Role of carnitine in disease Nutrition & Metabolism Springer Nature Link L Carnitine: Benefits, side effects, and dosage 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 Role of L carnitine in female infertility Reproductive Biology and Endocrinology Springer Nature Link L Carnitine Side Effects & Risks