C4 Original Pre Workout
Backed by 20 studiesOverall grade based on research across 2 ingredients.
48out of 100Grade D
Research evidence score
Weighed against 20 published studies · led by Caffeine
Ingredient breakdown
D
CaffeineImproves alertness and cognitive performance
Research direction: Mixed findingsEvidence: 20 studiesEvidence strength: Weak - research is split or limited
The effect of caffeine supplementation on muscular strength and endurance: A meta-analysis of meta-analyses (2024)Does ergogenic effect of caffeine supplementation depend on CYP1A2 genotypes? A systematic review with meta-analysis (2023)The effects of caffeine supplementation on blood pressure in adults: A systematic review and dose-response meta-analysis. (2023)
—
Beta-alanineImproves exercise endurance and reduces fatigue
Research direction: No studies foundEvidence: 0 studiesEvidence strength: Not enough research yet - no studies found for this specific claim
This summary describes only the ingredients and the research behind them — it is not a judgment of the product or its marketing. Grades reflect the weight of published evidence cross-referenced against 350M+ research papers. How we grade →
Check what's really in your products
Scan any label and see what the research actually says.
Scan a product