L-carnitine, a compound present in almost all cells in the body, helps in the process of metabolizing fatty acids into energy. L-carnitine is chemically similar to an amino acid, and is manufactured in the liver and kidneys from the amino acids L-lysine and L-methionine. L-carnitine is naturally occurring in many animal source foods and a few plant source foods such as avocado.
Because L-carnitine is primarily manufactured in the liver and kidneys, supplementation of the compound in those with liver or kidney disease may be necessary due to impaired L-carnitine synthesis. Studies are being conducted on the benefit of acetyl-L-carnitine (produced in the brain) to those with Alzheimer’s disease. These studies are promising, but more research is needed. There is conflicting research as to the benefit of L-carnitine on exercise performance and obesity. Most promising is the advantage L-carnitine may provide to endurance athletes. More research is needed.
Use as directed. Dosages vary; general recommended dosage is 500-1000mg, 2-3 times per day. Supplement can be taken with or without food. L-carnitine is available in capsule, liquid, and tablet form. Amino acids are often given a prefix of L- or D-. Choose L-carnitine, as it is most similar to the compound produced in the body.