L-theanine (also known as just
theanine) is an amino acid used in
dietary supplements. It is a natural component of tea. As with most supplements, people use L-theanine for a number of different uses. L-theanine supplements are sometimes claimed to be helpful for the following purposes:
L-theanine studies are generally lacking. Research is in early stages, and much more research is necessary before L-theanine can be confirmed to be safe and effective for any use.
One study demonstrated that L-theanine could help healthy people (with no anxiety problems) to feel more tranquil. This should be interpreted to mean that it also will be effective for treating
anxiety disorders. Early evidence suggests that L-theanine could increase the effectiveness of certain chemotherapy medications and may actually decrease some of the side effects of such medications. Animal studies suggest that L-theanine may be effective for
lowering blood pressure and for protecting against liver damage from alcohol poisoning, but human studies are needed to confirm such findings.
Final Thoughts on L-Theanine Effectiveness
Very preliminary research suggests that L-theanine may work for several conditions. However, much more research is needed to confirm that L-theanine is indeed effective (and safe) for any use. It is important to remember that L-theanine is classified as a dietary supplement (not a drug) and is, therefore, less strictly regulated than drugs.
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