L-Tyrosine Research Reference

Catalog classification, reference sizes, lab math links, and source-backed data. Educational use only — not medical advice.

Researched for: L-Tyrosine evidence and protocol review

Amino Acids & Nutrients compound PowderCapsule verified

Also known as: Tyrosine, 4-Hydroxyphenylalanine

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Quick Facts

Reference Sizes

100 g, 500 g

Storage

No approved consumer storage standard exists for this presentation; follow the lot-specific COA and validated stability data

Solubility

Sparingly water-soluble (~4.5 g/L at 25 deg C); use warm water or slightly acidic solution

Catalog Description

L-tyrosine is a non-essential amino acid and the direct precursor (via tyrosine hydroxylase) to the catecholamine neurotransmitters dopamine, norepinephrine, and epinephrine. It has been studied for maintaining cognitive performance under conditions of acute stress, cold exposure, or sleep deprivation, where catecholamine synthesis may become rate-limited by tyrosine availability.

Catalog descriptions reflect research context only. Not a medical claim or treatment recommendation.

Research Profile

Half-Life

Not well characterized as a standalone human PK value

Onset

Acute dosing (30-60 minutes before stress exposure) used in most performance studies

Administration Routes (Research)

Oral

Reported Research Effects

Catecholamine (dopamine/norepinephrine/epinephrine) synthesis precursor
Studied for cognitive performance under acute stress/sleep deprivation

Reported Research Side Effects

Human safety, pharmacokinetics, and interaction data are incomplete

Data source: Primary literature, regulator records, trial registries, and identity-specific evidence search

Reflects preclinical/research literature context only. Not a medical claim, dosing instruction, or treatment recommendation.

Research Protocols Reported in the Literature

Acute study doses vary, commonly by body weight; no universal performance protocol is established [Oral; Acute study-specific exposure; Before the stressor]Source: rapid evidence assessment

Research Notes

Evidence supports at most a weak, context-dependent cognitive signal during acute stress; it is insufficient for confident general recommendations.

Supplementary research context only. Not medical advice or a treatment recommendation.

Sources

Tyrosine stress and performance rapid evidence assessment — PubMed (NIH)
https://pubmed.ncbi.nlm.nih.gov/26126245/

Tyrosine cognition under stress review — PubMed (NIH)
https://pubmed.ncbi.nlm.nih.gov/26424423/

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Research Use Only. All content is for educational and research reference only. Not medical advice, a treatment recommendation, or guidance on human use. Compounds are not FDA-approved drugs unless specifically noted.