Guayaki Yerba Mate (can) has more caffeine than Water Joe (caffeinated water) on both counts: 150mg per 15.5 oz can against 70mg per 16.9 oz bottle, and about 10mg per fluid ounce against 4. 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.
Guayaki Yerba Mate (can) vs Water Joe (caffeinated water): the numbers
| Guayaki Yerba Mate (can) | Water Joe (caffeinated water) | |
|---|---|---|
| Caffeine per serving | 150mg per 15.5 oz can | 70mg per 16.9 oz bottle |
| Caffeine per fl oz | 9.7mg | 4.1mg |
| Servings to reach 400mg (FDA context) | 2.7 | 5.7 |
Sources: Guayaki Yerba Mate (can)'s figure is verified in our Guayaki Yerba Mate (can) caffeine guide against Guayaki product page (source); Water Joe (caffeinated water)'s figure is verified in our Water Joe (caffeinated water) guide against Water Joe / Caffeine Informer (source).
Which one should you pick?
Pick Water Joe (caffeinated water) when you want the lighter dose or a slower ramp, and Guayaki Yerba Mate (can) 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
- Guayaki Yerba Mate (can): the full caffeine guide
- Water Joe (caffeinated water): the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does Guayaki Yerba Mate (can) or Water Joe (caffeinated water) have more caffeine? Guayaki Yerba Mate (can): 150mg per 15.5 oz can versus 70mg per 16.9 oz bottle for Water Joe (caffeinated water).
Which is stronger per ounce? Guayaki Yerba Mate (can), at about 9.7mg per fluid ounce versus 4.1mg for Water Joe (caffeinated water).
Barista Life runs on coffee people. Browse the Barista Life shop to support the site.