C4 Smart Energy has more caffeine than AMP Energy Original: 200mg vs 142mg in the same 16 oz can. That is a 58mg gap, and since the cans match, the per-serving number is the whole story.
AMP Energy Original vs C4 Smart Energy: the numbers
| AMP Energy Original | C4 Smart Energy | |
|---|---|---|
| Caffeine per serving | 142mg per 16 oz can | 200mg per 16 oz can |
| Caffeine per fl oz | 8.9mg | 12.5mg |
| Servings to reach 400mg (FDA context) | 2.8 | 2.0 |
Sources: AMP Energy Original's figure is verified in our AMP Energy Original caffeine guide against Caffeine Informer (source); C4 Smart Energy's figure is verified in our C4 Smart Energy guide against Cellucor / Caffeine Informer (source).
Which one should you pick?
Pick AMP Energy Original 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
- AMP Energy Original: the full caffeine guide
- C4 Smart Energy: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does AMP Energy Original or C4 Smart Energy have more caffeine? C4 Smart Energy: 200mg per 16 oz can versus 142mg per 16 oz can for AMP Energy Original.
Which is stronger per ounce? C4 Smart Energy, at about 12.5mg per fluid ounce versus 8.9mg for AMP Energy Original.
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