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Some possible side effects of theanine
L-theanine is generally considered safe and well-tolerated when taken at appropriate doses. In general, it’s recommended that you don’t exceed 500 milligrams (mg) a day. Most healthy adults can take between 200 mg and 500 mg a day.But like any supplement, it may cause side effects, particularly at high doses. You can also simply try upping your tea intake to help get a good dose of L-theanine.“If you’re trying to get your L-theanine in the form of black tea or green tea, then you’re going to have similar side effects like having too much caffeine,” notes Zumpano.
It’s important to add that these L-theanine side effects are relatively uncommon and tend to be mild. L-theanine is generally considered safe for most people, but it’s always a good idea to talk to your healthcare provider before taking any new supplement, especially if you have any underlying health conditions or are taking medications. In addition, pregnant or breastfeeding (chestfeeding) people should also exercise caution when taking L-theanine, as there’s limited research on its safety in these populations.