L-Tyrosine
Dopamine precursor; supports focus and cognitive performance under stress.
By Suplagen Team · Updated
What it is
L-Tyrosine is an amino acid precursor to dopamine, norepinephrine, and epinephrine. It helps maintain cognitive performance during stress or sleep deprivation.
How it works
Precursor to catecholamine neurotransmitters (dopamine, norepinephrine); replenishes depleted stores under stress.
What the evidence says
Moderate evidence for cognitive resilience under acute stress; limited benefit when not under stress.
How much to take
The catalog range is 500 to 2,000 mg per dose, and 2,000 mg is the ceiling. The evidence is moderate for cognitive resilience under acute stress and sleep deprivation, and limited at baseline; it works when your catecholamine stores are depleted, not when they're fine.
Start at 500 mg on a day that actually demands it. Taking it daily as a routine misses the point of the supplement.
When and how to take it
On an empty stomach, 30 to 60 minutes before the demand: an all-nighter's aftermath, a high-stakes day, a cognitively brutal stretch. Never in the evening.
It's the situational entry in our focus guide: it stays in the drawer until the hard day arrives.
Who should skip it
MAOIs are a high-severity interaction, full stop. Levodopa is moderate and thyroid medications mild; hyperthyroidism and melanoma are cautions, since tyrosine feeds both thyroid hormone and melanin pathways. Pregnancy safety isn't established.
Safety Notes
- Most effective when catecholamine stores are depleted (stress, sleep deprivation). Less useful at baseline.
- Use caution with: hyperthyroidism (caution), melanoma (caution).
- MAOIs: Contraindicated; may cause hypertensive crisis.
- levodopa: May compete for absorption; separate dosing.
- thyroid medications: Tyrosine is a thyroid hormone precursor; monitor.
Common questions
How much L-tyrosine should I take?
500 to 2,000 mg, 30 to 60 minutes before a demanding situation, on an empty stomach. 2,000 mg is the ceiling.
When should I take L-tyrosine?
Morning or before the demand, never in the evening. It's for depleted days, stress or sleep loss, not for daily routine use.
Does L-tyrosine work for focus?
Under acute stress and sleep deprivation, with moderate evidence. At baseline, when you're rested and calm, the benefit is limited. It's a tool for the hard days.