StackTerminal.Health

BETA

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

Evidence
3 records
3 recordsBest grade:Low
Biomarkers
Cognitive FunctionMood / Wellbeing

The evidence for L-Phenylalanine is limited, with low-quality studies suggesting potential benefits for mood and pain management. Gaps exist in robust clinical trials, and more research is needed to confirm its efficacy.

Cognitive function
General population · Theoretical
Very low

As a precursor to neurotransmitters, L-Phenylalanine may support cognitive function.

Dose: 2000 mg
No direct studies available.
Mood enhancement
General population · Systematic review
Low

L-Phenylalanine may support mood elevation through its role in catecholamine synthesis.

Dose: 2000 mg
Indirect evidence from related conditions.
Pain management
Patients with vitiligo · Systematic review
Low

L-Phenylalanine may aid in pain management for conditions like vitiligo.

Dose: 2000 mg
Evidence is indirect & based on related conditions.
Stacks containing L-Phenylalanine
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cognitivemoodfocus

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
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Forms & usage
How to take it

Take 500-1000 mg daily, preferably on an empty stomach.

Free-form
Commonly available as a dietary supplement.
DL-Phenylalanine
A racemic mixture sometimes used for pain relief.
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