Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Effects of Oral L Carnitine Administration in Narcolepsy Patients: A Randomized, Double Blind, Cross Over and Placebo Controlled Trial PLOS One Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health