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    L-Tyrosine

    L-Tyrosine is a non-essential amino acid found naturally in protein-rich foods like chicken, fish, dairy, and soy. It serves as the direct biochemical building block for catecholamine neurotransmitters — dopamine, norepinephrine, and epinephrine — making it one of the most studied amino acids for cognitive performance under demanding conditions.

    Andrew Huberman
    Andrew HubermanTakes it
    Research Evidence
    May improve focus and attention during demanding mental tasks
    Moderate
    Preserves cognitive performance during acute stress and sleep deprivation
    Strong
    Supports working memory under multitasking demands
    Moderate
    Serves as a precursor to increase catecholamine neurotransmitter availability
    Strong
    Potential benefit for mood regulation during high-stress periods
    Limited
    Source: Examine.com

    Expert Evidence

    46 references from 1 expert

    “I do use L-tyrosine from time to time for enhancing focus and motivation, but I want to emphasize from time to time. I've never been one to take L-tyrosine regularly.”

    Controlling Your Dopamine for Motivation, Focus & Satisfaction | Huberman Lab Essentials

    30:11
    Safety & Cautions

    Side Effects

    • Digestive discomfort at high doses
    • Headache
    • Overstimulation or restlessness
    • Post-supplementation dopamine dip or crash
    L-Tyrosine is generally well-tolerated at standard doses. However, individuals taking MAO inhibitors, thyroid medications, or levodopa should consult a healthcare provider before supplementing, as tyrosine can interact with these pathways.
    Pairs Well With
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    N
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    4.4
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    P
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