Male Fertility Power Pack Carnitine: the claims and why it may not work L Carnitine Attenuates Testicular Dysfunction in Type 1 Diabetes Mellitus Via Modulation of Oxidative Stress, Inflammation, and miRNA Expression Inflammation Springer Nature Link 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.