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Amino Acid

N-Acetyl L-Tyrosine

Also known as: NALT, N-acetyltyrosine, acetyl-L-tyrosine

C
Evidence

N-Acetyl L-Tyrosine is an acetylated form of the amino acid tyrosine that serves as a precursor to catecholamine neurotransmitters (dopamine, norepinephrine, epinephrine). Evidence for cognitive and mood benefits is mixed and moderate at best, with most studies showing modest effects under acute stress or sleep deprivation.

Primary uses

  • Cognitive performance under stress
  • Mental fatigue and focus
  • Mood support
  • Acute stress resilience
  • Cognitive support under stress
  • Attention and focus
  • Mental fatigue resistance
  • Dopamine precursor

How it works

  • Precursor to dopamine and norepinephrine synthesis
  • Enhanced catecholamine availability during cognitive demand
  • Potential restoration of neurotransmitter levels during high stress

Dosage

Typical range
500–2000 mg daily
Timing
Morning or as needed, typically before cognitive demand or stressful situations
With food
Can be taken with or without food, though some evidence suggests taking on empty stomach may optimize absorption
Duration
May be taken acutely during high stress or chronically; tolerance possible with prolonged use
Special populations
Use caution in hyperthyroidism (stimulates thyroid function); monitor in bipolar disorder (potential mood destabilization)

Forms

  • Capsule· 70/100
  • Powder· 70/100
  • Liquid solution· 70/100

Safety

Common side effects

  • Headache
  • Nausea
  • Mild stimulant effects (jitteriness, insomnia if taken late)
  • Increased heart rate at higher doses

Contraindications

  • Hyperthyroidism or overactive thyroid conditions
  • Uncontrolled hypertension (catecholamine precursor)
  • Bipolar disorder (risk of mood elevation/cycling)
  • Concurrent use of stimulant medications (potential additive effects)
  • Pregnancy/lactation (limited safety data)

Known interactions

Evidence notes

Limited RCT evidence with mixed results. Some studies show modest benefits under acute stress or sleep deprivation, but effects are inconsistent and often small. Lacks robust clinical evidence compared to direct dopamine/norepinephrine-supporting compounds. Bioavailability advantages over L-tyrosine are debated.

Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.