L Carnitine Vitamin Supplement for Energy and Metabolism Boost Acetyl L Carnitine 1500mg, Brain Function, Fat Metabolism, Energy Production Acetyl L Carnitine is more thought of as a fat burner. It's actually powerful tool for athletes looking to improve endurance, energy, and mental performance. Here's how you can integrate it into your routine for What is carnitine? Carnitine is produced in the body from the amino acid lysine and naturally occurs in some foods. It supports energy metabolism and muscle function, which are important factors in