L-theanine is an amino acid found primarily in green and black tea and some mushrooms. It's also available in pill or tablet form. It's said to help ease anxiety, stress, and reduce insomnia. Before trying it out yourself, learn more about the potential health benefits, as well as any possible risks or complications.
Theanine is an amino acid found in tea and some mushrooms. It comes in two forms: L-theanine and D-theanine. L-theanine is the most common form.
Theanine is similar to glutamate, a naturally occurring amino acid. Glutamate helps transmit nerve impulses in the brain. Theanine sometimes acts like glutamate in the body. But other times it seems to block the effects of glutamate. Theanine might also affect the brain chemicals GABA, dopamine, and serotonin.
Memory and thinking skills (cognitive function). Taking L-theanine by mouth might help healthy people stay focused. It isn't clear if adding L-theanine to caffeine works better than using either of those ingredients alone.
Don't confuse theanine with another amino acid called threonine. These are not the same.
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