Frontiers L Carnitine and Acetyl L Carnitine: Potential Novel Biomarkers for Major Depressive Disorder 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, Short chain carnitines in adolescent major depressive disorder: Associations and biomarker potential ScienceDirect Amazon.com: Life Extension Acetyl L Carnitine, Acetyl L Carnitine, Vitamin C, Brain, Mood & Nerve Health, Cellular Energy, 3 Month Supply, Gluten Free, Non GMO, Vegetarian, 100 Capsules : Health & Household Acetyl L Carnitine Core Nutritionals