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, Exploring Zn(II) Acetyl l carnitine complex for simultaneous management of depression, chronic pain, and neuroprotection ScienceDirect Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Acetyl L carnitine in chronic pain: A narrative review ScienceDirect How Acetyl L Carnitine Works HowStuffWorks