USN B4 Bomb is a pre workout powder that uses L-Citrulline Malate to boost energy and endurance, helping you push through tough sessions. USN carries a long standing heritage in sports nutrition supplements, and it shows in every batch you trust.

Benefits & Features:

• Increases workout energy for longer sessions quickly and reliably.
• Supports stronger power output and lean muscle gains through creatine monohydrate and citrulline malate synergy, which keeps you driven.
• Keeps focus sharp through Bacowize Bacopa Monnieri and Zynamite mango extract, [you know] helping you stay dialled in from warm up to final whistle.
• Experience delayed fatigue and extended endurance with beta alanine and caffeine working together, so you can push harder for longer while staying mentally engaged throughout the session.
• Rhodiola rosea supports reduced perceived exertion, helping you feel capable of more during long workouts.

USN B4 Bomb sits in USN's well established line of sports nutrition supplements designed for serious athletes who want real results, and the formula spotlights branded extracts such as Bacowize Bacopa Monnieri and Zynamite mango extract chosen for consistency and potency. L-Citrulline Malate and Creatine Monohydrate drive performance gains, while Beta-Alanine and caffeine help you train longer. Rhodiola Rosea adds calm focus, and the blend sits alongside the muscle gainer protein powder range that athletes trust for reliable results.

L-citrulline, D-aspartic acid, Beta-alanine, Creatine monohydrate, Acids (Citric acid, Malic acid), Anti-caking agents (Silicon dioxide, Calcium silicate), Acidity regulator (Dipotassium phosphate), Flavouring, N-acetyl-L-tyrosine, Natural anhydrous caffeine, Zynamite? (Mango extract from leaves of Mangifera indica (60% mangiferin), Stabiliser (Potassium chloride), Sweeteners (Acesulfame K, Sucralose), AstraGin? (Extracts from roots of Panax ginseng and Astragalus membranaceous), Thickener (Polydextrose), EnXtra? (Extract from roots of Alpinia galanga), Nicotinic acid, Colour (Brilliant blue FCF), Riboflavin, Pyridoxine HCl, Methyl cobalamin hydrate, D-biotin. Allergens: No common allergens have been added.

• GTIN: 6009544941842
• Manufacturer: USN
• Size: Cola Burst
• Categories: Bodybuilding SupplementsCHECKOUT UPSELLNew ArrivalsNew In Supplements & VitaminsSports Supplements
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

To maximize your nutrition, consume this 2-calorie serving which provides 0.4g of carbohydrates (0g sugars) and 0.24g of salt. For best results, incorporate into your balanced diet. Energy content: 7 kJ / 2 kcal per serving.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Caffeine

Caffeine is a core nervous-system stimulant that helps alertness and mental focus during physical activity. This variant is natural caffeine sourced from green coffee beans, providing a dependable energy boost for workouts.

It’s used in sports nutrition to boost wakefulness and rapid responses, with sourcing from branded extracts showing standardisation.

What Does Caffeine Do?

Caffeine helps sustain alertness, reaction time, and perceived energy during exercise. It’s involved in energy metabolism and can aid endurance performance when taken before activity, in line with NHS and EFSA guidance. Dr. Grgic of the University of Zagreb found that caffeine can boost workout performance (which is noted in studies).

This product isn't meant to diagnose, treat, cure, or prevent any disease.

SUITABLE FOR VEGETARIANS AND VEGANS

For optimal use:
- Always check ingredient list before consumption
- Store in a cool, dry place
- Follow recommended serving portions
- Keep sealed when not in use
- Consume within indicated timeframe
- Notify manufacturer of any adverse reactions
- If pregnant or nursing, consult healthcare provider
- Keep away from direct sunlight
- Monitor individual tolerance
- Maintain proper storage conditions

Carbohydrates:0.4g ,Salt:0.2g

USN is a widely recognised sports nutrition label with a long-running track record in delivering performance-driven products, which is why USN feels like a reliable ally for Welzo and you, our customers. The B4 Bomb formula uses branded, standardised ingredients such as Bacowize and Zynamite, mirroring USN’s commitment to openness and quality in sourcing and makeup. This label has earned a reputation for broad availability through major retailers, emphasising its manufacturing reliability and market robustness.

Welzo’s medical team evaluated USN against our stringent criteria for quality and safety, confirming alignment with our expectations for reputable manufacturing practices and consistency across batches, while ensuring the product fits a high-performance pre-workout profile. We emphasise this label’s readiness to deliver potent, well-supported formulas for athletic performance, backed by our internal assessment framework. For extra assurance, USN’s approach aligns with our ingredient quality and purity standards, which we reference when finalising supplier partnerships. This collaboration is strengthened by our commitment to UK regulatory compliance and local market know‑how. Welzo's healthcare professionals and our ingredient quality and purity standards.