Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications 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 Benefits of L Carnitine for PCOS Landys Chemist Role of carnitine in disease Nutrition & Metabolism Springer Nature Link