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, Amazon.com: aSquared Nutrition Acetyl L Carnitine 1000mg Per Serving Max Strength 200 Veggie Capsules High Dosage Acetyl L Carnitine HCL (ALCAR) Supplement Pills to Support Pure Energy, Brain Function : Health Acetyl L Carnitine Confident Health 3 Reasons Acetyl L Carnitine Supports Cognitive Health HealthyHey The Rockefeller University Lack of a single molecule may indicate severe and treatment resistant depression