Strom Sports StimuMax Black is a powerful stimulant pre workout powder that fuels big energy and focus, because citrulline malate and caffeine power your session. Born from a UK founded brand that values clarity, it uses a straightforward formula with beta alanine for longer efforts and N Acetyl L Tyrosine to help you stay alert. The result is a pre workout powder that helps you train harder and longer, and stay focused from warm up to finish.

Benefits & Features:

• Boosts energy for intense training sessions.
• Supports longer endurance with beta alanine, helping you push through fatigue and maintain effort through tougher sets
• Enhances mental focus with N Acetyl L Tyrosine and caffeine for sharper decision making under pressure
• Clear ingredient list, vegan friendly and produced in a UK ISO 9001 facility, so you can trust exactly what’s in your pre workout supplement powder during every tough workout session
• No proprietary blends means you know every ingredient and dose you’re taking

Within Strom’s range of sports nutrition supplements, StimuMax Black stands out for its transparent, no blend formula. It’s manufactured in the UK at an ISO 9001 facility in Shrewsbury, using vegan friendly ingredients and allergen controls, as part of a broader range including probiotics for weight loss. The standout ingredients, Citrulline Malate and Beta Alanine, work together to support performance and endurance, while N Acetyl L Tyrosine and caffeine help you stay mentally sharp during demanding sessions. This approach, quickly and easily, mirrors Strom's commitment to quality you can feel in every rep. It’s not complicated, simply effective.

Citrulline Malate (6000mg), Beta Alanine (3200mg), NAC-L-Tyrosine (1000mg), Caffeine (250mg), Juglans Whole Fruit (Walnut) (200mg), Kigelia africana extract (200mg), Citric Acid, Sweetener (Sucralose), Flavouring, Colouring, Silicon Dioxide.

• GTIN: 5056371005804
• Manufacturer: Strom Sports
• Size: Lemon Pineapple
• Categories: Strom Sports
• 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.

Mix 1 scoop (12g) with 200-300ml of water and consume 20 minutes prior to workout. DO NOT EXCEED 2 SERVINGS IN 24 HOURS. Store in a cool, dry place, away from direct sunlight and moisture. Keep out of reach of children. If you are pregnant, breastfeeding, taking any prescribed medication or have any medical condition, please consult a healthcare professional before taking any supplements.

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

Citrulline malate is a nonessential amino acid derivative that helps support nitric oxide production and blood flow to muscles during workouts. This form helps boost energy and endurance during tough training sessions. This formula also includes beta-alanine and caffeine, which help endurance and alertness during workouts.

What Does Citrulline Malate Do?

Citrulline malate helps with better aerobic and anaerobic performance and may help delay fatigue by boosting blood flow and nutrient delivery. This aligns with research showing gains in high-intensity workouts and endurance sessions.

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

Strom Sports is our go‑to partner for this high octane pre‑workout since its manufacturing rests in a UK site certified to ISO 9001 standards, underpinning dependable quality control and traceability through production. This focus on precision and process aligns with Welzo's commitment to thorough quality and safety in every supplement we offer.

This brand's transparent formulation approach, including full disclosure of active ingredients and their dosages, supports clear evaluation by our team (and by customers alike). Our assessment emphasises Strom Sports’ manufacturing excellence, continued adherence to quality practices, and its positioning within a professional, sport‑focused category that resonates with athletes seeking energetic performance support. This is complemented by independent validation through our internal review process, with Welzo's healthcare professionals and our quality standards team overseeing every step in the supply chain.

Welzo’s partnership with Strom Sports reflects our belief in reliability, traceability and product integrity. You can trust that this brand has been chosen for its responsible manufacturing and suitability for this type of supplement, backed by our expert evaluation and ongoing oversight. Welzo's healthcare professionals and how we verify ingredient quality.