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To date, little is known about the safety of using L-theanine supplements in the long term. L-theanine is generally considered safe when consumed in green tea. However, the National Institutes of Health (NIH) cautions against drinking more than five cups of green tea daily.
Due to the caffeine content, excessive consumption of green tea may also trigger certain side effects. These may include a headache, insomnia, irritability, diarrhea, and heartburn.
There's also some concern that taking L-theanine in combination with sedatives, lipid-lowering medications, and/or drugs used in chemotherapy may produce harmful effects.
Dietary supplements have not been tested for safety. Because they are largely unregulated, the content of some products may differ from what is specified on the product label.
Keep in mind that the safety of supplements in pregnant women, nursing mothers, children, and those with medical conditions or who are taking medications has not been established. *
L-theanine has been studied extensively, and it’s safe when consumed at standard dosage, and it isn’t habit-forming. Side effects of L-theanine include headaches, dizziness, or nausea. These side effects are quite rare, and if present, they’re usually only seen with higher doses. If you experience these symptoms, reduce your dosage, or stop taking L-theanine entirely. *
