Ingredient

L-Leucine

L-Leucine is an essential amino acid that helps with energy metabolism and muscle health.

All medicines
182
Combination
182
Prescription medication
168
OTC medication
14

MFDS ingredient code M222531

What does it do?

L-Leucine is an essential amino acid that the body cannot produce on its own, so it must be obtained through food or supplements. It is primarily used as a tonic for enhancing physical strength and improving muscle function.

L-Leucine promotes muscle protein synthesis, aiding in muscle recovery and growth. It also plays a role in energy metabolism, contributing to fatigue recovery.

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

Good to know

Unlike other amino acids, L-Leucine is used directly as an energy source within the muscles, playing a crucial role in muscle damage recovery. This distinction sets it apart from regular protein supplements.

Medicines containing this ingredient

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

Category
Dosage form
Strength
Category

182 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 L-leucine beneficial for muscles?

    L-Leucine is an essential amino acid that the body cannot produce on its own, promoting muscle protein synthesis, which aids in muscle recovery and growth. In pharmaceuticals, it is used as a tonic for enhancing physical strength, and the dosage instructions may differ by product, so please refer to the product guidelines.

    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.