Measure and mix L-Theanine powder only as directed on its label. When combining it with tea, pre-workout products, or other supplements, check every label for caffeine and overlapping ingredients.
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L-Theanine is a non-protein-forming amino acid naturally found in tea leaves. Supplement powders provide the isolated compound, so they are not the same as brewed tea, which can contain caffeine and other components.
Human studies have examined L-Theanine for attention and stress-related outcomes. Results vary by study and population, and reviews note that the clinical relevance remains uncertain. It should not be expected to produce the same effect for every person.