Acetyl L Carnitine for Heart, Diabetes & Kidney Health Kidney Coach Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis The effects of L carnitine on renal function and gene expression of caspase 9 and Bcl 2 in monosodium glutamateinduced rats BMC Nephrology Springer Nature Link Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window