Acetyl L Carnitine: Benefits, Forms, Dosing, and Side Effects Dr Brad Stanfield Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get 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 Force Factor Acetyl L Carnitine by Force Factor: Lowest Prices at Muscle & Strength