Difference between L Carnitine and L Carnitine L Tartrate L Carnitine is an amino acid that plays a role in energy production, by helping transport fatty acids into the mitochondria. Mitochondria are tiny powerhouses within cells that make energy. Comparison of the Effects of lCarnitine and AcetyllCarnitine on Carnitine Levels, Ambulatory Activity, and Oxidative Stress Biomarkers in the Brain of Old Rats LIU 2004 Annals of the New Carnitine Synergy Superior Supplement Products Science First Designs for Health Nature's Lab Coq10 + Alpha Lipoic Acid + Acetyl L Carnitine HCL 60 Capsules GNC Acetyl L Carnitine Core Nutritionals