Acetyl L Carnitine Superior Supplement Products Science First Designs for Health Study links depression to low blood levels of acetyl L carnitine Acetyl l carnitine deficiency in patients with major depressive disorder PNAS 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,