Supplements / Conditional
L-Tyrosine
Best for: Cognitive performance, Stress
L-Tyrosine is rated limited evidence (tier C on our evidence scale). Acute use under cognitive stress; trials use 100–150 mg/kg. Morning or 30–60 minutes before a high-demand task.
Sources last reviewed
When and how to take L-Tyrosine
- Dose
- Acute use under cognitive stress; trials use 100–150 mg/kg.
- Timing
- Morning or 30–60 minutes before a high-demand task.
- Review
- Use as needed; not daily.
- Forms
- l-tyrosine
What L-Tyrosine is used for
- Real signal for cognition under acute stress, sleep loss, or cold; not a chronic supplement.
- Less useful in well-rested, low-stress conditions.
When Almavivo suggests L-Tyrosine
- If you flagged stress-induced fog or focus fatigue: studied for cognition under acute stress and sleep deprivation.
- If you reported poor sleep, which raises the value of acute cognitive support: studied for preserving working memory under sleep loss.
Who should be careful with L-Tyrosine
- Use only with clinician oversight if you have a thyroid condition.
- Check for interactions if you take prescription medication.
Safety checks for L-Tyrosine
- Needs a clinician's OK: Polypharmacy (5+ prescriptions)
- Needs a clinician's OK: Any prescription medication
- Not suggested: Thyroid disorder
What to look for when buying L-Tyrosine
- Preferred third-party verification: USP Verified, Third-party tested (COA).
- Common contamination risks: Mislabeling / identity.
- Form: Plain L-tyrosine; N-acetyl-L-tyrosine has weaker bioavailability evidence.
Where to get it
We’re building a curated list of third-party-tested products for L-Tyrosine. Each one will meet our quality bar (preferred certifications, contamination screens) and carry an explicit affiliate disclosure.
Your experience
If you’ve tried L-Tyrosine, you can log how it went. This stays on your device — only you see it.
We frame these as personal experience, not medical claims. Self-reported subjective outcomes are influenced by placebo, regression to the mean, and parallel lifestyle changes. We’ll never present ratings as equivalent to RCT evidence.
Research sources for L-Tyrosine
- L-tyrosine for cognition under stress: review (reviewed 2026-04-30)
Related supplements
Almavivo is for education only, not medical advice. Check with a doctor or pharmacist before starting a supplement, especially if you take prescription medicine, are pregnant or breastfeeding, or have a long-term health condition.