L-ornithine-L-aspartate, sold under the name Hepa-Merz Granul, is a chemical made up of the two amino acids ornithine and aspartic acid. Most amino acids are used as building blocks to make protein. But L-ornithine-L-aspartate is not used to make protein. Instead, it is broken down in the body to provide ornithine and aspartic acid.
L-ornithine-L-aspartate is most commonly used for reduced brain function in people with advanced liver disease (hepatic encephalopathy). It is also used for athletic performance and cirrhosis.