Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis People who live with depression have low blood levels of a specific molecule, new medical research has revealed. It's called acetyl L carnitine, and those with particularly severe, treatment resistant or childhood onset depression were Acetyl L Carnitine: Benefits, Forms, Dosing, and Side Effects Dr Brad Stanfield