Acetyl L Carnitine Mark Hyman, MD The Rockefeller University Lack of a single molecule may indicate severe and treatment resistant depression Preventive Role of L Carnitine and Balanced Diet in Alzheimer's Disease Acetyl L Carnitine Confident Health Could a mitochondrial metabolite known as acetyl L carnitine (LAC) yield a new biomarker for depression and potential new therapies? Dr. Carla Nasca, an @nyugrossman assistant professor of psychiatry and of neuroscience and physiology,