Prime Energy has more caffeine than Reign Storm: 200mg vs 200mg in the same 12 oz can. That is a 0mg gap, and since the cans match, the per-serving number is the whole story.
Prime Energy vs Reign Storm: the numbers
| Prime Energy | Reign Storm | |
|---|---|---|
| Caffeine per serving | 200mg per 12 oz can | 200mg per 12 oz can |
| Caffeine per fl oz | 16.7mg | 16.7mg |
| Servings to reach 400mg (FDA context) | 2.0 | 2.0 |
Sources: Prime Energy's figure is verified in our Prime Energy caffeine guide against Caffeine Informer (source); Reign Storm's figure is verified in our Reign Storm guide against Caffeine Informer (source).
Which one should you pick?
Pick Reign Storm when you want the lighter dose or a slower ramp, and Prime 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
- Prime Energy: the full caffeine guide
- Reign Storm: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Prime Energy or Reign Storm have more caffeine? Prime Energy: 200mg per 12 oz can versus 200mg per 12 oz can for Reign Storm.
Which is stronger per ounce? Prime Energy, at about 16.7mg per fluid ounce versus 16.7mg for Reign Storm.
Comparing caffeine? The caffeine comparison tool puts hundreds of drinks side by side, and the caffeine curfew calculator can check your cutoff time for tonight.