Is creatine supplementation safe for renal (kidney) function? 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. 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. Mechanism of L carnitine deficiency in maintenance hemodialysis Download Scientific Diagram