L-Tyrosine

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Precursor to dopamine, norepinephrine, and epinephrine, aiding in focus and cognitive resilience under stress.
May improve cognitive performance during stress and fatigue.
Jongkees, B. J., et al. (2022). "L-Tyrosine supplementation
and cognitive performance: A meta-analysis." Psychopharmacology, 239(5), 1413-1427.