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Yerba Mate Tea Side Effects – Are There Any?

Yerba mate tea is a healthy, nutrient-rich, and energizing drink. Many people in South America drink it every day and it is also becoming more popular all over the world.

Are you wondering if yerba mate tea has any side effects or negative impact on your health? I wrote this article to answer that particular question.

One thing that is already proven by research, is that mate tea has many benefits. I have put together a separate article that explains everything about the health benefits of yerba mate.

Next, let’s take a look at the possible side effects and health risks that yerba mate could have.

Pregnant Women and Breastfeeding

Is it safe to drink yerba mate tea while pregnant or breastfeeding?

There are claims that yerba mate could increase the risk of cancer, and this risk would be passed on from mother to the fetus. Another problem could be the relatively high caffeine content of yerba mate.

Yerba mate tea side effects: pregnancy

Cancer Risk

The risk of cancer is related to two things:

  • The high temperature of yerba mate tea could cause esophageal cancer.
  • The possible cancer-inducing compounds found in smoke-dried yerba mate.

The important questions here is, are these real risks and can they be avoided?

The risk of esophageal cancer can be avoided by not drinking too hot (more than 140 Fahrenheit or 60 Celsius) yerba mate.

The possible cancer-inducing compounds in mate tea would be coming from the smoke-drying process of yerba mate leaves. However, most of the mate producers don’t use smoke-drying, and if they do, it’s usually mentioned on the product label.

Unsmoked Yerba Mate

To be sure not to get any carcinogens, choose an unsmoked product like Mate Factor Organic Yerba Mate. You can read more about in this review article with my favorite yerba mate brands.

If you prefer tea bags, I recommend Ecoteas Organic Yerba Mate that is included in my guide with the best yerba mate tea bags.


In general, pregnant women should avoid consuming large amounts of caffeine. 300 mg is the maximum recommended amount per day. However, there is no evidence that even large amounts of yerba mate would cause any problems like miscarriage or low birth weight.

Some babies have shown signs of caffeine withdrawal after birth, if their mothers had been consuming very large amounts of caffeine daily, during the pregnancy. Also, if high amounts of caffeine are consumed during breastfeeding, it could cause stomach problems for the infant.

In conclusion, we can say that it is ok to consume yerba mate while pregnant or breastfeeding. Just remember the following:

  • Don’t drink too much yerba mate daily and don’t make it too strong.
  • When you drink yerba mate, make sure it’s not too hot (over 140 F or 60 C).
  • Choose a product that has not been smoke-dried.

Heart, Blood Pressure and Liver

The caffeine in yerba mate could possibly cause problems for people with heart problems or high blood pressure. Also, consuming large amounts of yerba mate can cause some stress on the liver.

So if you are sensitive to stimulants, have heart problems or high blood pressure, or if you have any liver problems or use medication causing strain on your liver, consult your doctor before consuming any drinks with caffeine.

People with Other Medical Conditions

Alcoholics and Tobacco Smokers

As we know heavy smokers have a much higher risk of cancer, as do heavy drinkers. When you combine these two unhealthy habits you get an even higher risk of cancer.

alcohol and smoking

What happens when you add yerba mate to this equation? Not much, I would say. But there is a possibility that it will further increase the risk of cancer.

Research indicates that heavy alcohol use, smoking, and drinking very hot drinks can have a synergic effect of increasing the risk of cancer significantly.

How to best avoid the risk of cancer?

Quit or reduce smoking and using alcohol. In addition, as mentioned before, don’t drink your yerba mate too hot and don’t consume smoke-dried yerba mate.

Consuming an Excessive Amount of Yerba Mate

If you consume an excessive amount of yerba mate tea, it is possible to get unpleasant side effects.

What is too much, really depends on a person. The point is, that too much caffeine during a short period of time will not make you feel good.

It can cause the following side effects:

  • Nausea, diarrhea, and vomiting
  • Nervousness and restlessness
  • Heart palpitations / increased heart rate and gasping

Yerba Mate Tea Side Effects – Conclusion

As a conclusion, we can say that yerba mate tea is a healthy drink, and for most people, its health benefits greatly overcome the possible side effects.

However, I recommend avoiding excessive amounts of any drink with caffeine, including yerba mate tea.

Finally, if you have a medical condition mentioned above, or if you are pregnant or breastfeeding, be extra careful with your daily caffeine intake. If you drink yerba mate (or any other drink containing caffeine), try not to make it too strong and avoid drinking large amounts of it regularly.

