Acetyl L. Carnitine Supplement Metabolics Amazon.com: Muscle Pharm L Carnitine 3000, The Ultimate Liquid L Carnitine Supplement for High Performance, Supports Metabolism, Hydration & Energy, Zero Sugar, Low Calories, Peach Nectarine Flavor, 32 Servings : Everything Else How Much L Carnitine Should I Take? A Guide The Science of Good Health What Is L Carnitine? How Could It Help With Weight Management? Wellness Hub 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