Coca-Cola Zero Sugar has more caffeine than Fresca: 34mg vs 0mg in the same 12 oz can. That is a 34mg gap, and since the cans match, the per-serving number is the whole story.
Coca-Cola Zero Sugar vs Fresca: the numbers
| Coca-Cola Zero Sugar | Fresca | |
|---|---|---|
| Caffeine per serving | 34mg per 12 oz can | 0mg per 12 oz can |
| Caffeine per fl oz | 2.8mg | 0.0mg |
| Servings to reach 400mg (FDA context) | 11.8 | n/a (caffeine-free) |
Sources: Coca-Cola Zero Sugar's figure is verified in our Coca-Cola Zero Sugar caffeine guide against Caffeine Informer (source); Fresca's figure is verified in our Fresca guide against Coca-Cola product facts (source).
The concentration gap is the striking part: Coca-Cola Zero Sugar packs roughly 283 times the caffeine per ounce. Sipping speed matters at that density; a 12 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Fresca when you want the lighter dose or a slower ramp, and Coca-Cola Zero Sugar 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
- Coca-Cola Zero Sugar: the full caffeine guide
- Fresca: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does Coca-Cola Zero Sugar or Fresca have more caffeine? Coca-Cola Zero Sugar: 34mg per 12 oz can versus 0mg per 12 oz can for Fresca.
Which is stronger per ounce? Coca-Cola Zero Sugar, at about 2.8mg per fluid ounce versus 0.0mg for Fresca.
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