USN Muscle Fuel Anabolic Review and Side Effects

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Andy Williams
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If you’re based in the UK and are looking for an all-in-one protein shake to gain mass, then you’ve probably come across USN Muscle Fuel Anabolic. I first took this stuff about 12 years ago, I was chuffed with the results I got.

A lot more mass gainers have hit the market since then, so I thought I’d order a tub and do a full USN Muscle Fuel Anabolic review to see if it’s still as potent and effective as it was a decade ago.

In addition to examining its mass-building effectiveness, I’ll also be rating USN All-In-One Muscle Fuel Anabolic on taste to see if it’s the best tasting mass gainer. After that, I’ll discuss mixability, when to take it, and potential side effects.

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USN Muscle Fuel Anabolic
A front view of USN Muscle Fuel Anabolic
Taste: 9.5/10
Mixability: 9.6/10
Ingredient Quality: 9.3/10
Mass-Building Potential: 9.5/10
Overall Rating: 9.5/10
  • Contains 550 muscle-building calories per 150g serving
  • Supports post-workout recovery and glycogen resynthesis with 77g of varied carbs
  • Maximises muscle growth with 54g of quality protein
  • Includes 5g of creatine monohydrate for enhanced strength
  • Formulated with HMB to minimise muscle protein breakdown
  • Comes with digestive enzymes for enhanced nutrient absorption
  • Tastes great and mixes really easily
  • Quite expensive, especially if you take two servings a day
  • Contains soy protein, which isn’t to everyone’s liking (whey is still the primary protein source)

USN Muscle Fuel Anabolic Nutritional Information

The scoop size for USN Muscle Fuel Anabolic

In addition to containing a solid blend of protein and carbs, USN Anabolic Muscle Fuel is also formulated with lots of extra ingredients (and in good dosages), like creatine, HMB, beta alanine, and glutamine, just to name a few.

What I like about this all in one USN Muscle Fuel Anabolic supplement is that, while on the expensive side, it does remove the need to buy other supplements like creatine, glutamine, and HMB, which will save you money overall.

Plus, taking multiple proven supplements alongside your mass-gaining shake means that you can consume them at the optimal time—right after your workout. No longer will you need to remember to add various powders to your protein shake or mass gainer; Muscle Fuel Anabolic has done the organisation work for you in this sense.

Per 3-scoop serving, which is equal to 150g of powder, USN Muscle Fuel Anabolic All-In-One contains:

The USN Muscle Fuel Anabolic nutrition facts
  • 550 calories
  • 77g of carbs
  • 20g of sugar
  • 3.2g of fibre
  • 54g of protein
  • 2.9g of fat
  • 5g of creatine
  • 9.7g of total glutamine
  • 1.1g of HMB
  • 1.1g of beta alanine
  • 0.3g of taurine
  • 121mg of magnesium
  • 2.1mg of zinc
  • 546mg of calcium
  • A range of other vitamins and minerals
  • Tolerase® digestive enzymes

USN Muscle Fuel Anabolic Ingredients

You could write a book about all the USN Muscle Fuel Anabolic ingredients because there are so many. In this sense, it really is an all-in-one muscle mass catalyst—certainly on paper.

Later on in my USN Anabolic Muscle Fuel review, I’ll discuss what kind of results people have got from taking this supplement. But for now, let’s see how the individual ingredients can help your body build muscle.

Carb Matrix

USN All In One Muscle Fuel Anabolic contains 77g of carbohydrates per serving from maltodextrin, dextrose, and fructose, making it the ideal post-workout shake for achieving rapid muscle glycogen resynthesis.

A back view of USN Muscle Fuel Anabolic showing the side effects

The quicker you can recover after a workout, the sooner you can get growing.

While carbs like oats and rice certainly have their place, consuming low GI carbs after training could slow down overall nutrient absorption, which defeats the purpose of drinking a post-workout shake.

Muscle-building shakes are meant to spike your insulin levels in order to trigger faster nutrient uptake. This is exactly what USN All In One Muscle Fuel Anabolic does.

And yet, USN doesn’t go overboard by including a bunch of unnecessary carbs or silly amounts of sugar. Instead, we get the perfect amount of carbs for quick glycogen replenishment so that our muscles can get the fuel they need to repair and recover (and also to look full and pumped).

Protein Blend

USN Muscle Fuel Anabolic All In One contains 54g of protein from a diverse range of sources so that you can maximise hypertrophy by feeding your muscles with a variety of anabolic amino acids.

Closeup of USN Muscle Fuel Anabolic All In One

The proteins are whey concentrate, milk protein isolate, egg albumen (egg whites), calcium caseinate, rice protein, and soy isolate.

This is the order that the protein sources are listed on the back of my USN Muscle Fuel Anabolic tub, so I can only presume that whey is the main protein source, which is exactly what you want with a post-workout shake.

