Instant Mass Heavyweight

Instant Mass® Heavyweight – our best weight gainer for the hard gainer.

Reflex Nutrition’s newest and best weight gainer designed specifically for hardgainers and all athletes wanting a very high quality source of protein and complex carbohydrates. A formula designed to outperform in every area and will rewrite your expectations of what a weight gainer can deliver.

Heavyweight delivers in 5 key areas where other weight gainers simply do not.

Heavyweight High BV Quattro® Protein Complex provides a massive 60 grams of protein

Arguably the most sophisticated and best protein blend in a weight gainer that you won't find in any other product. Quattro® is unique to Heavyweight, exclusively from Reflex Nutrition. It consists of three different types of whey protein in conjunction with pure undenatured micellar casein. Four of the best!

What is Quattro® Protein Complex?

To trigger new muscle growth you need to train hard and consume the best high quality sources of protein. Quattro® protein complex is one of the best combinations of protein science has to offer - specific forms of whey protein and micellar casein.

However, we don't use just any type of whey proteins for Heavyweight, first we use two different hydrolysed (pre-digested) whey proteins; one has a High DH (degree of hydrolysis meaning how much it's been pre-digested) which the human body can absorb almost instantly, the second has a Low DH providing the human body with a secondary hit of whey peptides.

Third, we use a preferentially selected whey protein concentrate in conjunction with unique native whey protein isolate that is chosen for its high levels of bioactive fractions and superior branched-chain amino acid (BCAA) content.

Fourth, we add pure ultra-filtered micellar casein that is digested over a longer period of time feeding your body with essential amino acids for up to 4 hours providing excellent anti catabolic activity.

Note: Does not contain soy protein like some brands, soy has a lower biological value compared to whey.

Heavyweight Carbiotics™ Carbohydrate Complex, with no added sugars

Many weight gainers today contain lots of empty calories from simple sugars like fructose and dextrose. Heavyweight is different. It’s one of the best weight gainers containing a unique blend of the finest oats, maltodextrin and treaholse it provides a serious source of fuel for your body that’s free from corn syrup, fructose and simple sugars.

Heavyweight Muscle & Strength Stack

Gaining muscle mass is not easy, and few companies understand the importance of micro nutrients and the key role they play in stimulating massive gains like Reflex Nutrition. We’re trawling through research on a daily basis to find out what works for you. As a result Heavyweight contains a stack of the World’s purest most proven Creapure Creatine with added Zinc, Magnesium and Vitamin D.

Heavyweight Immune Support

If you train hard you will be subjecting your body to significant demands, a time where it’s advisable to provide your body with additional support. Each serving of Heavyweight provides EU approved doses of vitamins and minerals that support a healthy immune system. These include Vitamin C, Vitamin D and Copper.

Heavyweight Awesome Flavour, Mixability and Ease of Use

Instant Mass Heavyweight tastes amazing, it’s a shake that mixes very easily in a shaker and tastes delicious. It comes in 5 mouth-watering flavours. Use this amazing weight gainer between meals and post workout.




Available in:

  • Chocolate Perfection
  • Strawberries & Cream
  • Vanilla Ice Cream
  • Chocolate Peanut Butter      



Available in:

  • Chocolate
  • Strawberry
  • Vanilla

Are you using a multivitamin?

If you're serious about your training and health, you are likely to be using a multivitamin.
The question is whether you are choosing the best possible product. If you don't currently use NEXGEN® or NEXGEN® PRO, then you owe it to yourself to find out more.
These products are made by us in capsule form for greater absorption and they contain chelated mineral and vitamin forms which are higher quality and more readily used by the body than oxide forms that are used by most other brands.
They include an array of the most appropriate ingredients many of which are patented and found in higher dosages than the competition.

Manufacturing since 1996, we are the UK’s No.1 sports nutrition manufacturer.

The world's finest sports and health supplements, made by the UK's No.1 sports nutrition manufacturer since 1996.
Made to deliver results and independently verified by the UK's most prestigious laboratories. Our supplements have been the choice of hundreds of thousands of people who demand not just guaranteed quality but supplements that deliver more. That means more active ingredients, higher levels of protein, more impressive innovation and less additives.
From the unbeaten levels of protein in our powder products to the multivitamins that contain unmatched potency and range of micro nutrients, our products are simply in a league of their own.
All products are offered with a full satisfaction money back guarantee - please see the official website for full details.

™ is a trademark of Reflex Nutrition Ltd. Instant Mass® is a registered trademark of Reflex Nutrition Ltd. LactoSpore® and Bioperine® is a registered trademark of Sabinsa Corporation. DeltaGold® is a registered trademark of American River Nutrition inc.


Serving Suggestions:

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.

Product is best consumed immediately once mixed.

Do not leave mixed product to stand, or leave in warm environments for extended periods.

The scoop included with the product measures by volume not by weight, for precise measurements please use measuring scales.

This product is sold by weight not by number of servings.

†a Measuring scoop is included with this product but may settle to the bottom during transit


CarboBiotics™ (Maltodextrin, OAT Flour, Trehalose), High BV Protein Blend (MILK Whey Protein Concentrate, MILK Native Whey Protein Isolate, MILK Protein Concentrate, EGG White Protein Isolate, MILK Hydrolysed Whey Protein (degree of hydrolysis 30%), MILK 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).

Storage Instructions:

Store in a cool dry place away from direct sunlight. To preserve the product once opened always tightly screw the lid back on and avoid exposing the remaining product to humid air.

Guidance Notice:

This product is a food supplement and should be used in conjunction with food as part of a healthy balanced diet, not as a substitute for such.
Use as part of a healthy and active lifestyle.

This product is not intended for use by persons under the age of 16.
Keep out of reach of young children.
Do not exceed the stated daily dose.

Heavyweight Nutritional Profile 100g NVR 300g
Energy (KJ) 1640    4921
Energy (kcal) 387   1160
Protein 20g    60g
Carbohydrate 73g   219g
        Of which Sugars 1.1g   3.3g
Fat 1.6g   4.8g
        Of which Saturates 0.6g   1.8g
        Polyunsaturates 0.6g   1.7g
        Mono-unsaturates 0.4g   1.1g
Fibre trace   trace
Salt 0.23g * 0.69g
Vitamin A 133.3μg 50 400μg
Tocotrienols (DeltaGold®) 2.5mg * 7.5mg
Vitamin B 60.5mg 114 1.6mg
Vitamin C  33.3mg  125 100mg
Thiamin 0.53mg 145 1.6mg
Riboflavin 0.53mg 114 1.6mg
Niacin 3mg 56 9mg
Vitamin D 32.5μg 150 7.5μg
 Folic Acid 33.3μg 50 100μg
 Vitamin B 120.4μg 48 1.2μg
 Biotin  26.7μg 160 80μg
Pantothenic Acid 1mg 50 3mg
Magnesium 50mg 40 150mg
Iron 0.77mg 16 2.3mg
Copper 0.27mg 80 0.8mg
Zinc 2.5mg 75 7.5mg
Selenium 2.7μg 49 9μg
Chromium 16.7μg 125 50μg
Creatine Monohydrate   1,000mg 3,000mg
Glutamine   333.3mg 1,000mg
L-Choline   33.3mg 100mg
Piperine Extract (Bioperine®)   1.67mg 5mg
LactoSpore® Bacillus Coagulan 166,666,666
* 500,000,000

NRV (Nutrient Reference Value) where given is based on reference intake values from Regulation (EU) No 1169/2011 of October 2011.