elmatecoYerba mate has real, research-backed health benefits — but like any caffeinated beverage, it’s worth understanding the potential downsides too. Here’s an honest look at what the research actually says about yerba mate’s safety, based on major medical sources including Mayo Clinic, WebMD, and peer-reviewed studies.
The Short Answer
For most healthy adults, yerba mate is considered safe in moderate amounts — generally up to a few cups a day, prepared at a reasonably hot (not scalding) temperature. The concerns below mostly apply to heavy, long-term, or very hot consumption, not to enjoying mate as part of a normal daily routine.
Caffeine-Related Side Effects
Like coffee or strong tea, yerba mate contains caffeine, which can cause insomnia, an upset stomach, increased heart rate, or jitteriness — especially in people sensitive to caffeine, or when consumed in large quantities (some sources point to a threshold around 10 or more cups a day for serious caffeine-related effects). If you’re sensitive to caffeine, start with a smaller amount and see how your body responds, the same way you might with coffee.
The Cancer Risk Question
This is the most-cited concern about yerba mate, so it’s worth explaining clearly. Several epidemiological studies have linked long-term, heavy yerba mate consumption to a higher risk of certain cancers, particularly of the head, neck, and esophagus. However, researchers largely attribute this risk to the temperature at which mate is traditionally consumed — very hot beverages in general (including hot tea and coffee in other cultures) have been associated with similar risks — rather than something unique to the yerba plant itself. The risk appears significantly higher in people who also smoke or drink alcohol heavily, with some studies showing the risk multiplied several times over in that combination specifically.
Practical takeaway: letting your mate cool slightly before drinking, rather than consuming it scalding hot, is a reasonable precaution — and one that’s easy to build into the ritual without changing much about how you enjoy it.
Pregnancy
Because caffeine crosses the placenta, pregnant women are generally advised to limit caffeine intake, including from yerba mate, similarly to how they’d limit coffee or tea. Most health guidance suggests staying under about 200 mg of caffeine per day during pregnancy — roughly two cups of coffee or tea. Some research on mothers who drank yerba mate during pregnancy found no strong link to premature delivery or low birth weight, but as always, it’s worth discussing your specific situation with a doctor.
Who Should Be Extra Cautious
- Heart conditions: caffeine can trigger irregular heartbeat in some people with existing heart conditions.
- Anxiety disorders: caffeine may worsen anxiety symptoms in people prone to them.
- Diabetes: caffeine may affect blood sugar regulation and how warning signs of low blood sugar are perceived.
- Bleeding disorders: caffeine may theoretically slow clotting, though this hasn’t been strongly documented in practice.
- Heavy smokers or drinkers: as noted above, this combination is where most of the cancer-risk research concentrates.
The Bottom Line
For the average healthy adult who enjoys mate the way it’s traditionally consumed — warm rather than scalding, in moderate daily amounts — the current research doesn’t suggest significant cause for concern. As with most things, moderation and a bit of common sense (not drinking it boiling hot, being mindful of total caffeine intake) go a long way. If you have a specific health condition or are pregnant, it’s always worth a quick conversation with your doctor.
Curious about the benefits side of the equation? Check out our guide to yerba mate’s health benefits, or learn how to make yerba mate the traditional way.
This article is for general informational purposes and is not medical advice. Consult a healthcare professional for guidance specific to your health situation.
Sources: Mayo Clinic, WebMD, NCBI/LiverTox, RxList.
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