Yet, we also have slower digesting protein sources like calcium caseinate and milk protein (milk protein is 80% casein and 20% whey).

So yes, you do get that big muscle protein synthesis (MPS) spike from the whey. But what happens when that spike dies down?

This is where the slower-digesting proteins come in. While calcium caseinate and casein may not be as anabolic as whey, they’re more anti-catabolic because they release amino acids into your bloodstream at a slower rate but for a longer period of time.

Hypertrophy essentially comes down to stimulating MPS (anabolic) while minimising protein breakdown (anti-catabolic), which is something that USN has obviously kept in mind while formulating Muscle Fuel Anabolic.

Creatine Monohydrate

The servings per tub (40) for USN Muscle Fuel Anabolic

When it comes to mass gainers and protein powders, so many brands are really cheeky with their creatine usage.

What I mean is, that they typically include 1-3 grams so that they can advertise their gainer as containing creatine on the front of the tub. However, these brands know full well that a dosage of 5 grams is optimal for muscle growth and strength development.

Thankfully for our gains, USN includes a full 5g dose of creatine monohydrate per serving. I’m glad that they use creatine monohydrate and not the other forms, which don't have nearly as much research supporting their beneficial effects as monohydrate does.

Creatine is the ideal mass-building supplement because, in addition to boosting your 1RM strength and helping you set new PRs, it enables you to do more reps and sets, which leads to greater muscle growth.

Amino Acids

USN Muscle Fuel Anabolic 4kg and 2kg contain a variety of amino acids so that you can maximise your muscle growth and supercharge your recovery.

A front view of USN Muscle Fuel Anabolic

In addition to 10g of naturally occurring BCAAs and 9.7g of glutamic acid, there’s also 1.1g of HMB per serving. This leucine derivative helps to keep your muscles growing by keeping muscle catabolism at bay, which is why HMB is becoming increasingly popular with bodybuilders.

Then, you have 1.1g of beta alanine. Contrary to popular belief, the beta alanine tingles aren’t actually a sign that the supplement is working (though it does make for a good placebo for the gym bros!). A bit like creatine, beta alanine needs to saturate your muscles in order to boost their endurance, which can take a couple of weeks.

So while it might seem strange to have beta alanine in your protein powder/mass gainer, it’s a great bodybuilding ingredient to have in your stack, regardless of when you take it.

Next up is taurine, included at a dosage of 0.3g. While there are studies showing that taurine is effective, it’s not exactly a mass-building powerhouse in the sense that creatine and BCAAs are.

In case you’re interested, here’s a full amino acid breakdown based on the ingredient label. I’ve converted the values from milligrams to grams and rounded them up or down for ease of consumption.

  • L-Alanine: 2.2g
  • L-Arginine: 3.7g
  • L-Aspartic Acid: 5g
  • L-Cystine: 1g
  • L-Glutamic Acid: 9.7g
  • L-Glycine: 3g
  • L-Histidine: 1.3g
  • L-Isoleucine: 2.7g
  • L-Leucine: 4.6g
  • L-Lysine: 3.2g
  • L-Methionine: 0.77g
  • L-Phenylalanine: 2.6g
  • L-Proline: 2.8g
  • L-Serine: 2.5g
  • L-Threonine: 1.9g
  • L-Tryptophan: 0.6g
  • L-Tyrosine: 1.7g
  • L-Valine: 2.9g
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Vitamins and Minerals

While you might not associate mundane vitamins and minerals with slabs of muscle mass, having a healthy body gives you the proper foundation to repair and grow muscle.

A USN shaker beside a tub of All In One Muscle Fuel Anabolic by USN

USN Anabolic Muscle fuel contains biotin, folic acid, vitamin A, thiamine, vitamin B12, riboflavin, niacin, pantothenic acid, vitamin B6, Vitamin C, Vitamin D, Vitamin E, calcium, magnesium, phosphorus, and zinc.

I think that it’s a bonus to have vitamins and minerals in any kind of calorie-dense shake. After all, if you ate the equivalent calories in food, you’d be getting good nutrition.

Obviously, for a hardgainer, empty calories do have their place, and nobody takes Muscle Fuel Anabolic for the vitamins! I’m a firm believer in getting most of your vitamins and minerals from whole foods anyway.

Digestive Enzymes

To round it all off, USN All-In-One Muscle Fuel Anabolic is formulated with Tolerase® digestive enzymes so that your body can maximise the nutrients that you’re drinking.

So, not only will these enzymes help you to absorb the amino acids better, but they’ll also help you to digest the shakes easier, meaning that they won’t sit as heavy on your stomach.

