The adverse effects of long term l carnitine supplementation on liver and kidney function in rats L Liu, D M Zhang, M X Wang, C Y Fan, F Zhou, S J Wang, L D Kong, 2015 L Carnitine: Benefits, Side Effects & Dosage BulkSupplements.com If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. Glycine Propionyl L Carnitine & ED : Benefits, Effects & Uses Allo Health Blog 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 Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe