3 Reasons Acetyl L Carnitine Supports Cognitive Health HealthyHey What is carnitine? Carnitine is produced in the body from the amino acid lysine and naturally occurs in some foods. It supports energy metabolism and muscle function, which are important factors in L Carnitine Linus Pauling Institute Oregon State University Signs & Symptoms of L Carnitine Deficiency Acetyl L Carnitine Core Nutritionals Study links depression to low blood levels of acetyl L carnitine