ALCAR Supplement for Cognitive Function and Stamina Liquid L Carnitine CoQ10 16 fl oz Dr.'s Advantage Blue Sky Vitamin Super Strength L Carnitine 1000mg Servings Plus Calcium by Arazo Nutrition What Is CoQ10 and L Carnitine, and How Can It Change Your Life? iThrive Essentials 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