Ingredient

L-Tryptophan

L-Tryptophan is an essential amino acid used in the body for protein synthesis and neurotransmitter production.

All medicines
74
Combination
74
Prescription medication
73
OTC medication
1

MFDS ingredient code M218015

What does it do?

L-Tryptophan is an essential amino acid that the human body cannot produce on its own. It is primarily needed for protein synthesis and is used as a precursor to the neurotransmitter serotonin. In pharmaceuticals, it is utilized for nutritional supplementation and the treatment of certain metabolic disorders.

In the body, L-Tryptophan is converted into the neurotransmitter serotonin, which helps regulate mood and sleep. It also plays a crucial role in protein synthesis, supporting tissue growth and repair.

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 production of neurotransmitters, unlike other amino acids. This plays a vital role in enhancing nervous system function, setting it apart from simple nutritional supplements.

Medicines containing this ingredient

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

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74 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

  • QWill tryptophan help when feeling down?

    The documentation states that L-tryptophan is converted into serotonin in the body, which helps regulate mood and sleep. However, if feelings of depression persist, seeking medical attention is more important than dietary supplementation, so please consult a physician and check with them about taking it along with any medications you are currently on.

    Answers 1 · 2026.09.14

  • QWhat does it mean that tryptophan is an essential amino acid?

    L-tryptophan is an essential amino acid that cannot be produced by the body and must be obtained from external sources. It is necessary for protein synthesis and serves as a precursor for the neurotransmitter serotonin.

    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.