In terms of fat burning ability.. L Carnitine may not be the brightest star in the sky, but it has another effect that few people actually know about. This content is for educational The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link Acetyl L Carnitine is more thought of as a fat burner. It's actually powerful tool for athletes looking to improve endurance, energy, and mental performance. Here's how you can integrate it into your routine for Systemic regulation of L carnitine in nutritional metabolism in zebrafish, Danio rerio Scientific Reports