Also known as: tyrosine, NALT, N-acetyl L-tyrosine
Latest evidence update: 2026-04-03
Strongest in Replication (80). Held back by Recency (34).
Solid mix of RCTs with some methodological gaps.
Confirmed across many independent studies with significant findings.
Tens of thousands of participants pooled across studies.
Mixed direction across studies.
Mostly pre-2020 research; updates may be needed.
No quantified outcomes for L-Tyrosineyet. Once the corpus has studies with measurable endpoints, you'll see per-outcome magnitude here.
Recommended: 500-2000mg
ProtocolEngine provides general health information based on published research. This is not medical advice. Consult a healthcare professional before starting any supplement or health protocol.
May improve cognitive performance under stress or demanding conditions, including faster information processing and better working memory
Does not improve physical endurance performance or exercise capacity in healthy individuals
Does not provide measurable benefits for growth, neuropsychological development, intelligence, or quality of life in people with phenylketonuria despite raising blood tyrosine levels
May improve mood and reduce depression in hospitalized patients with severe eating disorders
May enhance thermoregulatory responses to cold exposure in older adults