C4 Ultimate Powder is a strong stimulant pre-workout that powers intense sessions with lasting energy, sharper focus and mighty pumps. Star ingredients like L-Citrulline support blood flow and pumps, while Beta-Alanine helps you push through tougher reps, and Caffeine powers focus, weaving together a triple threat for serious sessions. This formula is fully disclosed and backed by Cellucor's long standing commitment to quality, making it a trusted pick for athletes.

Benefits & Features:

• Explosive energy powers long sessions.
• The star ingredients work in synergy to boost performance, with citrulline promoting pumps and blood flow, beta alanine delaying fatigue, caffeine sharpening focus, and branded ingredients aiding absorption for steady energy.
• Designed for daily use by serious athletes seeking reliable energy and mental clarity during tough workouts.
• Fully disclosed label helps you know exactly what you're taking and how it supports performance.
• Best pre workout powder for serious athletes who want consistent energy, focus, and power come from a trusted formula.

Cellucor has earned a strong reputation for transparency and quality that endurance athletes rely on. C4 Ultimate uses trademarked ingredients like CarnoSyn beta alanine, Betapower hydration support, AstraGin and EnXtra to boost absorption, focus and stamina. Some versions even include cellucor creatine to support power and strength. This heritage means you’re buying into a trusted, fully disclosed formula that pairs well with energy gels for cycling on long days and races. Quality matters. Trust matters.

Vitamin B6, Vitamin B12, Potassium, Magnesium, Sodium, L-Citrulline, CarnoSyn Beta-Alanine, BetaPower Betaine, L-Tyrosine, Caffeine, Choline, CereBoost, EnXtra, AstraGin

• GTIN: 5056569900461
• Manufacturer: Cellucor
• Size: Lemon Twist / 520 grams
• Categories: Cellucor
• 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.

Take one scoop of Cellucor C4 Ultimate Pre-Workout 20-30 minutes before your workout, mixing it with 700ml of water. Do not exceed one serving per day. Store in a cool, dry place, away from direct sunlight and moisture. Keep out of reach of children. This product is intended for healthy adults aged 18 and over. Consult a healthcare professional before use if you are pregnant, nursing, taking medication, or have any medical conditions. Discontinue use and consult a doctor if you experience any adverse reactions.

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

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: Caffeine (Anhydrous)

Caffeine is a stimulant widely used to support alertness and mental focus during demanding activities.

This form is caffeine in an anhydrous state, a common, highly bioavailable source used in sports nutrition products.

What Does Caffeine Do?

Dr. Grgic of the University of Zagreb found that caffeine can enhance power, focus and exercise performance in appropriate doses, aligning with guidance on stimulant use for activity-related benefits.

This information helps explain how caffeine supports sustained mental and physical engagement during workouts, with effects linked to central nervous system activity.

This supplement is not intended to diagnose, treat, cure, or prevent any disease.

Cellucor sticks out in the sports nourishment space for its solid reputation and open-book transparency. This brand is widely recognised for delivering fully disclosed formulas and clearly labelled ingredients, with a focus on potency and purity through branded components such as CarnoSyn, Betapower and AstraGin. This heritage in performance nutrition, plus a track record of industry recognition, gave us confidence in selecting Cellucor as a trusted partner for this high‑stimulant pre‑workout. Our team evaluated how the brand manages formulation science and quality control, emphasising reliability and performance in demanding training environments. This is reinforced by our internal assessment process, where we expect rigorous safety and efficacy standards from every supplier, supported by our our expert team of doctors, nurses, and nutritionists and a commitment to how we verify ingredient quality.