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Green Tea Extract Side Effects

green tea extract side effects
Last modified: August 14th, 2018 12:00 pm

At the end of the summer season last year, we promoted green tea extract in a detailed blog post heading in to the colder months.  People tend to run out of energy and put on a few extra pounds when the winter months come around so there is a noticeable increase of green tea consumption throughout the nation heading in to October and November.  Sales seem to plateau and pick back up around April, as the warmer months are coming back.  The change in season and green tea extract consumption rates relate so closely because people are first, panicking and trying to prevent the weight gain that seems to come with winter, and then second, trying to get back in to shape for bathing suit season!  Well, it’s that time of year for the latter and in preparation for that, we want you to be aware of the potential green tea extract side effects…

Green Tea Extract Side Effects?  What Side Effects?

We know… it’s almost hard to believe that something so natural, void of human synthetics, would come with a plethora of side effects.  I mean, seriously.  When was the last time you stopped in a Starbucks, ordered a tea, and stopped for a second to think about how this tea could negatively affect you?  You haven’t because that would be insane.

The truth is, high levels of green tea consumption and green tea extract CAN have undesirable side effects.  Let’s take a look at the 5 most worrisome first!

  1. It’s entirely possibly to overdose on caffeine.  Green tea extract contains high levels of caffeine, so we need to understand that moderation is key.  A fatal dose of caffeine is between 10 and 14 grams.  That’s quite a bit of green tea extract since one capsule typically contains 300mg to 600mg,
  2. Infant Fatality. Pregnant women should not consume anything more than a low level of caffeine.  It would only take a few grams to create a toxic environment for an unborn child.  Nursing mothers also need to be aware that the caffeine can pass through breast milk.
  3. Heart Conditions. Green tea extract can cause irregular heartbeats and force people with weak hearts in to cardiac arrest.  It’s best to avoid products with high levels of caffeine if you have known heart issues.
  4. High blood pressure. This sort of goes hand in hand with #3.  If you’ve struggled with blood pressure in the past then it’s best you look for your antioxidant supplementation from some other means… especially if you’re on blood pressure medication.
  5. Liver disease. Unsurprisingly, the liver rounds up our list of top 5.  Almost every supplement on the market effects the liver negatively.  If you’ve got a weak liver from previous abuse, avoid green tea extract supplementation.

Being honest, it’s super unlikely you’re going to experience any of those nasty side effects.  The more common, less concerning side effects include headaches, nausea, and insomnia but even those are fairly uncommon or pass within just a few days of supplementation, once your body is used to it.  If you have more questions or concerns about your specific scenario, it’s always going to be best to reach out to your doctor.  Make sure you do some more research so that you understand it’s not all doom and gloom!

SR Content Strategist & Fitness Expert

Matt Weik, the owner of Weik Fitness, LLC, is a well-respected fitness expert/author/podcaster with a global following. His work has been featured in nearly 100 fitness magazines (Flex Magazine, Men’s Muscle & Health Magazine, Oxygen Magazine), 2,000+ websites, as well as having numerous books and audiobooks that are published.  Matt Weik graduated from Penn State University with a degree in Kinesiology. He is a certified strength and conditioning specialist, personal trainer, and sports nutritionist. Matt is a member of the supplement expert panel at the Awards 2018.

You can contact Matt via or on social media links below.

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