StackTerminal.Health

BETA

L-Tyrosine

L-Tyrosine is an amino acid precursor to dopamine, norepinephrine, & thyroid hormones, often used to support cognitive performance under stress, cold, & sleep deprivation.

cognitivestressfocusperformance
Evidence last reviewed: 05 Apr 2026
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Biomarkers studied
Outcomes directly measured across the evidence records below
Cognitive
Cognitive FunctionPerceived Stress
Evidence
3 records
cognitive performance under sleep deprivation
adults under sleep deprivationRCT
PUBMEDModerate

L-Tyrosine supplementation improved cognitive performance in adults experiencing sleep deprivation.

Dose: 2000 mgDuration: single doseForm: CapsuleTiming: before cognitive tasks
Based on known pharmacology & typical dosing.
cognitive performance under cold stress
military personnel in cold environmentsRCT
PUBMEDModerate

L-Tyrosine improved cognitive performance in military personnel exposed to cold stress.

Dose: 2000 mgDuration: single doseForm: TabletTiming: before exposure to cold
Based on known pharmacology & typical dosing.
cognitive performance under stress
healthy school-aged childrenRCT
PUBMEDModerate

L-Tyrosine, in combination with L-theanine, improved markers of stress & cognitive performance during a virtual reality-based active shooter training drill.

Dose: 2000 mg
Forms
Capsule
Commonly used for ease of dosing.
Powder
Allows for flexible dosing and mixing with liquids.
Tablet
Convenient for on-the-go use.

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