Taking L carnitine, will it improve endurance and recovery? 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 l carnitine: Nutrition, pathology, and health benefits ScienceDirect Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L Carnitine Benefits: A Complete Research Based Guide Are L Carnitine and L Carnosine the Same? Anti Aging Systems