L-Tyrosine
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L-Tyrosine. Catecholamine precursor preserving cognition under stress and sleep deprivation.
How it works. Precursor to dopamine, norepinephrine, and epinephrine; rate-limiting under acute stress.
What the research supports. 1 graded claims. Strongest: Preserves cognitive performance under acute stress/sleep loss (moderate).
How much to take. Typical dose: 500–2000 mg. 30–60 min before task.
Side effects and interactions. 3 medication interactions listed. No serious side effects listed at normal doses.
Stacking. Pairs well with Omega-3 (EPA/DHA), Alpha-GPC or CDP-choline, Ashwagandha.
Common forms. Available as L-Tyrosine, NALT (debated bioavailability).
Key studies. 8 studies cited. The strongest are listed with links to PubMed.
Community. Experiences from people who have tried L-Tyrosine. Anecdotes are not medical advice.
L-Tyrosine. Catecholamine precursor preserving cognition under stress and sleep deprivation.
What it is
Catecholamine precursor preserving cognition under stress and sleep deprivation.
Also called
Food sources
Goals
How it works
Precursor to dopamine, norepinephrine, and epinephrine; rate-limiting under acute stress.
Pathways
- Catecholamine synthesis
Effects
- +Cognition under stress supports
- ↑Catecholamine substrate increases
What the research supports
Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.
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Side effects & interactions
Common side effects
- Headache
Medication interactions
Hypertensive crisis risk.
Competes for transport.
T4 precursor — monitor.
Check any supplement–medication combination with your pharmacist before starting.
Combines with
Pairs well
- Omega-3 (EPA/DHA)Membrane fluidity and neuronal signaling support.
- Alpha-GPC or CDP-cholineProvides choline substrate for acetylcholine synthesis.
- AshwagandhaAdaptogenic HPA-axis modulation.
Common forms
- L-Tyrosine
- NALT (debated bioavailability)
Key studies
8 studies cited in total.
Opens current human and preclinical literature matching L-Tyrosine and "Preserves cognitive performance under acute stress/sleep loss". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching L-Tyrosine and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching L-Tyrosine and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.
Discussion
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