Exome sequencing identifies primary carnitine deficiency in a family with cardiomyopathy and sudden death European Journal of Human Genetics Supplement of the week: L Carnitine! This one doesn't just boost fat metabolismit can also improve recovery, endurance, and even brain function. If you're serious about performance and longevity, this might be L Carnitine Benefits, Sources, and Side Effects What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of