Carnitine is a compound that is found in many foods, including red meat, dairy products, and some fruits and vegetables. It is also available as a dietary supplement. The body can also produce carnitine, but some people may not produce enough to meet their needs. Carnitine is important for energy metabolism, as it helps to transport long-chain fatty acids into the mitochondria, where they can be broken down to produce energy.

Carnitine supplements are often used to improve exercise performance and increase muscle mass. It is also used to support weight loss as it helps to burn fat in the body. Carnitine is also used to support heart health, as it may help to lower levels of triglycerides and LDL cholesterol. Additionally, carnitine supplements may also improve symptoms of certain neurological disorders such as Alzheimer's disease and ADHD.