Reign Total Body Fuel has more caffeine than C4 Smart Energy: 300mg vs 200mg in the same 16 oz can. That is a 100mg gap, and since the cans match, the per-serving number is the whole story.
C4 Smart Energy vs Reign Total Body Fuel: the numbers
| C4 Smart Energy | Reign Total Body Fuel | |
|---|---|---|
| Caffeine per serving | 200mg per 16 oz can | 300mg per 16 oz can |
| Caffeine per fl oz | 12.5mg | 18.8mg |
| Servings to reach 400mg (FDA context) | 2.0 | 1.3 |
Sources: C4 Smart Energy's figure is verified in our C4 Smart Energy caffeine guide against Cellucor / Caffeine Informer (source); Reign Total Body Fuel's figure is verified in our Reign Total Body Fuel guide against Caffeine Informer (source).
Which one should you pick?
Pick C4 Smart Energy when you want the lighter dose or a slower ramp, and Reign Total Body Fuel 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
- Reign Total Body Fuel: 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 Reign Total Body Fuel have more caffeine? Reign Total Body Fuel: 300mg per 16 oz can versus 200mg per 16 oz can for C4 Smart Energy.
Which is stronger per ounce? Reign Total Body Fuel, at about 18.8mg per fluid ounce versus 12.5mg for C4 Smart Energy.
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