L-Tyrosine
Catecholamine precursor (dopamine, norepinephrine) that may preserve cognitive performance under stress, sleep deprivation, or cold exposure.
focusstresscognitive
Dosing model
FLATFixed dose (no body-weight scaling).
Min dose
500 mg
Max dose
2000 mg
Rounding
100 mg
Stacks containing L-Tyrosine
Public community stacks that include this ingredient.
sleepfocus
Non-Stimulant Focus Stack
by@athlete
Supports attention and cognitive resilience without stimulants.
L-Theanine
200mg
L-Tyrosine
1000mg
New
Evidence
2 records
Cognitive performance under stress / demanding conditions
Healthy adults under stress (cold, sleep loss, cognitive load) • Rapid evidence assessment / systematic review
Weak recommendation in favor of tyrosine for cognitive stress — all reviewed studies showed positive effects; benefits most evident under high environmental demands (cold, fatigue, workload), not at rest.
Dose: 2000 mg • Duration: Acute
Tyrosine appears ineffective when catecholamine systems are not stressed; benefits are situational.
Working memory under cold exposure
Healthy adults undergoing cold stress • RCT
Tyrosine supplementation significantly mitigated cold-induced working memory deficits; proposed mechanism via maintenance of brain catecholamine levels during physiological stress.
Dose: 2000 mg • Duration: Acute
Benefits appear specific to conditions of catecholamine depletion (stress, fatigue, cold).
Forms
L-Tyrosine (free form)
NALT (N-acetyl L-tyrosine) has lower conversion efficiency; free form preferred.