L Carnitine has become one of our top 5 sellers this year and I can see why when looking at all the research that has come out about it over the last few L carnitine exerts a nutrigenomic effect via direct modulation of nuclear receptor signaling in adipocytes, hepatocytes and SKMC, demonstrating its nutritional impact ScienceDirect L carnitine tartrate supplementation in the fight against infectious disease Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis Carnitine supplementation improves metabolic flexibility and skeletal muscle acetylcarnitine formation in volunteers with impaired glucose tolerance: A randomised controlled trial eBioMedicine