USN Muscle Fuel Anabolic Taste and Mixability

A man making a shake of USN Muscle Fuel Anabolic

While ingredients are more important than taste, it doesn’t hurt to have a great-tasting shake that you can actually look forward to drinking. Obviously, taste and flavours are the most subjective part of my USN All In One Muscle Fuel Anabolic review, but I’ll try and give my honest opinion. 

Previously, I bought a USN Muscle Fuel Anabolic 4kg variety pack that consisted of chocolate, strawberry, vanilla, and cookies & cream. My favourites were chocolate and strawberry—I like the classic ice cream flavours when it comes to protein shakes—but I also thought that cookies & cream was nice, so much so that I bought another tub!

Vanilla was pleasant, but I’ve never personally been a fan of vanilla protein shakes, so I can’t really give a proper opinion here.

Overall, the flavours were really tasty—much better than average, in my opinion. Yes, some can be quite sweet, but they’re not overpowering or too intense, which definitely makes the shakes more drinkable.

A serving of USN All In One Muscle Fuel Anabolic

Also, USN is one of the only brands to offer variety packs and weight gainer samples that have more than a single serving. 

This way, you can trial each flavour for a week before deciding which you like the best (I can say from the experience of taste testing 70 mass gainers that some flavours don’t taste great at first but really start to grow on you after a few shakes).

As for mixability, USN Muscle Fuel Anabolic gets top marks. Unlike with other shakes, you don’t get loads of small clumps in the bottom of your shaker, which means no nasty surprises when you drink it.

Personally, I mix my shakes with milk as I prefer a thicker, creamier, and slightly thicker texture. But if you want to bring Muscle Fuel Anabolic to the gym with you, then you can just add some water, and it’ll mix with no problems (you definitely don’t need a blender, although you can use one).

USN Muscle Fuel Anabolic Before and After Results

There’s certainly no shortage of positive USN Muscle Fuel Anabolic reviews online. I’ve also heard a number of lads at the gym reporting good results from taking this stuff.

Before and after making a shake of USN Muscle Fuel Anabolic

When taking USN All In One Muscle Fuel Anabolic, many people report feeling stronger and having more energy in the gym, enabling them to lift heavier weights and break through plateaus. This is likely because you’re getting 5 grams of creatine per serving.

If I remember correctly, the old Muscle Fuel Anabolic formula had around 3 grams of creatine, so this ingredient upgrade should provide even better strength gains.

With 550 calories per serving, I’m not surprised that a lot of lads have put on solid amounts of mass while taking Muscle Fuel Anabolic. Creatine does make your muscles hold water and increase your weight, but the 54g of protein and quality carbs are what actually help you achieve a calorie surplus and gain size.

What some people do is take 2-3 scoops before a workout and 2-3 scoops after so that they’ve got plenty of energy and amino acids at their disposal.

While you can take this supplement any time of the day, I recommend taking it pre and/or post-workout if you want to get the best USN Muscle Fuel Anabolic before and after results possible.

How To Use USN All-In-One Muscle Fuel Anabolic

USN recommends mixing 3 heaped scoops (150g of powder) with 500 to 600 ml of water and then shaking for 30 seconds. Pretty standard stuff.

Instructions explaining how to take USN Muscle Fuel Anabolic

As I mentioned earlier in my USN All-In-One Muscle Fuel Anabolic review, I prefer to mix the powder with milk because I really enjoy the thick, creamy shakes.

Obviously, if your sweet tooth isn’t as strong as mine, then you can just mix your USN Anabolic Muscle Fuel with water, which still tastes pretty good, especially for such a high-calorie shake.

I’d say that post-workout is the best time to take Muscle Fuel Anabolic because your muscles are most receptive to amino acids and glycogen (and nutrients in general) after training.

If you want to take a more hardcore approach and bulk up quickly, then you can take one serving pre-training and another post-workout.

Personally, I’d just take 2 scoops each time if I did this because 54g of protein per shake is a lot, and you can make great gains with quite a bit less.

Of course, if you take 2 servings per day, then you’re going to burn through the tub much faster, so things could get expensive. But honestly, for the quality nutrition that this Anabolic Muscle Fuel provides, I think the price is well worth the results.

USN Muscle Fuel Anabolic Side Effects

The front of the tub showing the USN Muscle Fuel Anabolic flavours

In order to keep my USN Anabolic Muscle Fuel review completely honest and transparent, I want to talk about the potential side effects of Muscle Fuel Anabolic.

If you’re switching from regular protein shakes to this calorie-dense mass-gain formula, then you might feel a bit bloated from all of the extra protein and carbs. This will lessen as your body gets used to the formula, but it’s something to keep in mind.

Even though this supplement contains creatine, you’re very unlikely to suffer any side effects (except weight gain, if you can call that a side effect) from taking it because creatine is one of the most studied and tested bodybuilding supplements on the planet.

