Skip to main content


Medically reviewed by Last updated on Mar 28, 2024.

Excipient (pharmacologically inactive substance)

What is it?

Leucine (C6H13NO2) is the L-isomer is one of the amino acids found in proteins. Leucine is an essential hydrophobic amino acid. It is used in the Leucine may be used some people as a supplement to build muscle. Leucine is also found in fish, meat, and poultry. In the pharmaceutical industry, L-leucine is used for parenteral and enteral nutrition and feeding, and is also used as a flavoring product and tablet lubricant in manufacturing.

List of medications using Leucine

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.