L-Tyrosine
amino acids
L-Tyrosine is a semi-essential amino acid that serves as a precursor to important neurotransmitters including dopamine, noradrenaline, and adrenaline. It is commonly used to support cognitive function, mental focus, and stress resilience, particularly during periods of high physical or psychological demand.
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Benefits
Dosage
Typical Dose
500–2000 mg daily
Upper Limit
3000 mg daily
Timing
Morning or early afternoon on an empty stomach for optimal absorption; avoid evening use
Forms & Bioavailability
L-Tyrosine powder
High absorption on empty stomach; slightly reduced with food
L-Tyrosine capsules
Reliable and consistent; slower onset than powder
N-Acetyl L-Tyrosine (NALT)
More stable form with potentially better bioavailability; preferred by some for absorption
Side Effects
Interactions
Research Summary
Research demonstrates that L-Tyrosine can improve cognitive performance and stress resilience, particularly in acute stressful situations such as cold exposure or multi-tasking. Studies suggest it is most effective when dopamine levels are depleted, making it useful for fatigue and mental fatigue rather than baseline cognitive enhancement. Evidence is moderate, with mixed results in non-stressed populations.
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The Bottom Line on L-Tyrosine
L-Tyrosine is moderately researched with promising but sometimes mixed evidence.It is most commonly used for supports dopamine production and mood regulation and enhances cognitive function and mental clarity. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
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Goal Guides for L-Tyrosine
See how L-Tyrosine can help with specific health goals: