Reflex Nutrition Instant Mass Heavyweight Mass Gainer Over 1000 Kcal | Desertcart Ireland
Reflex Nutrition Instant Mass Heavyweight - Mass Gainer - Over 1000 Kcal per Serving, 60g Protein, Creatine - High Calorie Post Workout or Before Bed Protein Shake (Choc Peanut Butter, 5.4 kg)
CLEAN TRUSTED QUALITY - No added sugars, artificial colors, or soy; Halal certified and made in an Informed Sport registered facility.
CREATINE ENHANCED STRENGTH - Built-in creatine boosts power output and accelerates muscle repair post-workout.
MASSIVE CALORIE POWERHOUSE - Fuel your gains with over 1000 kcal per serving to crush your muscle and weight goals.
PROTEIN PACKED PERFORMANCE - 60g of high-quality protein from grass-fed whey and hydrolysed sources for rapid recovery and growth.
DELICIOUS CHOC PEANUT BUTTER INDULGENCE - Savor every sip of this creamy, crave-worthy flavor that makes fueling feel like a treat.
Reflex Nutrition Instant Mass Heavyweight is a premium mass gainer delivering 1127 kcal, 60g protein, 197g carbs, creatine, and 18 essential vitamins per 300g serving. Designed for hard gainers and athletes, it supports muscle growth, recovery, and weight gain with clean, high-quality ingredients and a delicious choc peanut butter flavor.
Specifications
Product Name
HEALTH_PERSONAL_CARE
Additives
Lecithin
Allergen Information
Contains: Wheat, Soy, Egg may contain, Milk, Oat
Weight
5.4 Kilograms
Volume
5400 Millilitres
Units
5400.0 gram
Storage Instructions
In a cool, dry place
Serving Recommendation
One Scoop
Manufacturer contact
Reflex Nutrition, Sea View Way, Brighton, BN2 6NT, UK
Country of origin
United Kingdom
Brand
Reflex
Format
Powder
Age Range Description
Adult
Country of origin
United Kingdom
Serving Size
300 g, 300 g
Energy (kcal)
1127.00 kcal
Fat
9.6 g
- Saturates
3.6 g
Carbohydrate
197 g
- Sugars
15 g
Fibre
7.5 g
Protein
60 g
Have a Question? See What Others Asked
Why isnt the nutritional info shown?!
how well does this mix in an ordinary shaker? i know some are clumpy and chalky tasting, thank you
Has it got any. Bcaa,s pls
Must I work out to use this?
Reviews
4.0
All from verified purchases
J**N
Muscle building Gainer
Brilliant weight gainer for muscle building. Has a great protein profile. The quality of the product is very high and well packed. Although it has huge serving portions you can always adjust to what you need to meet your requirements.It dissolves well and tastes really good compared to a lot of others I’ve tried. It has a smooth texture after just a few shakes in a bottle and goes down nicely.
M**E
Good value and effective
Excellent product, good price.Other similar products I have tried have a sickly sweet synthetic flavour, more expensive and seemingly less effective.Nice taste that isn't overpowering or very sweet. Good consistency when mixed (I don't mix it very well or shake that much and the few clumps I get aren't at all off-putting)Despite the calories and well rounded ingredients I wouldn't think of this as a replacement and am pleased to see that it isn't marketed as such. Rather, if you are training or just generally busy with stuff this feels like an additional surplus/boost to improve your growth and overall health. I am not a big fan of protein powders, meal replacements, pre-workout etc and this feels like it sits somewhere nicely inbeteeen those.I would highly recommend this product to anyone that wants a well rounded powder to supplement their diet.
J**S
Please read review. Nice taste and mix but questionable ingredients
PLEASE READso as a weight gainer shake , mixability and taste wise I think it's great.Unfortunately the main ingredient is maltodextrin . Which they say is a carbohydrate source , but in fact your body sees this more like a sugar and this spikes your blood sugar way more than table sugar. In fact almost double.This item for that reason will help you gain weight , but I doubt much of it would be muscle.I've given 4 stars because it's not bad , but if you are informed on ingredients you will understand maltodextrin is one you are best to avoid.Dr Berg does an interesting video on it if anyone would like a dr's opinion.
A**E
Tast good
Taste good and mixis easy
S**Y
Ffs.
Bought this as I couldn't get my normal order. This shake is awful! Got the chocolate flavour, it does not mix in a shaker. There was a good half a scoop clumped in the bottom. I put it in the blender and obviously it sorted it. Taste test time. Wish I bloody hadn't. It tastes somewhere between plastic and petrol. DO NOT WASTE YOUR MONEY.I will deffinetly pay more attention as to when I'm running low on my usual stuff.Fyi - MUSCLETECH MASS TECH EXTREME 2000 is the one to go for. Mixes perfectly and tastes amazing. 10/10
G**
Tastes bad but effective
Tastes awful, makes you very bloated, however should be good in the long run with 1000 calories and 60g of protein, just do not drink before a run
J**
Impressed. Notice results
This is a great product. Has good flavour without to much sugar. Mixes well and It disgests really well. Can have with milk and i have to say the flavour is really nice. Water is just as good to definatly worth the price.Ive been taking for few months and have noticed a difference. Ordering the 5.2kg one will get most for your money.
T**E
Great buy
Husband always buys this . Lovely flavour he has some horrid ones love it’s next day also
Common Questions
Trustpilot
TrustScore 4.5 | 7,300+ reviews
Ali H.
Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.
1 day ago
Meera L.
Smooth transaction and product arrived in perfect condition.
For a full serving mix 300 g (approximately five heaped 60ml measures with 700 ml water in a suitable shaker cup or blender, mix until smooth. This product is intended for adults performing high-intensity exercise. When just starting with this product, you may find it beneficial to begin with half the quantity before slowly increasing to the full serving in order to make it fit into your personal calorie plan. Consume Instant Mass® Heavyweight between meals to maintain a positive nitrogen balance, or 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. 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.
