Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis Carnitine supplementation improves insulin sensitivity and skeletal muscle acetylcarnitine formation in patients with type 2 diabetes Op den KampBruls 2025 Diabetes, Obesity and Metabolism Wiley Online Library L Carnitine has become one of our top 5 sellers the last few years and when you review the research, you can see why. L carnitine is a supplement probably more well known if Hypertension and Insulin Resistance Hypertension Carnitine supplementation improves metabolic flexibility and skeletal muscle acetylcarnitine formation in volunteers with impaired glucose tolerance: A randomised controlled trial eBioMedicine