C4 Sport (4th Gen) Review
- NSF certified for athletes
- Tested for banned substances & contaminants
- 30 servings per tub
- Low caffeine dose suits sensitive users
- Ingredient doses hidden in proprietary blends
- Very low scoring across the board
- Effective ingredients, but under-dosed
- Superior 5th Gen formula also exists
Effects Timeline
AI-estimated changes in effects over the first 3 hours after taking the recommended serving.
This is the older "4th Generation Legacy Series" version of C4 Sport, which is different from the newer 5th Generation formula.
It is NSF certified, which means it is independently tested for banned substances & contaminants.
Although it has more servings per container than the 5th Gen version, it hides its ingredient doses in proprietary blends and scores weaker across all categories.
It also has significantly less caffeine per serving at 135mg vs. 200mg for the 5th Gen formula.
Honest take: A real step down from the current C4 Sport, cheap for a reason.
C4 Sport (4th Gen) Ingredient breakdown
| Ingredient | Clinically effective dose | Dose in C4 Sport (4th Gen) | Status |
|---|---|---|---|
| Beta-Alanine | 4.5 g | 1.4 g | 31%Under-dosed |
| L-Arginine | 4 g | 0.9 g | 23%Under-dosed |
| Creatine HCl | 5 g | 0.48 g | 10%Under-dosed |
| Magnesium (elemental, from Magnesium Chloride) | 50–150 mg | 12 mg | Hydration support |
| Sodium (elemental, from Sodium Citrate) | 0.3–1 g | 0.06 g | Hydration support |
| Potassium (elemental, from Dipotassium Phosphate) | 100–400 mg | 20 mg | Hydration support |
| Taurine | 2–3 g | 1 g | 50%Under-dosed |
| Caffeine Anhydrous | 200–400 mg | 135 mg | 68%Moderate dose |
| Calcium | 100–300 mg | 25 mg | Hydration support |
- Beta-Alanine1.4 g31%Under-dosed
- L-Arginine0.9 g23%Under-dosed
- Creatine HCl0.48 g10%Under-dosed
- Magnesium (elemental, from Magnesium Chloride)12 mgHydration support
- Sodium (elemental, from Sodium Citrate)60 mgHydration support
- Potassium (elemental, from Dipotassium Phosphate)20 mgHydration support
- Taurine1 g50%Under-dosed
- Caffeine Anhydrous135 mg68%Moderate dose
- Calcium25 mgHydration support
Evidence references
Effect of Beta-Alanine Supplementation on Maximal Intensity Exercise in Trained Young Male Individuals: A Systematic Review and Meta-Analysis
The Effects of Creatine Supplementation on Upper- and Lower-Body Strength and Power: A Systematic Review and Meta-Analysis
Effects of Caffeine Intake on Endurance Running Performance and Time to Exhaustion: A Systematic Review and Meta-Analysis
Does One Shot Work? The Acute Impact of a Single Taurine Dose on Exercise Performance: A Meta-Analytic Review
