Ingredient

L-Tryptophan

L-Tryptophan is an essential amino acid that aids in bodily functions.

All medicines
94
Combination
94
Prescription medication
82
OTC medication
12

MFDS ingredient code M214274

What does it do?

L-Tryptophan is a type of essential amino acid that is primarily used for nutritional supplementation and tonic purposes. This ingredient serves as a precursor for various bioactive substances in the body.

L-Tryptophan is converted into neurotransmitters such as serotonin and melatonin in the body, helping to regulate mood and sleep. It also plays a critical role in protein synthesis, contributing to the maintenance of bodily functions.

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

Good to know

L-Tryptophan is characterized by its direct involvement in the synthesis of neurotransmitters, unlike other amino acids. Additionally, it cannot be synthesized in the body and must be obtained through food or supplements.

Medicines containing this ingredient

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

Category
Dosage form
Strength
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94 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

  • QIs it true that L-tryptophan helps with sleep?

    The explanatory materials state that L-tryptophan is converted into neurotransmitters such as serotonin and melatonin in the body, helping with mood regulation and sleep. It is primarily used in pharmaceuticals for nutritional supplementation and tonics, and if insomnia persists, it is advisable to consult with a physician to identify the underlying cause.

    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.