Ingredient

L-Cysteine

L-Cysteine is an important amino acid component for protein synthesis and antioxidant action.

All medicines
47
Combination
47
Prescription medication
15
OTC medication
32

MFDS ingredient code M204437

What does it do?

L-Cysteine belongs to the group of amino acid preparations and is used to aid protein synthesis and antioxidant action in the body. It is primarily utilized for nutritional supplementation or improving skin health together with vitamins.

L-Cysteine acts as an amino acid necessary for the formation of proteins in the body and serves as a precursor to the antioxidant glutathione, preventing cellular damage. This supports the maintenance of bodily functions and skin health.

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

Good to know

L-Cysteine has a unique antioxidant role due to its sulfur content, unlike other amino acids. It is also characterized by its ability to enhance nutritional supplementation effects when used together with B vitamins.

Medicines containing this ingredient

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

Category
Dosage form
Strength
Category

47 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

  • QI saw a medicine that is good for the skin containing L-cysteine; what is this ingredient?

    L-Cysteine is a sulfur-containing amino acid that aids in protein synthesis and has antioxidant properties. It acts as a precursor to the antioxidant glutathione and is primarily used for nutritional supplementation or improving skin health along with vitamins. Its effects may vary from person to person.

    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.