you get great value for money and because it isn't in a tub it doesn't take up too much room around the house

Who is Reflex Nutrition Instant Mass Heavyweight For?

Instant Mass Heavyweight is formulated for the hard gainer - if you feel like you just CAN'T put on any weight no matter how much you try and how much you eat then this is the product designed for you!

When to Use Reflex Nutrition Instant Mass Heavyweight?

You can have a serving at virtually any time of the day but obvious times to have a serving of Instant Mass Heavyweight would be pre and post workout (you can split one serving into half before and after instead, if one is too much before hand) and in-between meals. You COULD replace meals with Instant Mass Heavyweight but keep in mind you need to have a strong calorie surplus to add weight so make sure you're still getting more calories in overall!

Who Are Reflex Nutrition?

Reflex Nutrition is one of our top selling brands at Echo Supplements. Reflex place their focus on QUALITY above all else and as a result their range of supplements always provide effective dosages of the highest quality ingredients in the world. This is no exaggeration!

Reflex Nutrition Top 3 Supplements

Reflex Nutrition - Informed Sport Informed Sport

Manufactured in an Informed-Sport registered UK site.

Reflex Nutrition - Vegetarian Suitable For Vegetarians

This product is suitable for those following a vegetarian diet.

Reflex Nutrition - Albion Minerals Albion Minerals

Albion Minerals are the world leaders and innovator in mineral amino acid chelate technology meaning that the minerals found in Reflex Nutrition products from Albion Minerals are of a superior highly bioavailable form.

Reflex Nutrition - Halal Certified Halal Certified

Reflex Nutrition are a partner of the Halal Trust which certifies that this product is suitable for anyone that wants to ensure their supplements are Halal.

Nutritional Information Per Serving (300g)
Calories 1160
Protein 60g
Carbohydrate 219g
- of which sugars 3.3g
Fat 4.8g
- of which saturates 1.8g
- polyunsaturates 1.7g
- mono-unsaturates 1.1g
Fibre trace
Salt 0.69g
Vitamin A 400ug
Tocotrienols (DeltaGold) 7.5mg
Vitamin B6 1.6mg
Vitamin C 100mg
Thiamin 1.6mg
Riboflavin 1.6mg
Niacin 9mg
Vitamin D3 7.5ug
Folic Acid 100ug
Vitamin B12 1.2ug
Biotin 80ug
Pantothenic Acid 3mg
Magnesium 150mg
Iron 2.3mg
Copper 0.8mg
Zinc 7.5mg
Selenium 9ug
Chromium 50ug
Creatine Monohydrate 3000mg
Glutamine 1000mg
L-Choline 100mg
Piperine Extract (Bioperine) 5mg
Lactospore Bacillus Coagulan  

CarboBiotics (Maltodextrin, Oat Flour, Trehalose), High BV Protein Blend (Whey Protein Concentrate, Native Whey Protein Isolate, Milk Protein Concentrate, Egg White Protein Isolate, Hydrolysed Whey Protein (degree of hydrolysis 30%), Hydrolysed Whey Protein [degree of hydrolysis 4%]), Peptide-Bonded Glutamine (Derived from Wheat Protein), Creapure Creatine Monohydrate, Fat-Reduced Cocoa Powder (Chocolate varieties only), Flavourings, Colour (Betanin [Strawberries & Cream variety only]), L-Glutamine, Magnesium Citrate, Potassium Chloride (Choc-Peanut Butter variety only), L-Choline Bitartrate, Sweetener (Acesulfame K), L-Ascorbic Acid, Bacillus Coagulans (LactoSpore), Emulsifier (Soya Lecithin), Sweetener (Sucralose), Zinc Monomethionine, Tocotrienols ([DeltaGold] 35% total Tocotrienols of which 84-92% Delta-Tocotrienols, 8-16% Gamma-Tocotrienols), Iron Bisglycinate, Nicotinamide, Copper Aspartate, Selenomethionine (SeleniumSeLECT), Piperine Extract (Bioperine), Retinyl Acetate, D-Calcium Pantothenate, Cholecalciferol, Riboflavin, Thiamin Hydrochloride, Pyridoxine Hydrochloride, Colour (Beta Carotene [Vanilla Ice Cream variety only]), Chromium Picolinate, Pteroylmonoglutamic Acid, D-Biotin, Methylcobalamin, Anti-Caking Agent (Calcium Silicate).

For a full serving mix 300 g (approximately two level 250 ml measures) with 700 ml water in a suitable shaker cup or blender, mix until smooth.

  • New users of this product may find it easier to start with a ½ serving, and then slowly increase to one or more full servings per day as required by your calorie intake plan.
  • For a creamier, more calorie-dense shake try mixing with semi-skimmed milk instead of water.
  • Instant Mass Heavyweight is suitable for consumption throughout the day as required by your calorie intake plan.
  • Consume between meals to maintain a positive nitrogen balance. Consume 20 – 30 minutes post-workout to contribute to a growth in and the maintenance of muscle mass.
  • Consume 45 - 60 minutes before bed to contribute to the maintenance of muscle mass overnight.