Also, let your tea cool down a little bit before drinking it, and avoid using smoke-dried products if you are worried about the possible cancer risk.

Ready to try yerba mate?

You can find many yerba mate tea reviews on this site that will help you with choosing the right product. You can start by checking out my review of Guayaki Yerba Mate.

Yerba Mate Side Effects FAQ

Does yerba mate tea have any side effects?

In general, yerba mate tea is considered a healthy and safe drink. However, if you have a medical condition such as heart problem, hypertension, or digestive problem (e.g. IBS, acid reflux) it is recommended to consult your doctor before consuming any caffeinated beverages including mate tea. In addition, drinking too much yerba mate can cause negative effects such as nausea, diarrhea, palpitations, and nervousness.

Can I drink yerba mate tea during pregnancy?

It is ok to drink yerba mate during pregnancy, but I would recommend using unsmoked mate products, not drinking it too hot, and avoid consuming excessive amounts.

Is it safe to drink yerba mate while breastfeeding?

Drinking yerba mate while breastfeeding is generally considered safe. However, it is best not to drink too much or too strong mate tea. Also, to mitigate any risk of cancer, use unsmoked products, and let the tea cool down a bit before drinking it.

Can yerba mate cause diarrhea?

Drinking too much yerba mate tea can cause diarrhea for some people. It depends on your tolerance to caffeine and how sensitive your stomach is.

I hope this article provided you with the information you were looking for. If you have any questions or comments related to yerba mate side effects you can post them below.

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Does Yerba Mate Tea have some Side Effects

6 thoughts on “Yerba Mate Tea Side Effects – Are There Any?”

  1. Hi, there.

    Thank you for this informative post. I do love Yerba Mate tea, but unfortunately, I can only drink a small amount of it. Anything more than half a cup and I get an energy rush that doesn’t let me sleep. No kidding! My husband, though, he drinks it even before bedtime, and he says it’s a perfect sleeping aid, lol. Anyway, the health benefits of Yerba Mate tea are way greater than the side effects. I like to serve it as iced tea during the summer. Great refreshment!

    Than you for sharing this info with us.



    • Hi Alexandra! Thanks for your comment. I guess some people are very sensitive to caffeine. Well, at least if you need the energy to get your work done or to do some exercise, all you have to do is drink a small amount of yerba mate! I am more like your husband, I like to drink yerba mate from morning to evening, but I don’t have any trouble sleeping. I also love to make iced yerba mate when it’s hot!

  2. This post has so much helpful information!
    I really like to drink Yerba Mate and feel like it always gives me an extra energy boost.
    You have clearly done your research and this article has tons of useful information in regards to the possible side effects.
    After reading this article, I definitely will be more likely to drink a Yerba Mate because it is such a healthy option for getting an energy boost!

    • Thanks for commenting Jesse! Yerba mate is healthy and excellent for getting more energy. And even there are no notable side effects, It’s still good to know about them.


  3. I love the ubiquitous “scientific” get-out-of-jail-free card these days of “it may…”. It either does or it does not, there is no “may”.
    The abuse of the word “tea” is extremely irritating. Tea is made from one plant, and only one plant, called Camellia sinensis. The word “tea” comes from that medicinal drink that originated in China over 2000 years ago.
    The correct terms for other herbal plant based drinks, such as Yerba etc, are “infusions” (scientific) or “brews” (colloquial).
    It is very odd that in a world so obsessed with education that so many people are illiterate or ignorant. The world is getting dumber by the minute. Do we also call coffee “tea” now ?
    I even found dried Dandelion “coffee” in the store ! They are not even remotely related outside of being plants. What’s next… labelling drinking chocolate as tea?
    Any scientist worth their salt will tell you why it’s a very bad idea not using the correct labels and terminology in a lab.

    • Hi Jamie,

      Thank you for the feedback.

      I get your point and I’m aware that “real tea” is made with Camellia Sinensis.

      But have you considered that language is constantly evolving and there are different “types” of English language? For example, British English, American English, Australian English, and then countless slang versions of all of these. I used the title “Yerba Mate Tea Side Effects” simply because that’s what people seem to put in Google and I want them to find my article. Also, if you put the search phrase “yerba mate tea” into Google Scholar, you can find countless research articles that use this term.

      I am not a native English speaker but do appreciate using correct language and try to do it to my best ability. But sometimes I also prefer to write articles in a less informal way and use words or phrases that some might find annoying.

      Anyways, I hope that you found at least some useful information in my article in addition despite it being irritating.

      All the best,


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