L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage The benefits and Side Effects of Carnitine and CoQ10 Supplementation f Levocarnitine Tablets (330 mg) Levocarnitine Oral Solution (1 g 10 mL multiple unit container) Levocarnitine Oral Solution (Sugar Free) (1 g 10 mL multiple unit container) For oral use only. Not for parenteral use. 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 (ALCAR) Supplement for Horses Mad Barn L Carnitine. The unsung hero to support workout and recovery, supports heart health, and metabolism.