Get the App
Cellucor C4 Ultimate supplement bottle
Cellucor

C4 Ultimate Review

What We Researched
2 active ingredients analyzed · 11 inactive ingredients decoded · 5 brand certifications checked · Page generated: Sep 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 Source available Primary evidence
Nsf Gmp Source available Primary evidence
NSF Certified for Sport Supporting evidence unavailable
NSF Contents Certified Supporting evidence unavailable
NSF Certified Supporting evidence unavailable

Transparency

3 claims
Third Party Testing Claim — Verified Evidence available Evidence
Testing Lab Disclosure — Verified Evidence available Evidence

Violation History

5 incidents
Lawsuit False advertising of XTEND workout powders as having '0 calories'.2023 Source available Primary source
Prop 65 Lead and Cadmium2018-01-23 Source available Primary source
Lawsuit Deceptive packaging and slack-fill of Cellucor C4 Pre-Workout powders.2018 Source available Primary source
Lawsuit False marketing claims regarding the performance-enhancing benefits of various Cellucor supplements.2016 Source available Primary source
Lawsuit Deceptive advertising of C4 Extreme as a 'dietary supplement' while containing the ingredient DMAA.2012 Source available Primary source
Related Supplements
Tru Niagen Tru Niagen Pro 1000 mg
Tru Niagen Tru Niagen Pro 1000 mg
Product 100 Brand 100
Jamieson Extra Strength D3 2500 IU
Jamieson Extra Strength D3 2500 IU
Product 100 Brand 100
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Product 100 Brand 100
Cellucor COR-Performance Glutamine
Cellucor COR-Performance Glutamine
Product 100 Brand 81
Cellucor COR-Performance Creatine Fruit Punch
Cellucor COR-Performance Creatine Fruit Punch
Product 98 Brand 81
Cellucor COR-Performance Glutamine Fruit Punch
Cellucor COR-Performance Glutamine Fruit Punch
Product 96 Brand 81
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 All 11 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Cellucor, holds a brand trust score of 81/100.

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?

GoodSupp reviewed the inactive-ingredient data available for Cellucor C4 Ultimate. All 11 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. 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. Note: Cellucor has 5 historical regulatory incidents on record, which are factored into the trust score.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Download on App Store Browse All Supplements
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.