L-Tyrosine
A real anti-stress cognition effect that only exists under load, sold as an everyday focus pill.
C+
Evidence grade
C+
Worth it
$10-18/month
Typical cost
DoseThe stress studies used large acute doses, 100 to 150 mg/kg (roughly 7 to 10 g for an average adult), taken about an hour before the demand. Everyday products sell 500 to 1,000 mg, a nutritional-scale dose the trials do not cover. Tyrosine is the precursor to dopamine and norepinephrine, which is the mechanism and also the caution list below.
BasisTyrosine has what most nootropics lack: a coherent mechanism with repeated human confirmation inside its niche.
L-tyrosine is the amino acid precursor to dopamine, norepinephrine, and epinephrine. We grade L-Tyrosine C+ on evidence and C+ for worth-it at about $10-18 per month.
What it does
L-tyrosine is the amino acid precursor to dopamine, norepinephrine, and epinephrine. It entered the queue from the Asprey stack extension and carries one of the nootropic category's more honest evidence files, provided the conditions of that evidence are kept attached to it, as this record does.
What the research says
Preserves working memory and cognitive performance under acute stress, sleep loss, and cold in controlled studies
Evidence: moderate. The military research program behind this claim (Banderet and Lieberman; Neri 1995; Deijen) repeatedly found tyrosine blunted cognitive decline during cold exposure, sustained operations, and sleep deprivation, at doses of roughly 100 to 150 mg/kg. The effect is conditional: it appears when catecholamines are being depleted by demand and is absent in rested, comfortable subjects, which is why everyday 'focus' marketing overstates a situational finding.
Tyrosine has what most nootropics lack: a coherent mechanism with repeated human confirmation inside its niche. The niche is narrow (acute performance under genuine physiological stress) and the effect is preservation, not enhancement, which caps the grade. C+ for a real, bounded, well-characterized tool that most buyers will use outside the conditions where it works.
Is it worth it?
Evidence (C+) sits below the leaderboard floor, so the worth-it grade is capped at C+ however inexpensive it is; the derived value lands at the cap. About $14 a month at common doses. Derived from the October 2026 worth-it model.
Typical cost
$10-18/month
Common form, not a brand recommendation
Dosage context established
The stress studies used large acute doses, 100 to 150 mg/kg (roughly 7 to 10 g for an average adult), taken about an hour before the demand. Everyday products sell 500 to 1,000 mg, a nutritional-scale dose the trials do not cover. Tyrosine is the precursor to dopamine and norepinephrine, which is the mechanism and also the caution list below.
Worth-it leaderboard
L-Tyrosine sits outside the worth-it top 20.
L-Tyrosine sits outside the current top 20 on the gated leaderboard. The leaders below clear an evidence floor of B- before price counts at all, so cheap alone never earns a rank.
- 1AWorth itCreatine evidence A-~$5-10/mo
- 2AWorth itCaffeine evidence B+~$5-10/mo
- 3AWorth itVitamin D evidence B~$5-8/mo
See the full worth-it leaderboard →
When the evidence moves a grade, this ranking moves with it. Thursday is where you hear it first.
Safety notes
Generally well tolerated acutely. Because it feeds catecholamine synthesis: caution with MAO inhibitors (hypertensive risk in combination), with hyperthyroidism, and alongside stimulant medications, where effects can stack unpredictably. Migraineurs occasionally report tyrosine-rich loads as triggers, a food-level observation with weak formal evidence. Long-term daily high-dose use is unstudied.
Longevity Lab Report
L-Tyrosine news. Graded when it happens.
The grade on this page stays free. The email carries the news on l-tyrosine: expert moves, dose changes, and what is working, in plain English every Thursday.
Changelog
Last updated 2026-10-23
- 2026-10-23|Graded from the acute-stress cognition literature. The record's central teaching is conditionality: this is one of the few nootropics with repeatable human effects, and they exist only under load, a boundary the everyday-focus market erases.
- 2026-10-23|Listed under cognition, matching this record's graded findings.
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This grade for L-Tyrosine rests on the record above. When a new result changes that record, the grade changes with it, and the Thursday email is where the change lands first: the week's longevity and biohacking news, in plain English, linked back to the reasoning on this page.
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Every grade follows a published rubric, and sponsors never change one. When the evidence moves a grade, Thursday is where you hear it first, before you renew a stack that stopped earning its cost.