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RANDOMIZED CONTROLLED TRIAL⚠ SINGLE STUDY; NO LONG-TERM FOLLOW-UP; COMBINED L-THEANINE AND L-TYROSINE TOGETHER, SO INDIVIDUAL EFFECT OF L-TYROSINE ALONE UNCLEAR.
L-tyrosine reduced stress markers and improved thinking under mental pressure.
THE RESEARCH DETAIL
Eighty subjects ingested L-theanine and L-tyrosine before a cognitive Stroop challenge and virtual reality active shooter drill. L-tyrosine reduced salivary stress biomarkers and improved aspects of cognitive performance in response to the mental stress challenge.