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, 500 mg, 30 Vegetarian Capsules The Right Way to Take L Carnitine to Boost Your Training L Carnitine 500 mg Fat metabolism Avril l Carnitine pretreatment ameliorates heat stress induced acute kidney injury by restoring mitochondrial function of tubular cells American Journal of Physiology Renal Physiology American Physiological Society