XL Nutrition Xtra Mass Gainer Review

A picture of Best Mass Gainer UK founder, personal trainer Andy Williams
Written By
Andy Williams
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XL Nutrition Xtra Mass is a high-calorie weight gainer designed for those who need more calories, carbs, and protein than they can realistically get from their regular whole-food meals.

With a massive 1,000 calories per serving, including 50g of protein and 172g of carbs, this XL Nutrition Mass Gainer certainly looks good on paper. But does it actually work?

I decided to buy a big 5.2kg bag to find out. In my XL Nutrition Xtra Mass review, I’ll give my honest opinion on the taste, mixability, digestibility and, of course, the mass-building effectiveness of this high-calorie British weight gainer.

ideal for bulking
XL Nutrition Xtra Mass Gainer
A front view of XL Nutrition Xtra Mass
Taste: 9.6/10
Mixability: 9.3/10
Ingredient Quality: 9.6/10
Mass-Building Potential: 9.7/10
Overall Rating: 9.6/10
  • Triggers weight gain with 1,000 quality calories per serving
  • Contains 172g of weight-gaining carbs from oats, waxy maize starch, and maltodextrin
  • Supports muscle growth and repair with 50g of protein
  • Includes 13.1g of glutamine and 8.9g of BCAAs for faster muscle recovery and less soreness
  • Only around 10% of the carbs come from sugar
  • Mixes excellently and tastes fantastic
  • Only has 2.5g of creatine (3-5g would have been ideal)

XL Nutrition Xtra Mass Gainer Ingredients

XL Nutrition Xtra Mass has really solid macros and some enticing added extras that you don’t usually get with gainers this cheap. Maybe that’s why it’s called Xtra Mass?

The nutrition facts for XL Nutrition Xtra Mass

Per 260g serving (it says 4 scoops on the product page and 3 scops on the back of the bag, so you might want to weigh your powder), you get 1,000 calories and all these nutrients:

  • 172g of carbs
  • 50g of protein
  • 11.4g of fat
  • 18.7g of sugar
  • 4.7g of fibre
  • 5.2g of MCT powder
  • 8.9g of BCAAs
  • 13.1g of glutamine
  • 2.5g of creatine

With ingredients like these, you’d think that Xtra Mass would have a premium price tag, but it’s actually very affordable, which is great if you want to gain size without spending a fortune.

Let’s unpack these ingredients to take a closer look at their nutritional composition and to see precisely how they can benefit your body.

Slow and Fast Release Carbohydrates

The ingredient label for XL Nutrition Xtra Mass

This Xl Nutrition weight gainer boasts a 172g blend of fast-acting and slow-release carbohydrates to give your muscles both rapid glycogen replenishment and steady, continuous energy so that you can power through your workouts and achieve a calorie surplus, helping you to gain more muscle mass.  

The carb blend consists of ultra-fine oats, as well as waxy maize starch and maltodextrin.

These 3 classic carbs are easy to consume in the context of a mass gainer and have excellent mixability, allowing you to enjoy lump-free shakes every time (more on the taste and mixing in a minute).

As this XL Nutrition mass gainer contains carbohydrates with differing absorption speeds, you’re much less likely to feel lethargic and overly full because you won’t get one sudden energy rush followed by a big crash, enabling you to feel more focused and naturally energetic.

Protein Blend

The scoop size from XL Nutrition Xtra Mass

As I noted earlier in my XL Nutrition Xtra Mass review, this high-calorie weight gainer isn’t short on protein or amino acids. With a whopping 50g of protein per serving, this nutrient-dense shake has plenty of muscle fuel for a bodybuilder to pack on mass.

The protein blend consists of whey, which digests rapidly, and soy isolate, which digests more slowly.

While some people don’t like soy protein, whey is the main protein source. Plus, with so many BCAAs, the protein used in Xtra Mass is naturally high-quality and most certainly anabolic, meaning that it contains all of the amino acids that you need to gain weight and muscle mass.

As with the carbohydrates, having a blend of proteins enables you to take advantage of their differing absorption speeds and receive a more consistent supply of amino acids as a result. Ultimately, this steady supply of amino acids provided by Xtra Mass means that you’ll spend less time in a catabolic state and, therefore, make better gains.