If you have poor lactose tolerance, then I wouldn’t actually recommend Muscle Fuel Anabolic because it uses milk proteins (such as whey and calcium caseinate) in its formula. This could cause an upset stomach for those who are lactose intolerant.

USN Anabolic Muscle Fuel FAQ

USN Muscle Fuel Anabolic is one of the most popular all-in-one gainers in the UK—and for good reason. But before you pull the trigger and get some anabolic muscle fuel for yourself, you might want to check out these FAQs to learn a bit more about the supplement and where to get it for the best price.

Does USN Muscle Fuel Anabolic Make You Fat?

No, USN Muscle Fuel Anabolic does not make you fat because fat gain is the result of an excessive calorie surplus and not one particular supplement. That said, if you drink USN All-In-One Muscle Fuel Anabolic in excess, then you could gain some unwanted body fat.

Does USN Muscle Fuel Anabolic Contains Steroids?

No, USN Muscle Fuel Anabolic doesn’t contain any steroids whatsoever. But I can see why some people might be suspicious, given that it contains anabolic in the name.

However, anabolism is actually a biochemical process that, in the context of bodybuilding, refers to the growth and repair of muscle tissue. So, anything that leads to muscle growth can be considered anabolic to some extent.

What Is The Best Time To Take USN Muscle Fuel Anabolic?

As mentioned earlier in my USN Anabolic Muscle Fuel review, the best time to take USN Muscle Fuel Anabolic is after a workout because your muscles are most receptive to amino acids, glycogen, and the other nutrients contained within Muscle Fuel Anabolic after you’ve stimulated them in the gym.

Where Can I Get USN Muscle Fuel Anabolic For The Cheapest Price In The UK?

As you might know, there are some sellers on different websites offering USN Muscle Fuel Anabolic at a price that seems good to be true. And as I found out the hard way, these prices usually are too good to be true.

If you want to avoid cheap and potentially dangerous knock-offs that could cause you more harm than good, make sure to click the link below to get the best UK price on USN Muscle Fuel Anabolic.

USN Muscle Fuel Anabolic vs Hyperbolic Mass

A side by side comparison of USN Muscle Fuel Anabolic vs USN Hyperbolic Mass

USN Muscle Fuel Anabolic vs Hyperbolic Mass: which one is better for building muscle?

To give a quick answer, if you’re an extreme hardgainer who has a really high calorie requirement, get USN Hyperbolic Mass.

If you want to bulk up but don’t need over 1,000 calories per shake, get Muscle Fuel Anabolic instead.

Now let’s look at the differences between USN Muscle Fuel Anabolic and USN Hyperbolic Mass in a bit more detail.

A comparison of USN Muscle Fuel Anabolic and USN Hyperbolic Mass
  • Muscle Fuel Anabolic has 550 calories per serving, whereas Hyperbolic Mass has 1148 calories. However, per 100g, the calorie amounts are very similar, so with Hyperbolic Mass, you’re basically just getting a higher carbs-to-protein ratio.
  • Muscle Fuel Anabolic has 77g of carbs per serving, while Hyperbolic Mass has 204g per shake.
  • Muscle Fuel Anabolic contains 55g of protein, while Hyperbolic Mass has 60g.
  • Muscle Fuel Anabolic uses rice protein and soy isolate in addition to whey and casein, whereas Hyperbolic Mass only uses milk-based proteins.
  • Muscle Fuel Anabolic contains HMB and beta alanine, whereas Hyperbolic Mass doesn’t have either of these ingredients.
  • Muscle Fuel Anabolic comes in either a 4kg tub or a 2kg tub, whereas Hyperbolic Mass is available in either a 6kg tub or a 2kg tub.
  • Muscle Fuel Anabolic is cheaper than Hyperbolic Mass on a per-serving basis.

You can check out my USN Hyperbolic Mass review if you’d like to learn about USN’s high-calorie formula in more detail.

Or, if you’re looking for a plant-based option, you can read my USN Wholefood Gainer review instead.

The Verdict: Is USN All-In-One Muscle Fuel Anabolic Good For Making Gains?

A tub of USN Anabolic Muscle Fuel pictured next to a scoop and shaker bottle

USN Muscle Fuel Anabolic All-In-One has been on the UK market for over a decade at this point and continues to provide great results for gym-goers of all levels.

Whether you’re looking to bulk up fast or just get your hands on a convenient post-workout shake, USN Anabolic Muscle Fuel is a great supplement to have.

By getting USN All In One Muscle Fuel Anabolic, you’ll no longer need to buy creatine or whey protein powder separately because this powerful formula is jam-packed with proven bodybuilding ingredients.

I hope that you enjoyed reading my USN Muscle Fuel Anabolic review. I always enjoy testing British supplements, and this was no exception. It ticks all the boxes and has everything that a bodybuilder—professional or aspiring—needs to build muscle.

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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.
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