Acetyl L Carnitine vs L Carnitine: 4 Key Differences Momentous What is carnitine? Carnitine is produced in the body from the amino acid lysine and naturally occurs in some foods. It supports energy metabolism and muscle function, which are important factors in Acetyl L carnitine physical chemical, metabolic, and therapeutic properties: relevance for its mode of action in Alzheimer's disease and geriatric depression Molecular Psychiatry Carnitine Deficiency an overview ScienceDirect Topics The carnitine system and cancer metabolic plasticity Cell Death & Disease