C4 Smart Energy has more caffeine than Zevia Energy on both counts: 200mg per 16 oz can against 120mg per 12 oz can, and about 12mg per fluid ounce against 10. The serving sizes differ, so the table below shows both ways of counting.
C4 Smart Energy vs Zevia Energy: the numbers
| C4 Smart Energy | Zevia Energy | |
|---|---|---|
| Caffeine per serving | 200mg per 16 oz can | 120mg per 12 oz can |
| Caffeine per fl oz | 12.5mg | 10.0mg |
| Servings to reach 400mg (FDA context) | 2.0 | 3.3 |
Sources: C4 Smart Energy's figure is verified in our C4 Smart Energy caffeine guide against Cellucor / Caffeine Informer (source); Zevia Energy's figure is verified in our Zevia Energy guide against Zevia / Caffeine Informer (source).
Which one should you pick?
Pick Zevia Energy when you want the lighter dose or a slower ramp, and C4 Smart Energy when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.
Related reading
- C4 Smart Energy: the full caffeine guide
- Zevia Energy: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does C4 Smart Energy or Zevia Energy have more caffeine? C4 Smart Energy: 200mg per 16 oz can versus 120mg per 12 oz can for Zevia Energy.
Which is stronger per ounce? C4 Smart Energy, at about 12.5mg per fluid ounce versus 10.0mg for Zevia Energy.
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