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 Carnitine has a central role in fat metabolism. During the overnight fasted state and in exercise performed at low to moderate intensity, long chain fatty acids serve as the primary energy source for L Carnitine Tablets for Energy Support Nature's Bounty Acetyl L Carnitine and Erectile Dysfunction Longchain acylcarnitine deficiency in patients with chronic fatigue syndrome. Potential involvement of altered carnitine palmitoyltransferaseI activity Reuter 2011 Journal of Internal Medicine Wiley Online Library