Instant Mass® Heavyweight

From: £34.99

3.67 out of 5
  • Our most calorie-dense weight gainer
  • Specially formulated for hard gainers
  • 1,160 calories, 60 g protein, 219 g carbohydrates, 3 g Creapure® creatine per shake
  • Packed with 18 added vitamins and minerals

What is Instant Mass® Heavyweight?

Instant Mass® Heavyweight is a protein shake designed specifically for hardgainers and athletes wanting a very high quality source of protein and complex carbohydrates.

Each serving provides a huge 60g of protein, 219g carbs, and 1,160 calories in every shake. In order to provide such a huge dose of protein, Reflex Nutrition has created the Quattro® protein blend, which is four of the best types of whey protein together with micellar casein to provide a huge protein hit.

Instant Mass® Heavyweight delivers a blend of complex carbohydrates to provide your body with a serious source of fuel without simply adding sugars, corn syrups, or fructose. It also contains a massive 18 added vitamins and minerals to support your physical goals before, during and after training.

Who is it for?

Instant Mass Heavyweight has been created for hardgainers and athletes who train intensely but find it difficult to gain muscle and weight.

Hardgainers need a high-calorie, carb heavy diet to boost their training, with a large protein hit to feed their muscles. Instant Mass® Heavyweight provides the calories, carbohydrates and protein hardgainers need to boost their training.

Instant Mass® Heavyweight is a vegetarian product, but it is not suitable for vegans, coeliacs, or anyone under the age of 16.

What are the benefits?

  • Contributes to the growth of muscle mass
  • Combines four of the best protein sources
  • Uses the world’s purest creatine

If you are a hardgainer, you’ll know how difficult and frustrating it can be to train hard without seeing the desired returns. A hardgainer is simply a term for someone with an ectomorphic body type, meaning a high metabolism and a predisposition for low body fat level which makes gaining muscle mass and weight difficult.

It contains the following;

  • Vitamin B12 which contributes to the reduction of tiredness and fatigue
  • Vitamin B6 which contributes to the normal function of the immune system
  • Vitamin C which contributes to the normal function of the immune system during and after intense exercise
  • Iron which contributes to normal formation of red blood cells and haemoglobin
  • Zinc which contributes to normal carbohydrate metabolism
  • Copper which contributes to the maintenance of normal connective tissue
  • Chromium which contributes to the maintenance of normal blood glucose levels

Recommended Usage

Mix 300g (approximately two level 250ml measures (there is a scoop included in the tub)) with 700ml water in a shaker or blender. Consume one to two shakes a day.

When just starting the product, users may find it beneficial to begin with half the quantity before slowly increasing to the full serving, as per personal calorie plan.

Consume Instant Mass® Heavyweight between meals to maintain a positive nitrogen balance, and drink 20-30 minutes after a workout for optimal results. Alternatively, take Instant Mass® Heavyweight 45-60 minutes before bed to contribute to muscle maintenance overnight.

How is it made?

The whey protein concentrate and whey protein isolate in Instant Mass® Heavyweight are made by separating the whey protein from the other components in milk. Hydrolysed whey protein is treated with enzymes to make it even faster to digest, while egg white protein is treated in order to remove the protein from the other components making up the egg.

How does it taste?

With extensive research, our team has created, in our opinion, the best tasting hardgainer shake on the market today. It mixes easily, with a milkshake texture, and comes in four flavours:

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

The science behind it

The high BV Quattro® Protein Complex in Instant Mass® Heavyweight provides the body with a huge 60g of protein from whey protein concentrate, native whey protein isolate, egg white protein isolate, and hydrolysed whey protein. 

A whopping 1,160 calories per shake literally feed the body energy, while 219g carbohydrates provide a long-lasting comprehensive energy source to enable the body to work out for longer, more intense periods.

Anything else?

Available in 5.4kg bags.

Once mixed, consume the shake immediately and don’t leave to stand. For a shake that is more calorie-heavy and creamier, try the product with semi-skimmed milk.

This product is a food supplement and should be used in conjunction with food, not as a replacement for such.

Suitable for

  • Vegetarians: Yes
  • Vegans: No
  • Coeliacs: No

Instant Mass® Heavyweight (all flavours) has been certified as Halal safe by The Halal Trust.

For further allergy advice, please read our suitability guide.


CarboBiotics™ Carbohydrate Blend (61%) (Maltodextrin, OAT Flour, Trehalose), High Biological Value Protein Blend (16%) (Whey Protein Concentrate (MILK), Native Whey Protein Isolate (MILK), MILK Protein Concentrate, EGG White Protein Isolate, Hydrolysed Whey Proteins (MILK), Peptide-Bonded Glutamine (WHEAT)), Creapure® Creatine Monohydrate, Cocoa Powder (5%) (chocolate varieties only), Flavourings, Colour (Betanin (strawberries & cream variety only)), L-Glutamine, Magnesium Bisglycinate, 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 Bisglycinate, Tocotrienol-Rich Annatto seed extract (DeltaGold® - 35% total tocotrienols of which 84-92% Delta-Tocotrienols, 8-16% Gamma-Tocotrienols), Iron Bisglycinate, Nicotinamide, Copper Bisglycinate, 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 allergens, including cereals containing gluten, see ingredients in BOLD.

Nutritional Information

Chocolate Perfection         Chocolate Peanut Butter       Cookies & Cream
Instant Mass Heavyweight - Chocolate PerfectionInstant Mass Heavyweight - Chocolate Peanut Butter Instant Mass Heavyweight - Cookies and Cream

Strawberries & Cream             Vanilla Ice Cream                          
Instant Mass Heavyweight - Strawberries and CreamInstant Mass Heavyweight - Vanilla Ice Cream

Product Label


3 reviews for Instant Mass® Heavyweight

  1. Rated 5 out of 5


    Bought Instant Mass Heavyweight( Chocolate Perfection 2.4kg) at Holland & Barrett store in King’s Lynn. To be honest, the taste is perfect! The best tasting powder that I have ever tried. So, if you are concerned about the taste, this product is the best for you!
    Will be definitely purchasing more Reflex Nutrition products, and I hope that one day I would become a Reflex Nutrition ambassador!

  2. Rated 1 out of 5


    Hi. Im a regular Reflex user but I’ve just realised that there are more calories pound for pound in my last purchase ‘reflex pro’ than in my latest purchase ‘reflex mass heavyweight’?

    • Nathan Chan

      Hi Liam,
      Pro has a couple of calories less than Heavyweight per 100g but obv the serving sizes differ. Also Heavyweight has additional ingredients including Creapure creatine. If you have any questions about the product, please email [email protected]

  3. Rated 5 out of 5

    Florian (verified owner)

    J’ai choisi le goût Chocolate perfection.

Add a review