L-Carnitine Is A Non-Essential Amino Acid That Helps To Maintain Overall Good Health By Facilitating The Transfer Of Fatty Acid Groups Into The Mitochondrial Membrane For Cellular Energy Production.* It Naturally Occurs In Red Meat And Other Animal Source Foods, But We Recommend Supplementation To Obtain Optimal Levels Of This Excellent Amino Acid. Now® L-Carnitine Is The Purest Form, Clinically Tested, And Vegetarian (Non-Animal Sourced).