L Carnitine L Tartrate: 8 Key Benefits Dr. Lam Role of L carnitine in exercise training: Anti inflammatory, antioxidant, and metabolic interactions ScienceDirect L CARNITINE increases muscle mass, reduces fat mass. Bangkok Hospital Headquarter 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