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USN B4 Bomb

Name: USN B4 Bomb
Rating: 4.10 (40 reviews)

£25.49

Free Delivery When You Spend £100

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Explosive workout energy: Switch on fast and stay locked in with a clean, hard-hitting pre-workout boost.
Bigger pumps and performance: High-dose L-Citrulline Malate helps drive blood flow for powerful sessions.
Strength you can feel: Creatine Monohydrate supports power output for heavier lifts and better sets.
Push past fatigue: Beta-alanine and B-vitamins support endurance so you can go longer, harder.
Seriously tasty flavours: Enjoy crave-worthy options like Candy Pop and Hawaiian Pump.

USN B4-Bomb Extreme Pre-Workout 300g – Turn every session into your best session

Meet the pre-workout designed for lifters and athletes who demand more. USN B4-Bomb Extreme from the Hardcore Series fires up energy, focus and performance so you can walk into the gym ready to dominate. Whether you’re chasing new PBs, smashing a full-body circuit, or battling a late-night workout, this formula helps you bring intensity from the first rep to the final set.

Why B4-Bomb Extreme hits different

This punchy pre-workout combines proven performance drivers at meaningful amounts to deliver a complete training experience:

6,000 mg L-Citrulline Malate – Supports nitric oxide production for satisfying pumps and sustained performance.
3,400 mg Creatine Monohydrate – A staple for strength and power to help you move more weight, more efficiently.
2,000 mg Beta-Alanine – Helps buffer fatigue so you can squeeze out extra reps when it matters.
200 mg Natural Caffeine – Clean, reliable energy to sharpen focus without overdoing it.
Niacin, Vitamin B6 & B12 – Support normal energy-yielding metabolism to keep you in the zone.

Smart focus blend for driven training

USN enhances the core with modern nootropic support including Zynamite, Rhodiola rosea extract, and Bacowize, chosen to support mental performance and resilience under pressure—ideal for heavy days, HIIT finishers, and long sessions alike.

Who is it for?

Strength athletes and gym-goers chasing PBs and progressive overload
HIIT, CrossFit and functional training fans who want intensity without compromise
Endurance and field-sport athletes looking for reliable pre-session energy and focus

Tastes you’ll actually look forward to

Great flavour makes consistency easy. B4-Bomb Extreme comes in delicious options like Candy Pop and Hawaiian Pump (availability may vary).

Trusted performance from USN

Brand: USN Hardcore Series
Format: 300 g pre-workout powder
Barcode (EAN): 6009544929741
Launched: October 2020 formula

If you want a pre-workout that delivers pump, power, and pace in one, USN B4-Bomb Extreme is built to help you train harder and perform better—session after session.

Ingredients

Ingredients:

Per 15g serving: 54mg Niacin, 0.21mg Vitamin B6, 15µg Vitamin B12, 3400mg Creatine Monohydrate, 6000mg L-Citruline Malate, 2000mg Beta-alanine, 200mg Natural Caffeine, 150mg Bacowize, 100mg Zynamite, 100mg Rhodiola Rasea Extract, trisodium citrate, tripotassium citrate, silicon dioxide, calcium silicate, sucralose, acesulfame K, sodium chloride, and natural anhydrous caffeine.

Protein 0g g

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Fat 0g g

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Salt 0 g

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Carbs 0.5g g

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Values per serving

Please note that this information may be subject to change.
For the most accurate and up-to-date details, please refer to the product packaging.

Expiry

300g / Blue Raspberry Crush 28-02-2027

300g / Cherry Punch 28-02-2027

300g / Cola Burst 28-07-2027

Barcodes

180g / Blue Raspberry 6009544929741

180g / Cherry 6009544929727

180g / Cola Burst 6009544941873

300g / Blue Raspberry Crush 6009706094775

300g / Candy Pop 6009544959922

300g / Cherry Punch 6009706098773

300g / Cola Burst 6009544941842

300g / Hawaiian Pump 6009544962144

Ingredients

L-citrulline-DL-malate (2:1)
creatine monohydrate
beta-alanine
acidity regulators (trisodium citrate
tripotassium citrate)
anti-caking agents (calcium silicate
silicon dioxide)
flavouring
sodium chloride
natural flavour
sweeteners (acesulfame K
sucralose)
natural anhydrous caffeine
Bacowize bacopa extract (20:1) (Bacopa monnieri) (20% bacosides)
Zynamite mango extract (Mangifera indica L.) (60% mangiferin)
rhodiola rosea extract (Sedum roseum)
vitamin B3 (nicotinic acid)
polydextrose
colorant (anthocyanins)
vitamin B6 (pyridoxine HCl)
vitamin B12 (methylcobalamin). ALLERGENS: No common allergens have been added to this product. Produced in a facility that also processes milk
soy
gluten
eggs
fish
crustaceans
sulfite and nuts. Please Note: Nutritional facts and ingredients may vary slightly between flavours.

Discover

Shop The USN Collection

5 stars: 24 (60%)
4 stars: 6 (15%)
3 stars: 5 (13%)
2 stars: 0 (0%)
1 star: 5 (13%)

Great product

Great product and price. Taste nice and works quickly.

Not for the feint-hearted

Strong pre-workout , does what it is supposed to - great for explosive and endurance power - it is however, very rushy when it initially kicks in. Used in conjunction with L-carnitine. Cherry is also a good flavour.

