• A constituent of STRIATED MUSCLE and LIVER. It is an amino acid derivative and an essential cofactor for fatty acid metabolism.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• A substance made in the muscle and liver tissue and found in certain foods, such as meat, poultry, fish, and some dairy products. It is used by many cells in the body to make energy from fatty acids.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• An amino acid derivative. Carnitine facilitates long-chain fatty acid entry into mitochondria, delivering substrate for oxidation and subsequent energy production. Fatty acids are utilized as an energy substrate in all tissues except the brain.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• Betaine derivative constituent of skeletal muscle and liver; required for mitochondrial beta oxidation of fatty acids; used therapeutically to stimulate gastric and pancreatic secretions and in the treatment of hyperlipoproteinemias.
  CRISP Thesaurus
  National Institutes of Health, 2006