The above is our recommended usage directions; You may of course mix with more of less liquid to reach the desired consistency and taste.

Reflex Nutrition

Reflex Nutrition produce some of the most highly regarded and recognisable on the supplements market today. With over two decades of experience, Reflex combine health and fitness to create a range of products which have you covered both in and outside of the gym.

Who are they?

Founded in 1996, Reflex Nutrition are based in Brighton, England, and run their own powder, capsule, drinks and bar manufacturing facilities, which makes them unique within Europe. This means that they have complete control over the manufacturing of their products, allowing for only the highest quality of product to leave their factory.

Reflex have always strived to produce the very best products that combine efficacy and broader consideration for general health. Their wide range of supplements cover everything from sports supplements to supplements for general health and wellbeing, making them one of the most versatile brands operating today.

Reflex Nutrition Key Supplements

Even with such a diverse range of products Reflex have still managed to produce a number of category leaders. Reflex One Stop Xtreme is one of the most popular weight gainers available and delivers outstanding results every time. This all in one is immense for gaining strength and size and is a must try for anyone looking to add some bulk.

Reflex also have a number of key supplements in other categories. Their 100% Whey Protein is known for its high quality and great taste, while their Thermo Fusion fat burner is one of our most popular products in the category.


We will take every effort to get you goods to you as efficiently and effectively as possible. All orders placed before 3pm will be shipped on the day of ordering subject to payment authorization and item availability.

Any items which are out of stock will be shipped as soon as they become available. If this causes a delay in your delivery, you will be notified and your order dispatched as soon as possible. If any items are unavailable, you will be contacted and offered a replacement or refund.

UK Delivery

If your order total is under £40 then you can choose one of:

  • Royal Mail Tracked - £2.95
    (1-3 Working Days)
  • DPD Next Day - £4.95
    (Guaranteed Next Working Day + 1 Hour Delivery Window)

If your order total is over £40 then you can choose

  • Royal Mail Tracked - FREE
  • DPD Next Day -1/2 Price - Only £2.49

Please be aware that the prices above are for areas classed as "UK Mainland" by DPD which does NOT include offshore islands, Scottish highlands or Northern Ireland.

Non-UK Delivery

Our website has a comprehensive postage system which takes into account the weight of your delivery and the destination address - to get a quote for your order please add the products you'd like to buy to your basket, go to the basket page and fill in the "Estimate Shipping & Tax" section to get the price.

BFPO Addresses

This shipping method is available for British Forces Posted Overseas and addresses only. Shipping is as with all other UK mailing but please check to see that the size and weight of your order does not exceed maximums for your BFPO destination number by checking with the BFPO website.

Please note that once we have shipped the item and handed over to the BFPO service we have fulfilled our contract and delivery responsibility. All queries and problems with delivery must be taken up by yourself with BFPO and any claims must be handled between yourself and them.

VAT Exempt

If this applies to you, the price you will pay for the goods will automatically be adjusted to remove the VAT element - you MUST choose the correct country on checkout for this to apply. We CANNOT refund the VAT once the order is completed.

You can also avoid paying VAT if you are having your goods sent to you in the UK, but are taking the goods abroad permanently within 3 months of making the purchase. You will have to pay the VAT with your order but by following the steps outlined you can reclaim the VAT from us:

Request a VAT Reclaim form from us; give us a call or email immediately after ordering. We will complete the relevant parts of this form before sending it to you with your goods. You will then take the form with you and the goods when you leave the UK and you should ask customs to fill in their section of the form at the airport, ferry terminal or channel tunnel when you leave the country.

When you reach your destination outside the EU, you can then send the completed form back to us and we will refund the VAT amount charged to the credit or debit card details you have filled in on the reclaim form


We stock the vast majority of products listed on our website in our Whitley Bay superstore and warehouse and these products are available for same day dispatch & next day delivery.

Due to the huge quantity of products we stock, we offer the ability to backorder products which have gone out of stock and less popular products which we don't carry stock of.

Depending on the brand these backorder products can take anywhere between 1 and 10 days to arrive into stock. We estimate 3-5 working days on average but please be aware that products from some brands can take a little longer

As always if you aren't sure or want a more accurate estimate just give our team a call or email!


You can return any product that is in an UNOPENED, RE-SALEABLE condition within 30 days as long as it is not marked as clearance. Please contact us before doing this so we can confirm this ahead of time - we recommend using a recorded delivery service for any returns as you will be responsible for ensuring it reaches us.

Please get in touch to confirm a return by email or phone before sending anything back. When sending a return it is important that you include:

  • Your order number
  • Your name & a contact telephone number
  • The reason for return

We will try and get your return processed as quickly as possible but if you don't send this information it can delay the return.


If you have ordered something and it doesn't fit then we can exchange for a more suitable size, stock permitting, but you will have to pay the return postage.


Our customers have the right to cancel their orders within 14 days unless their order has been dispatched. After the order has been dispatched, it is the customers responsibility to return the item in a saleable condition and receieve either a full or partial refund.

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