Instant Mass® PRO

From: £59.99

5.00 out of 5
  • An ultra high-quality, low GI weight gainer
  • 524 calories, 54g protein, 60g carbohydrates per serving
  • A near perfect balance of 50/50 protein and carbohydrate
  • Includes the Reflex Quattro® time-release protein blend

What is Instant Mass® PRO?

Instant Mass® PRO is our state of the art protein shake designed for gaining weight.

With a near perfect balance of 54 g whey protein and 60 g carbohydrate, Instant Mass® PRO is formulated to contribute to muscle growth and maintenance. Instant Mass® PRO contains the Reflex Quattro® time-release protein blend which delivers whey protein, hydrolysed whey protein, native whey protein isolate and micellar casein, four of the best sources of protein.

We introduced Instant Mass® over 10 years ago, when it was the first weight gainer in the world to deliver EU sourced whey protein alongside whole grain carbohydrates over simple sugars. Instant Mass® PRO is now even better, with EU sourced whey, micellar casein, nutrients, and carbohydrates from whole grain oats and barley.

Who is it for?

Instant Mass® PRO has been formulated for both men and women aiming to gain weight and muscle mass. 

Those looking to increase their daily protein and carbohydrate intake can benefit from Instant Mass® PRO. This product has been and remains a firm favourite with athletes all over the world.

Instant Mass PRO is a vegetarian product, but it is not suitable for vegans or coeliacs.

What are the benefits?

  • Helps to maintain and build muscle mass
  • Contains added nutrients
  • Provides a slow-burning, low GI source of carbohydrates

Instant Mass Pro can aid training, supporting your exercise programme to deliver results faster. It helps to ensure that you are supporting your exercise or training with a very high quality, simple source of protein and carbohydrate.

Complex carbohydrates provide the body with energy during training, replacing energy stores used up through exercise. Additional nutrients provide a significant source of vitamin D, zinc and magnesium to aid the immune and nervous systems, and the maintenance of testosterone in the blood.

Recommended Usage

Mix 136g, which is approximately five level 60ml measures, (there is a scoop in the tub) with 400ml water or skimmed milk in a shaker or blender.

We recommend consuming 1 – 2 full, or 2 – 4 half servings daily, ideally one directly after a workout. You may of course mix with more of less liquid to reach the desired consistency and taste.

How is it made?

The main ingredient in Instant Mass® PRO is whey protein derived from different methods to provide a thorough protein serving with every shake. Our Quattro® time-release protein blend contains whey protein, hydrolysed whey protein, native whey protein isolate and micellar casein, which are all derived by separating the various components from the milk.

How does it taste?

Instant Mass® PRO tastes better than ever without resorting to adding corn syrup, dextrose, sugar or salt.

Instant Mass® PRO mixes and tastes just like a milkshake, and can be enjoyed in five flavours:
Banoffee pie
Chocolate peanut butter
Chocolate perfection
Strawberries and cream
Vanilla ice cream

The science behind it

Instant Mass® PRO contains our very own Quattro® blend to provide the body and muscles with the protein to ensure the maintenance of muscle tissue is catered for. Four different types of protein provide a comprehensive time release blend. Hydrolysed whey protein is absorbed almost immediately, pure whey protein and native whey protein isolate provide fast-digesting protein, and micellar casein is proven to be digested slowest, essentially drip-feeding the muscles protein and amino acids over a long period of time, and throughout the recovery period.

Complex carbohydrates found in the whole grain oats and barley provide the body with slow-burning energy.  Zinc, magnesium, and vitamin D allow the normal function of the immune and nervous systems, and contribute to a reduction in tiredness and fatigue.

Anything else?

Available in 2.727kg tubs and 5.4kg tubs, including 20 and 40 servings.

Product is best consumed immediately once mixed. The scoop included with the product measures by volume not by weight, for precise measurements please use measuring scales.

Suitable for

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

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

For further allergy advice, please read our suitability guide.


Quattro® protein blend (milk ultra-filtered whey protein, milk protein concentrate (80% micellar casein, 20% whey), milk native whey protein, milk hydrolysed whey protein (degree of hydrolysis 30%)), peptide-bonded glutamine (derived from wheat protein), carbobiotics™ low GI carbohydrate complex (oat flour, barley flour, trehalose, fructooligosaccharide), maltodextrin, egg white protein isolate, flavourings, natural colourings (fat reduced cocoa powder (chocolate varieties only), betanin (strawberry variety only), beta carotene (banana & vanilla varieties only)), magnesium citrate,, thickener (carboxymethyl cellulose), artificial sweeteners (acesulfame k, sucralose), emulsifier (soya lecithin), ascorbic acid (vitamin c), digezyme® digestive enzyme complex (amylase, cellulase, lactase, lipase & neutral protease), tocotrienols as deltagold® (35% total tocotrienols of which 84-92% delta-tocotrienols, 8-16% gamma-tocotrienols) obtained from annatto, zinc monomethionine, lactospore® (bacillus coagulans)), sodium borate, copper aspartate, pyridoxine hydrochloride (vitamin b6), l-selenomethionine (selenium select®), chromium picolinate, bifidobacterium bifidum, lactobacillus acidophilus, lactobacillus rhamnosus, cholecalciferol.

Nutritional profile

Instant Mass Pro - Nutritional Profile

Product Label

Instant Mass PRO label

4 reviews for Instant Mass® PRO

  1. Rated 5 out of 5

    Emerson Turner

    I’ve used this now for 3 months. It’s the only product I use, it mixes easily and it’s not too sweet unlike many of these types of products. For me a weight gainer needs to supply me quality protein with a moderate amount of carbohydrates which is exactly what Instant Mass delivers. The addition of the extra minerals is great especially the Magnesium, overall it’s hard to beat.

  2. Rated 5 out of 5

    Suresh Kumar

    Hi am skinny guy just start using this product today how it goes i will let you know after 30 days


  3. Rated 5 out of 5

    Joshua L

    I have tried many weight gainers and this is by far the best one on the market and has been for along time. I used to take the original instant mass and recently tried this new pro version which has some added benefits over the old formula.

    I have the strawberry flavour which is not over sweet and goes down nicely. The protein sources are great, I always prefer casein and egg in my weight gainer for protein sources over types such as soya.

    The carbohydrate blend is superior to other cheaper brands using multidextrin and other cheap carb fillers. To put on weight you need high quality slow releasing carbohydrates in the body especially if you struggle to put on weight.

    The big main thing for me is I don’t get any gut problems with this one. I remember with other brands I used my tummy would get upset so I never bought those ones again.

    Instant mass is a staple of my weight training programme and I notice results in muscle mass along with a high calorie healthy diet along side it.

    Only improvement I could make is look into other carb sources like sweet potato, waxy maize starch, activated barley and maybe some MCT’s like coconut oil, primrose oil. Or you could try make the product more natural friendly as I like raw products with nothing nasty added as that is a major turn off.

    keep it up reflex with pushing the boundaries of nutrition 🙂

  4. Rated 5 out of 5


    I haven’t tasted a better shake than this…..ever. I bought the chocolate peanut butter flavour and it is unbelievable. I fast during the morning and only get to train
    Late in the afternoon so find this is a great shake to have after my workout if I find I haven’t hit my calories for the day. I just adjust the serving size accordingly. I would recommend this without a doubt.

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