L Carnitine Benefits, Sources, and Side Effects 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 Supplements and chronic pain: What does the research say? Some studies suggest possible benefits for: Acetyl L Carnitine (energy for cells; studied in diabetic nerve pain) Alpha Lipoic Acid (antioxidant; may ease nerve pain, L carnitine tartrate supplementation in the fight against infectious disease L Carnitine L Carnitine Supplements in India Fast&Up