L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Acute L Carnitine Supplementation Does Not Improve CrossFit Performance: A Randomized, Double Blind, Placebo Controlled Crossover Study 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 L Carnitine: Benefits, side effects, and dosage The effects of pharmacologically decreased availability of L carnitine Download Scientific Diagram