L-Phenylalanine
L-Phenylalanine is an essential amino acid that serves as a precursor to tyrosine & catecholamines, potentially supporting mood & pain management.
painmoodcognitivemental-health
Evidence last reviewed: 05 Apr 2026
Biomarkers studied
Outcomes directly measured across the evidence records below
Cognitive
Mood / WellbeingCognitive Function
Evidence
3 records
Mood enhancement
General population • Systematic review
PUBMEDLow
L-Phenylalanine may support mood elevation through its role in catecholamine synthesis.
Dose: 2000 mg
Citation: Szczurko et al. (2008). A systematic review of natural health product treatment for vitiligo.
Indirect evidence from related conditions.
Cognitive function
General population • Theoretical
PUBMEDVery low
As a precursor to neurotransmitters, L-Phenylalanine may support cognitive function.
Dose: 2000 mg
Citation: Theoretical based on known pharmacology.
No direct studies available.
Pain management
Patients with vitiligo • Systematic review
PUBMEDLow
L-Phenylalanine may aid in pain management for conditions like vitiligo.
Dose: 2000 mg
Citation: Szczurko et al. (2008). A systematic review of natural health product treatment for vitiligo.
Evidence is indirect & based on related conditions.
Forms
Free-form
Commonly available as a dietary supplement.
DL-Phenylalanine
A racemic mixture sometimes used for pain relief.
Stacks containing L-Phenylalanine
Public community stacks that include this ingredient.
cognitivemoodfocus
Cognitive & Mood Support
by@athlete
Pramiracetam & phenylalanine are combined to support cognitive function & mood. Pramiracetam enhances memory & cognitive performance, while phenylalanine supports mood & cognitive function by acting as a precursor to neurotransmitters.
Pramiracetam
400mg
L-Phenylalanine
500mg
New