Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn What is the role of carnitine (L carnitine) in the management of heart failure? L Carnitine: Benefits, side effects, and dosage 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 l Carnitine and heart disease ScienceDirect