Losing weight with L carnitine supplements. Yes or no? 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 L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage Will L Arginine Keep Me Awake? (L Arginine) TrimRX When to Take L Carnitine for Weight Loss: A Pro Timing Guide