Acetyl L Carnitine 500 mg L Carnitine Protocol for Life Balance 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. High Strength Liquid L Carnitine 5000 Mg, 16 Oz (473 ML) 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