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Also known as L-Tyrosine, N-Acetyl-L-Tyrosine
Non-essential amino acid and precursor to dopamine and noradrenaline via the enzyme tyrosine hydroxylase; most consistent evidence is for preserving cognitive performance under acute stress, sleep loss, or cold exposure rather than baseline mood.
We link to relevant studies and leave interpretation to you and your healthcare professional.
Where people report using it and what trials suggest
Common claims the trials do not support
Catecholamine-precursor amino acid with specific evidence for cognition under acute, real stress (cold, sleep loss, multitasking) — not an everyday focus pill.
Safety notes: Benign at supplement doses; avoid with MAOIs and thyroid conditions (it is a thyroid-hormone precursor).
Evidence grades reflect study quality and consistency, not marketing claims.
Associated conditions and community-reported outcomes, wrapped together on one page. Aggregates appear only once enough reports arrive.
How this compound is sold in the UK, and where our readers typically find it.
Retailer search links — we may earn commission on purchases at no cost to you. Commission never affects our evidence ratings.