L-carnitine is very similar to the nonessential amino acid carnitine. It
performs some of the same functions, such as helping metabolize food
into energy. L-carnitine is synthesized in the body from the amino acids
lysine and methionine. L-carnitine transfers long-chain fatty acids,
such as triglycerides into mitochondria (a cell's energy powerhouse),
where they may be oxidized to produce energy. L-carnitine is a very
popular supplement that promotes muscle growth and development. It is
also used for fat-burning, increasing energy, and improving resistance
to muscle fatigue.
