Rockstar XDurance vs yerba mate: which has more caffeine?

Rockstar XDurance has more caffeine than yerba mate on both counts: 300mg per 16 oz can against 85mg per 8 oz cup, and about 19mg per fluid ounce against 11. The serving sizes differ, so the table below shows both ways of counting.

These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.

Rockstar XDurance vs yerba mate: the numbers

Sources: Rockstar XDurance's figure is verified in our Rockstar XDurance caffeine guide against Rockstar product page / Caffeine Informer (source); yerba mate's figure is verified in our yerba mate guide against Caffeine Informer / compiled (source).

Which one should you pick?

Pick yerba mate when you want the lighter dose or a slower ramp, and Rockstar XDurance 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 XDurance: the full caffeine guide
• yerba mate: the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Does Rockstar XDurance or yerba mate have more caffeine? Rockstar XDurance: 300mg per 16 oz can versus 85mg per 8 oz cup for yerba mate.

Which is stronger per ounce? Rockstar XDurance, at about 18.8mg per fluid ounce versus 10.6mg for yerba mate.