Ingredient

L-Phenylalanine

L-phenylalanine is an essential amino acid that helps support bodily functions.

All medicines
166
Combination
166
Prescription medication
152
OTC medication
14

MFDS ingredient code M204442

What does it do?

L-phenylalanine is required for protein synthesis as an essential amino acid and is primarily used for nutritional supplementation and tonics. This ingredient cannot be synthesized by the body and must be obtained through food or medication.

L-phenylalanine acts as a precursor for the neurotransmitters dopamine and norepinephrine in the body, assisting in brain function and mood regulation. It also participates in protein synthesis, contributing to tissue repair and growth.

Approved uses differ by product. Check each product's information for its actual use.

Good to know

L-phenylalanine is characterized by its direct involvement in the production of neurotransmitters, unlike other amino acids. Additionally, as an essential amino acid, it is an important factor that must be supplied externally.

Medicines containing this ingredient

Even with the same ingredient, strength, dosage form and how it is taken can differ.

Category
Dosage form
Strength
Category

166 total

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Even with the same ingredient, dosage and approved uses can differ by strength, dosage form and combined ingredients. Check each product's information before taking it.

Combined ingredients

Ingredients used together with this ingredient in combination products.

Questions about this ingredient

  • QWhat is L-phenylalanine?

    L-phenylalanine is an essential amino acid that the body cannot synthesize, used in protein synthesis and acts as a precursor to neurotransmitters such as dopamine and norepinephrine. In medicines, it is mainly included for nutritional supplementation and energizing purposes.

    Answers 1 · 2026.09.14

For anything that needs medical judgment, consult a doctor or pharmacist.

SourceKorea Ministry of Food and Drug Safety (Drug Safety Korea)

This drug information is based on data provided by the Korea Ministry of Food and Drug Safety.
Consult a doctor or pharmacist for accurate dosage, administration, and usage instructions.