C4 Performance Energy vs GURU Original: which has more caffeine?

C4 Performance Energy has more caffeine than GURU Original on both counts: 200mg per 16 oz can against 140mg per 12 oz can, and about 12mg per fluid ounce against 12. The serving sizes differ, so the table below shows both ways of counting.

C4 Performance Energy vs GURU Original: the numbers

Sources: C4 Performance Energy's figure is verified in our C4 Performance Energy caffeine guide against Caffeine Informer (source); GURU Original's figure is verified in our GURU Original guide against Caffeine Informer (source).

Which one should you pick?

Pick GURU Original when you want the lighter dose or a slower ramp, and C4 Performance 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

• C4 Performance Energy: the full caffeine guide
• GURU Original: the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index

FAQ

Does C4 Performance Energy or GURU Original have more caffeine? C4 Performance Energy: 200mg per 16 oz can versus 140mg per 12 oz can for GURU Original.

Which is stronger per ounce? C4 Performance Energy, at about 12.5mg per fluid ounce versus 11.7mg for GURU Original.