Acetyl l Carnitine in the Treatment of Peripheral Neuropathies: A Narrative Review Pain and Therapy Springer Nature Link Acetyl L Carnitine Powder (ALCAR) Pure Product Australia Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn 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.