Cellucor C4 Ultimate, Cosmic Rainbow - 520 grams
Cellucor C4 Ultimate, Bubblegum - 508 grams
Cellucor C4 Ultimate, Tutti Frutti - 496 grams
Cellucor C4 Ultimate, Lemon Twist - 520 grams
Cellucor C4 Ultimate, Cosmic Rainbow - 520 grams
Cellucor C4 Ultimate, Bubblegum - 508 grams
Cellucor C4 Ultimate, Tutti Frutti - 496 grams
Cellucor C4 Ultimate, Lemon Twist - 520 grams
"Very quick delivery. Used 3 times, each order arrived the next day before 12:00"
Hugo Dover
"Reliable & original products, with fast next day delivery. Have been using Welzo for over a year now."
Elina Goulliard
"Welzo is great, lots of support from customer service who are easy to get a hold of and quick delivery."
Elizabeth Moore

Product Description

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.

Ingredients/Specifications

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+

UK Delivery & Returns

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.

How to use

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.

Nutritional Information

  Amount
Per 100g
Amount
Per Serving
%RI*
Vitamin B6 1.6154 mg 0.42 mg 30%
Vitamin B12 10 mg 2.6 mg 104%
Potassium 2307.6923 mg 600 mg 30%
Magnesium 461.5385 mg 120 mg 32%
Sodium 1846.1538 mg 480 mg
L-Citrulline 26923.0769 mg 7000 mg
CarnoSyn Beta-Alanine 18461.5385 mg 4800 mg
BetaPower Betaine 4807.6923 mg 1250 mg
L-Tyrosine 1923.0769 mg 500 mg
Caffeine 1153.8462 mg 300 mg
Choline 769.2308 mg 200 mg
CereBoost 769.2308 mg 200 mg
EnXtra 576.9231 mg 150 mg
AstraGin 134.6154 mg 35 mg

*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.

Why it's Welzo

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.

Cellucor C4 Ultimate Powder

54 Reviews
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C4 Ultimate Powder is a strong stimulant pre-workout that powers intense sessions with lasting energy, sharper focus and mighty pumps.
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Product Description

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.

Ingredients/Specifications

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+

UK Delivery & Returns

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.

How to use

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.

Nutritional Information

  Amount
Per 100g
Amount
Per Serving
%RI*
Vitamin B6 1.6154 mg 0.42 mg 30%
Vitamin B12 10 mg 2.6 mg 104%
Potassium 2307.6923 mg 600 mg 30%
Magnesium 461.5385 mg 120 mg 32%
Sodium 1846.1538 mg 480 mg
L-Citrulline 26923.0769 mg 7000 mg
CarnoSyn Beta-Alanine 18461.5385 mg 4800 mg
BetaPower Betaine 4807.6923 mg 1250 mg
L-Tyrosine 1923.0769 mg 500 mg
Caffeine 1153.8462 mg 300 mg
Choline 769.2308 mg 200 mg
CereBoost 769.2308 mg 200 mg
EnXtra 576.9231 mg 150 mg
AstraGin 134.6154 mg 35 mg

*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.

Why it's Welzo

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.

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Disclaimer

Content team: Dr Sameer Nakedar

Role: Chief Medical Officer

MBBS (London, UK), MRCGP, PGCert

Content team: Paola Drexlar

Role: Medical Content Writer, UK

BA (Hons) Journalism