Cellucor C4 Original Cosmic Rainbow is a pre-workout powder that helps you train tougher and longer, driven by CarnoSyn beta alanine and relied on by athletes. Energy, focus and endurance power through tough workouts, and Cellucor brings over twenty years in sport nutrition and maintains strict quality standards that athletes rely on.

Benefits & Features:

• Boosts energy for sustained workouts as c4 pre workout.
• Increases focus, helping you stay sharp and resilient through demanding sessions.
• Creatine monohydrate supports power and strength gains across sets, improving performance across routines.
• Beta alanine helps delay fatigue by buffering acid buildup, enabling longer efforts and better form when pushing through tough repetitions, so you can finish workouts stronger.
• N acetyl L tyrosine supports focus under stress, helping you stay mentally on track while you push through training blocks and maintain consistency week after week.

Cellucor’s reputation isn’t just a claim. With more than twenty years in sports nutrition, the brand has honed a formula that blends proven performance compounds with clear quality standards. CarnoSyn beta alanine boosts endurance, creatine monohydrate supports power, caffeine sharpens focus, and N acetyl L tyrosine aids cognitive resilience under stress. Made in GMP facilities and trusted by professional athletes, this pre workout stands out for dependable energy and consistent results. It isn’t a vitamin d supplement, but it partners well with daily wellness routines.

Vitamin C, Niacin, Vitamin B6, Folic Acid, Vitamin B12, CarnoSyn Beta-Alanine, Creatine Monohydrate, Creatine, Arginine Hydrochloride, N-acetyl-L-tyrosine, Caffeine

• GTIN: 5056569900409
• Manufacturer: Cellucor
• Size: 207 grams
• Categories: Best SellersCellucorSports Supplements Black Friday Sale
• 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 one scoop of Cellucor C4 Original, Cosmic Rainbow with 6-8 ounces of water. For a stronger effect, use up to two scoops with 12-16 ounces of water. Drink 20-30 minutes before your workout for maximum energy and focus. Avoid taking close to bedtime due to caffeine content. Store in a cool, dry place, away from direct sunlight and moisture. Keep out of reach of children. This product is only intended for healthy adults, 18 years of age or older. Do not use if pregnant, nursing, or taking medications for chest pain or erectile dysfunction. Consult a healthcare professional before use if you have any medical conditions or are taking other medications. Discontinue use and consult a doctor if you experience any adverse reactions. Do not exceed the recommended daily dose.

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: Beta-Alanine (CarnoSyn)

This key component is Beta-Alanine (CarnoSyn) and it’s a non essential amino acid used to help performance during high intensity exercise. This form, CarnoSyn beta-alanine, is commonly chosen for athletic performance applications.

This setup is used to help buffer muscle acidity during intense effort, helping longer endurance during tough workouts.

What Does Beta-Alanine Do?

Beta-alanine helps to maintain muscle buffering capacity, which supports sustained performance in repeated and intense efforts.

It participates in processes linked to better endurance and training tolerance during high intensity activity.

*This product is not meant to diagnose, treat, cure, or prevent any disease.

Cellucor brings over two decades of sport nutrition know‑how to Welzo, making it our trusted pick for this performance‑ready supplement. The manufacturer, Nutrabolt, is known for solid manufacturing practices and a long‑standing reputation in the industry, with facilities operating under GMP and select products carrying NSF Certified for Sport credentials that many athletes rely on.

Cellucor C4 Original Cosmic Rainbow is formulated with proven performance ingredients such as CarnoSyn Beta‑Alanine, Creatine Monohydrate and Caffeine Anhydrous, paired with absorption‑friendly vitamins. This brand’s commitment to transparent labelling and product integrity aligns with our high standards, and the product’s ingredient suite is supported by independent studies noted in the brand context.

This brand was evaluated by our expert team of doctors, nurses, and nutritionists for compliance with our quality assurance criteria, ensuring a robust fit for a performance‑focused pre‑workout. We selected Cellucor because of its manufacturing excellence, clear quality controls, and proven ability to deliver consistent, trusted products for athletes.