L-theanine
Studied with caffeine. A mild effect within the hour.
Grade B: Some human proof
Small, early or mixed results in people.
The grade is for the use people talk about, not for every use. Filed under: Brain support, over the counter.
How it works
An amino acid from tea that promotes a calm, alert state.
How it was given in studies
By mouth. In the trials people swallowed it as a capsule, tablet, powder or drink.
This is what the studies did. It is not a how-to.
What studies saw
In a small trial, theanine with a little caffeine sharpened focus and accuracy 60 to 90 minutes after a dose.
The trade-off
Effects are mild. Few long-term studies.
When it showed up, in studies
With caffeine, sharper focus 60 to 90 minutes after a dose.
Sources
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Keep going
We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.