Cellucor C4 Ultimate supplement bottle
Cellucor

C4 Ultimate Review

What We Researched
2 active ingredients analyzed · 11 inactive ingredients decoded · 5 brand certifications checked · Last updated: Aug 2026
96
Product Score Excellent
81
Brand Score Good

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Caffeine 300 mg —
Carnosyn Beta-Alanine 3.2 g —
Bioavailability Excellent

Absorption Rating

  • Caffeine Good
  • Carnosyn Beta-Alanine Good
Other Ingredients Very Good

Fillers & Additives

  • Water
  • Malic Acid
  • Phosphoric Acid
  • Natural Flavors
  • Citric Acid
  • Sucralose
  • Sodium Benzoate (Preservative) Medium
  • Potassium Sorbate (Preservative)
  • Acesulfame Potassium
  • Sodium Citrate
  • Potassium Phosphate
Efficacy Excellent

Dosage Analysis

  • Caffeine 300 mg Effective
  • Carnosyn Beta-Alanine 3.2 g Effective

Supplement Facts

Ingredient Amount % Daily Value
Caffeine 300 mg
Carnosyn Beta-Alanine 3.2 g

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Water Safe

Dissolves and carries water-soluble ingredients.

Malic Acid Safe

Adds tartness and enhances fruit flavors in gummies and chewables.

Phosphoric Acid Generally_safe

It is used to adjust the pH of supplements.

Natural Flavors Safe

Improves taste of chewable, gummy, or liquid supplements.

Citric Acid Safe

Adds tartness and acts as a natural preservative. Also aids in ingredient stability.

Sucralose Generally_safe

Adds sweetness to chewables, gummies, and powdered supplements without calories.

Sodium Benzoate (Preservative) Generally_safe

It is used to prevent microbial growth.

Potassium Sorbate (Preservative) Generally_safe

It is used as a preservative to prevent the growth of mold and yeast.

Acesulfame Potassium Generally_safe

It is used to provide sweetness without adding calories.

Sodium Citrate Safe

Stabilizes pH and helps maintain ingredient effectiveness.

Potassium Phosphate Generally_safe

It is used to maintain a stable pH in the supplement.

Brand Trust Report
Cellucor

Founded 2002 · Austin, Texas, United States · 349 products · cellucor.com/

Certifications

5 certifications
Nsf Certified For Sport Verified Source
Nsf Gmp Verified Source
NSF Certified for Sport Verified
NSF Contents Certified Verified
NSF Certified Verified

Transparency

3 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source

Violation History

5 incidents
Lawsuit False advertising of XTEND workout powders as having '0 calories'.2023Source
Prop 65 Lead and Cadmium2018-01-23Source
Lawsuit Deceptive packaging and slack-fill of Cellucor C4 Pre-Workout powders.2018Source
Lawsuit False marketing claims regarding the performance-enhancing benefits of various Cellucor supplements.2016Source
Lawsuit Deceptive advertising of C4 Extreme as a 'dietary supplement' while containing the ingredient DMAA.2012Source
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Frequently Asked Questions
Is Cellucor C4 Ultimate a good supplement?

Cellucor C4 Ultimate received a product quality score of 96/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients Of the 11 inactive ingredients, 5 are rated safe and 0 are flagged for review. The manufacturer, Cellucor, holds a brand trust score of 81/100 with 5 verified certifications including Nsf Certified For Sport, Nsf Gmp, NSF Certified for Sport, NSF Contents Certified.

What are the ingredients in Cellucor C4 Ultimate?

Cellucor C4 Ultimate contains 2 active ingredients: Caffeine (300 mg), Carnosyn Beta-Alanine (3.2 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Cellucor C4 Ultimate safe to take?

Cellucor C4 Ultimate has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Cellucor a trustworthy supplement brand?

Cellucor receives a brand trust score of 81/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2002 and headquartered in Austin, Texas, United States, the company offers 349 products in their lineup. They hold 5 verified certifications including Nsf Certified For Sport, Nsf Gmp, NSF Certified for Sport, NSF Contents Certified. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Cellucor has 5 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.