L Carnitine Dietary Supplement Therapy Weight Loss Vitality 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 A Pilot Clinical Trial on L Carnitine Supplementation in Combination with Motivation Training: Effects on Weight Management in Healthy Volunteers A Pilot Clinical Trial on L Carnitine Supplementation in Combination with Motivation Training: Effects on Weight Management in Healthy Volunteers