Perfect

Keeps you going for hours , well recommended

Good boost

Nice flavour but very sweet

Used on long hikes and playing contact sports and I feel it does give a good boost.

Not too sure yet

Initially received It in a worrying condition( see picture)

Tried it for the first time and have to say the taste is way too strong for me.

When I first had it ( drank it fairly quickly to actually the taste) and minutes mater i noticed my face was really itchy and starts to get really hot.

Not sure I noticed it make a difference but will try a few more times and check back

Good product

A really good quality supplement, that mixes well with water and leaves no horrible aftertaste upon consumption. I personally find it gives me a nice boost before I exercise, with no horrible side effects before or after training and the boost hasn't affected my sleep schedule. Good value for money, comes with a measuring scoop and a easily resealable container.

Pleasant taste, works well

Enjoyable taste. Works well for me. I don't take it every day but I know when I do.

My GYm Supplements purchase, opened this new sealed ‘powdered’ supplement today to use and this i...

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Not for the feint-hearted

Strong pre-workout , does what it is supposed to - great for explosive and endurance power - it is however, very rushy when it initially kicks in. Used in conjunction with L-carnitine. Cherry is also a good flavour.

Great product

Great product and price. Taste nice and works quickly.

Keep away!

No pump, no results, no tingly sensation or anything! Complete waste of money. I'm double scooping it, going gym feeling normal and walking out thinking wheres my pump. Second USN product I brought within a short space of time and I will keep away from this brand for sure. A can of monster is better!

Not too sure yet

Initially received It in a worrying condition( see picture)

Tried it for the first time and have to say the taste is way too strong for me.

When I first had it ( drank it fairly quickly to actually the taste) and minutes mater i noticed my face was really itchy and starts to get really hot.

Not sure I noticed it make a difference but will try a few more times and check back

Not for the feint-hearted

Strong pre-workout , does what it is supposed to - great for explosive and endurance power - it is however, very rushy when it initially kicks in. Used in conjunction with L-carnitine. Cherry is also a good flavour.

Perfect

Keeps you going for hours , well recommended

Pleasant taste, works well

Enjoyable taste. Works well for me. I don't take it every day but I know when I do.

Great product

Great product and price. Taste nice and works quickly.

Works

Definitely gives the boost I need morning or night,

The flavours not too bad either 👍

Good product

Good product instant focus .. at least for me .. nice taste would recommend this to any gym user or any one wishing for focus and extra push in whatever you do .. try this it's good ..

Great taste but at a cost!

I regularly buy this particular pre-workout purely because of the taste.

Having tried a number of pre-workouts now, this is by far my favourite, the only downside being the cost. I tend to try only to buy when on offer (unless i've run out entirely).

It also seems the Blue Raspberry flavour is always out of stock on the larger tub, which i'd rather be buying, because the small tubs don't last very long!

Overall:

Taste 8.5/10

Value for Money 5/10

Keep away!

No pump, no results, no tingly sensation or anything! Complete waste of money. I'm double scooping it, going gym feeling normal and walking out thinking wheres my pump. Second USN product I brought within a short space of time and I will keep away from this brand for sure. A can of monster is better!

😊

Perfect thanks

Keep away!

No pump, no results, no tingly sensation or anything! Complete waste of money. I'm double scooping it, going gym feeling normal and walking out thinking wheres my pump. Second USN product I brought within a short space of time and I will keep away from this brand for sure. A can of monster is better!

Pleasant taste, works well

Enjoyable taste. Works well for me. I don't take it every day but I know when I do.

Perfect

Keeps you going for hours , well recommended

I literally swear by this mess of a drink

I don't know what's in it. It doesn't taste at all like cherry. But all I know is it powers my workouts something WHACKY and I will continue to buy it until it's discontinued 😂

😊

Perfect thanks

Keep away!

No pump, no results, no tingly sensation or anything! Complete waste of money. I'm double scooping it, going gym feeling normal and walking out thinking wheres my pump. Second USN product I brought within a short space of time and I will keep away from this brand for sure. A can of monster is better!

😊

Perfect

😊

Perfect thanks

Great taste but at a cost!

I regularly buy this particular pre-workout purely because of the taste.

Having tried a number of pre-workouts now, this is by far my favourite, the only downside being the cost. I tend to try only to buy when on offer (unless i've run out entirely).

It also seems the Blue Raspberry flavour is always out of stock on the larger tub, which i'd rather be buying, because the small tubs don't last very long!

Overall:

Taste 8.5/10

Value for Money 5/10

Great taste but at a cost!

I regularly buy this particular pre-workout purely because of the taste.

Having tried a number of pre-workouts now, this is by far my favourite, the only downside being the cost. I tend to try only to buy when on offer (unless i've run out entirely).

It also seems the Blue Raspberry flavour is always out of stock on the larger tub, which i'd rather be buying, because the small tubs don't last very long!

Overall:

Taste 8.5/10

Value for Money 5/10

😊

Perfect thanks

Not for the feint-hearted

Strong pre-workout , does what it is supposed to - great for explosive and endurance power - it is however, very rushy when it initially kicks in. Used in conjunction with L-carnitine. Cherry is also a good flavour.