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. 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 LeanShots Liquid L Carnitine Shot (3000mg) NutraBio Brands L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health