BCAAs and Glutamine

Back view of XL Nutrition Xtra Mass

Whereas most supplement brands keep their costs down by only including basic ingredients (so they can impress you with their advertising and product packing), XL Nutrition has gone a step further by formulating Extra Mass with 8.9g of BCAAs and 13.1g of glutamine.

What this means for you and me is faster muscle recovery and less soreness, helping you to repair muscle tissue faster and thus stimulate more rapid hypertrophy.

Obviously, with glutamine levels like this, you’ll be able to save some cash because you won’t need a glutamine supplement while you’re taking XL Nutrition Xtra Mass.


If there’s one area where Xtra Mass falls a bit short, it’s the creatine content.

While 2.5g is still better than the 1g that many other brands cheekily include in their mass gainer, it falls slightly short of the optimal 3-5g daily dose.

Of course, there’s a quick and cheap fix to this; you can simply take a couple of extra grams of creatine each day to make up for the shortfall.

Overall, considering that the rest of the ingredients are solid, I won’t hold the slight lack of creatine against Xtra Mass.

amazing taste
A shaker bottle next to the bag for my XL Nutrition Xtra Mass review
XL Nutrition Xtra mass

XL Nutrition Xtra Mass Gainer Taste

Look at the taste reviews for your average weight gainer; I can guarantee that at least half of them will contain words and phrases like “disgusting”, “horrible”, or “the worst I’ve ever had”.

A shake of XL Nutrition Xtra Mass Gainer 5.2kg

But if you read the XL Nutrition Xtra Mass Gainer reviews, you’ll see that this isn’t the case at all. In fact, the opposite is true; British buyers absolutely love the taste!

And you know what? I have to agree with them, the taste is fantastic—and I rarely use that word when discussing mass gainers, let alone gainers with 1,000 calories.

You see, the shakes taste very natural, which is exactly what I’m looking for. They have enough flavour and sweetness to be enjoyable, but they’re not in any way artificial or overpowering.

I bought a 5.2kg bag of the chocolate flavour—it tastes like a chocolate milkshake when you mix it with milk—but I’ve also heard good things about the strawberry and vanilla flavours as well.

I tend to buy mostly chocolate so that I have a basis for comparison with the other gainers on the market. So far, I’ve taste-tested about 65 different weight gainers, and I have to say, this XL Nutrition mass gainer is probably in the top 5 in terms of taste.

XL Nutrition Xtra Mass Gainer Mixability

A person making an XL Nutrition Weight Gainer shake

Even though this XL Nutrition weight gainer is loaded with high doses of quality mass-building ingredients, it still mixes really well with either milk or water. I use 260g of powder and 600 ml of liquid.

Unlike lower-quality gainers, you don’t get a bunch of unmixed powder when you make your Xtra Mass shake, which makes the world of difference in terms of drinkability.

There’s nothing worse than having to hold your nose and gulp down a chalky, cement-like shake when you’re bulking.

I can safely say that you won’t be doing that when you drink XL Nutrition Xtra Mass. These shakes are so easy to mix and the consistency is perfect; thicker than a protein shake for sure, but far from sludge.

I also like that Xtra Mass—despite its 1,000-calorie formula—doesn’t sit heavy on your stomach or make you feel bloated like other weight gainers. While it does fill you up quite a bit, you don’t feel lethargic or sick from all the carbs and calories.

XL Nutrition Xtra Mass Gainer Effectiveness and Results

XL Nutrition Xtra Mass Gainer is very popular in the UK among those wanting to put on weight—and for good reason. This 5-star gainer has accumulated hundreds of positive reviews from British buyers, many of whom report excellent weight gain and increases in muscle mass in a short space of time.

Closeup of the supplement facts for XL Nutrition Xtra Mass

While this supplement won’t make you huge overnight, it will help you to gain weight in a healthy, sustainable way.

Depending on your current weight, you could find yourself putting on a few pounds in the first couple of weeks. 

This isn’t actually that surprising considering the calorie-dense formula contained within Xtra Mass. Not too many high-calorie gainers have such potent, growth-provoking ingredients, along with extras like glutamine for faster recovery.

Obviously, for the best results, you need to drink your Xtra Mass shakes on a regular basis, ideally every day. While you might not see the point of drinking Xtra Mass on a rest day, this is actually a prime recovery time for your muscles, meaning that they can actually make great use of those 1000 calories.

