L-carnitine is a naturally occurring amino acid derivative that plays a crucial role in energy production. It is synthesized in the body from the amino acids lysine and methionine and is also obtained from dietary sources, particularly meat and dairy products. L-carnitine is essential for the transport of long-chain fatty acids into the mitochondria, where they are oxidized to produce energy.

Beyond its primary function in fatty acid metabolism, recent research has highlighted L-carnitine's involvement in various physiological processes, including cellular energy balance, neuroprotection, and muscle function. These functions make L-carnitine a critical component in overall metabolic health and physical performance.

Given its role in energy metabolism and cellular health, L-carnitine has been investigated for its potential benefits in various health conditions, including cardiovascular diseases, muscle disorders, and neurodegenerative diseases. It is also explored for its possible therapeutic effects in Autism Spectrum Disorder (ASD).