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 HubermanReported use

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

48 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

48 references in 28 episodes from 2021–2026

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.

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