Related Review: Freak Mass Gainer Review

1000 clean calories
A shake of XL Nutrition Xtra Mass Gainer 5.2kg
XL Nutrition Xtra Mass

XL Nutrition Xtra Mass Gainer Price

I think I paid about 35 quid for a big 5.2kg bag of Xtra Mass, which is honestly ridiculous value for money when you look at what some of the big-name brands are charging these days.

Side view of an XL Nutrition mass gainer

In the past, I’ve paid the same price for a 2kg tub that wasn’t even as good as Xtra Mass.

You see, XL Nutrition is an English supplement company based in East Yorkshire, so they’re not one of these international brands that spend more money on marketing than on manufacturing.

As a result, you’re getting a top-quality product at a really fair price. It’s way cheaper than the likes of Boditronics Mass Attack Heavyweight and others.

If you want to stock up on Xtra Mass, you can actually buy 2-3 bags at a discounted multi-buy price, which gets you an extra 10% off the already rock-bottom price.

XL Nutrition Xtra Mass vs XL Nutrition Xtra Protein & Carbs

A comparison of XL Nutrition Xtra Mass vs XL Nutrition Protein and Carbs

XL Nutrition Xtra Mass vs XL Nutrition Xtra Protein & Carbs, which is right for you?

Honestly, you can’t go wrong with either because they both contain quality ingredients for gaining size. Still, there are some big differences between them that are worth noting.

  • Xtra Mass has 1,000 calories per serving, whereas Xtra Protein & Carbs only has 386, meaning that Xtra Mass is better for hardgainers or those with higher calorie requirements.
  • Xtra Mass is less protein-dense than Xtra Protein & Carbs, making the latter better for lean bulking.
  • Xtra Mass has 2.5g of creatine, while Xtra Protein & Carbs contains 5g.
  • Xtra Mass has 13.1g of glutamine, whereas Xtra Protein & Carbs has 7g.
  • Xtra Mass uses whey concentrate and soy isolate, whereas Xtra Protein and Carbs uses whey concentrate and whey isolate.
  • Xtra Mass is quite a bit cheaper than Xtra Protein & Carbs.
  • Xtra Mass has fewer servings per bag than Xtra Protein & Carbs but more nutrition per serving.

You can check out my full XL Nutrition Xtra Protein & Carbs review if you’d like to learn more. 

A comparison of XL Nutrition Protein and Carbs vs XL Nutrition Xtra Mass

But essentially, it boils down to this: go with Xtra Mass if you have a higher calorie requirement, or go with Xtra Protein & Carbs if you’re lean bulking or are looking for more of a meal replacement.

To see some other affordable options, you can read my Serious Gainz Protein Powder review or my Matrix Monster Calories review. These articles go over two other popular UK supplements for gaining weight.

The Verdict: Is This XL Nutrition Mass Gainer a Good Addition To Your Bulking Regime?

A shaker bottle next to the bag for my XL Nutrition Xtra Mass review

If you want to gain mass on a budget without compromising on quality, then I definitely recommend picking up a bag or two of XL Nutrition Xtra Mass.

With 1,000 calories, 172g of carbs, and 50g of protein—in addition to 8.9g of BCAAs and 13.1g of glutamine—this weight gainer has a pure yet powerful formula that will help even the hardest of hardgainers put on mass.

While I would have preferred slightly more creatinine per serving, this small drawback doesn’t discount the potency of this high-calorie weight-gain formula.

Overall, my XL Nutrition Xtra Mass review is extremely positive. I’ve really enjoyed testing and using this gainer for the past couple of weeks, and I’m sure you will too if you’re looking to bulk up.

great uk price
A person making an XL Nutrition Weight Gainer shake
XL Nutrition Xtra Mass
A picture of Best Mass Gainer UK founder, personal trainer Andy Williams
Andy Williams
Andy Williams is a UK-based personal trainer and bodybuilder who coaches gym-goers of all levels using proven evidence-based techniques in strength training, nutrition, and supplementation. He’s tested over 70 different mass gainers for their ingredient quality and muscle-building effectiveness and regularly shares his findings in his mass gainer reviews.
the logo for Best Mass Gainer UK showing a tub of weight gainer protein powder
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