Protocol for Life Balance L Carnitine 500 mg 60 Veg Caps Walmart.com L Carnitine. The unsung hero to support workout and recovery, supports heart health, and metabolism. 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 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.