L Carnitine Deficiency Archives Govinda Lifecare Acetyl l carnitine deficiency in patients with major depressive disorder PNAS Carnitine: the claims and why it may not work Understanding L Carnitine Deficiency and Its Side Effects If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.