Rockstar Original has more caffeine than NOS Energy: 160mg vs 160mg in the same 16 oz can. That is a 0mg gap, and since the cans match, the per-serving number is the whole story.
Rockstar Original vs NOS Energy: the numbers
| Rockstar Original | NOS Energy | |
|---|---|---|
| Caffeine per serving | 160mg per 16 oz can | 160mg per 16 oz can |
| Caffeine per fl oz | 10.0mg | 10.0mg |
| Servings to reach 400mg (FDA context) | 2.5 | 2.5 |
Sources: Rockstar Original's figure is verified in our Rockstar Original caffeine guide against Rockstar product page (source); NOS Energy's figure is verified in our NOS Energy guide against Caffeine Informer (source).
Which one should you pick?
Pick NOS Energy when you want the lighter dose or a slower ramp, and Rockstar Original 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
- Rockstar Original: the full caffeine guide
- NOS Energy: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Rockstar Original or NOS Energy have more caffeine? Rockstar Original: 160mg per 16 oz can versus 160mg per 16 oz can for NOS Energy.
Which is stronger per ounce? Rockstar Original, at about 10.0mg per fluid ounce versus 10.0mg for NOS Energy.
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.