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. 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 Amazon.com: Renal Replacement Therapy Complete Multi Vitamin 60 Capsules, 30 Day Supply, B Complex, Antioxidant Vitamin C& E, L Carnitine & Zinc Immune, Skin, Red Cell, & Muscle Health Support Kidney Supplement : 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