Amino Acid
L-Tyrosine
An amino acid that supports dopamine and noradrenaline production, particularly under stress.
KÖGN Health grades L-Tyrosine as A (Strong evidence) and rates it 4.2 out of 5.
Last reviewed · June 2026
Primary effects
- Improved focus
- Stress resilience
- Cognitive performance
How it works
Precursor to catecholamine neurotransmitters, supporting focus and cognitive performance under pressure.
Overview
L-Tyrosine is especially effective in stressful or cognitively demanding situations, where neurotransmitter depletion can impair performance. It helps maintain mental clarity, focus, and decision-making under pressure. It is not typically stimulating on its own but acts as a cognitive stabiliser in high-demand environments.
The evidence
Best supported for protecting working memory and cognitive flexibility during acute stressors — sleep loss, cold, multitasking. Little benefit is seen at baseline in rested individuals.
How to dose it
500–2000 mg per serving, taken before the demanding task.
When to take it
Acute — taken ahead of stress/high-demand periods. The acetylated form (NALT) is common in beverages but its relative bioavailability is debated.
Safety & side effects
Well tolerated. Caution alongside thyroid medication or MAOIs; verify the regulatory status of NALT for UK/EU food supplements.
Works well with
Related ingredients
Graded entries that target the same cognitive goals.
Categories
Educational information, not medical advice. The evidence grade is KÖGN’s editorial assessment of published research, not a health claim. Speak to a qualified clinician before changing what you take.