Safety Warning
This product is a food supplement and should be used in conjunction with food as part of a varied and balanced diet and healthy lifestyle, not as a substitute for such. Recommended consumption is one 300 g serving per day. Do not exceed the stated recommended daily dose. This product is not intended for use by persons under the age of 18. Keep out of reach of young children. The scoop included with this 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. This product has been manifactured in a facility which is routinely tested for banned substances. Protein contributes to the growth and maintenance of muscle mass. Creatine increases physical performance in successive bursts of short-term, high intensity exercise. The beneficial effect is obtained with a daily intake of 3 g of creatine.
Legal Disclaimer
Dietary supplements are not a substitute for a balanced and diversified diet.
Box Contains
1 x Instant Mass Heavyweight - 5.4kg - Chocolate Peanut Butter
Manufacturer Contact Information
Reflex Nutrition, Sea View Way, Brighton, BN2 6NT, UK
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The quality of the product is very high and well packed. Although it has huge serving portions you can always adjust to what you need to meet your requirements.It dissolves well and tastes really good compared to a lot of others I’ve tried. It has a smooth texture after just a few shakes in a bottle and goes down nicely."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"M***E"},"datePublished":"3 April 2023","name":"Good value and effective","reviewBody":"Excellent product, good price.Other similar products I have tried have a sickly sweet synthetic flavour, more expensive and seemingly less effective.Nice taste that isn't overpowering or very sweet. Good consistency when mixed (I don't mix it very well or shake that much and the few clumps I get aren't at all off-putting)Despite the calories and well rounded ingredients I wouldn't think of this as a replacement and am pleased to see that it isn't marketed as such. Rather, if you are training or just generally busy with stuff this feels like an additional surplus/boost to improve your growth and overall health. I am not a big fan of protein powders, meal replacements, pre-workout etc and this feels like it sits somewhere nicely inbeteeen those.I would highly recommend this product to anyone that wants a well rounded powder to supplement their diet."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"4.0"},"author":{"@type":"Person","name":"J***S"},"datePublished":"7 May 2025","name":"Please read review. Nice taste and mix but questionable ingredients","reviewBody":"PLEASE READso as a weight gainer shake , mixability and taste wise I think it's great.Unfortunately the main ingredient is maltodextrin . Which they say is a carbohydrate source , but in fact your body sees this more like a sugar and this spikes your blood sugar way more than table sugar. In fact almost double.This item for that reason will help you gain weight , but I doubt much of it would be muscle.I've given 4 stars because it's not bad , but if you are informed on ingredients you will understand maltodextrin is one you are best to avoid.Dr Berg does an interesting video on it if anyone would like a dr's opinion."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"A***E"},"datePublished":"13 May 2025","name":"Tast good","reviewBody":"Taste good and mixis easy"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"1.0"},"author":{"@type":"Person","name":"S***Y"},"datePublished":"26 April 2025","name":"Ffs.","reviewBody":"Bought this as I couldn't get my normal order. This shake is awful! Got the chocolate flavour, it does not mix in a shaker. There was a good half a scoop clumped in the bottom. I put it in the blender and obviously it sorted it. Taste test time. Wish I bloody hadn't. It tastes somewhere between plastic and petrol. DO NOT WASTE YOUR MONEY.I will deffinetly pay more attention as to when I'm running low on my usual stuff.Fyi - MUSCLETECH MASS TECH EXTREME 2000 is the one to go for. Mixes perfectly and tastes amazing. 10/10"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"3.0"},"author":{"@type":"Person","name":"G*** "},"datePublished":"18 April 2025","name":"Tastes bad but effective","reviewBody":"Tastes awful, makes you very bloated, however should be good in the long run with 1000 calories and 60g of protein, just do not drink before a run"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"J*** "},"datePublished":"23 June 2024","name":"Impressed. Notice results","reviewBody":"This is a great product. Has good flavour without to much sugar. Mixes well and It disgests really well. Can have with milk and i have to say the flavour is really nice. Water is just as good to definatly worth the price.Ive been taking for few months and have noticed a difference. Ordering the 5.2kg one will get most for your money."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"T***E"},"datePublished":"26 April 2025","name":"Great buy","reviewBody":"Husband always buys this . Lovely flavour he has some horrid ones love it’s next day also"}],"aggregateRating":{"@type":"AggregateRating","ratingValue":4.125,"bestRating":5,"ratingCount":8}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Why isnt the nutritional info shown?!","acceptedAnswer":{"@type":"Answer","text":"The company sent me only half my order on multiple occasions and the wrong flavour. The fact that the nutritional info isnton there is no surprise"}},{"@type":"Question","name":"how well does this mix in an ordinary shaker? i know some are clumpy and chalky tasting, thank you","acceptedAnswer":{"@type":"Answer","text":"Hi I would recommend blend for 7 seconds if that.\nIf you have a good shaker and give it a good shake it will be just as smooth great mix chocolate for me taste wonderful"}},{"@type":"Question","name":"Has it got any. Bcaa,s pls","acceptedAnswer":{"@type":"Answer","text":"Finished it a long time ago so don’t have the package. But i checked the photos and googled the BCAA’s and based on this, the product doesn’t have any of the 9 essential amino acids aka BCAA. So it’s a No and you’ll have to buy it separately."}},{"@type":"Question","name":"Must I work out to use this?","acceptedAnswer":{"@type":"Answer","text":"I won't buy this again as found the taste not to my liking at all as for working out I would as I belive this will help you gain weight but mostly on the stomach if you don't work out"}}]}]}
