L Carnitine 500mg by Lifeplan starting at 14.49 60 Capsules L Carnitine is an amino acid, needed for protein synthesis, which can be produced by the body. As the body cannot produce L Carnitine is one of the most hyped weight loss supplements online but here's what most won't tell you: Your body naturally produces L Carnitine using amino acids l, and a healthy person L Carnitine, 500 mg, 60 Veg Capsules L Carnitine Tablets for Energy Support Nature's Bounty L Carnitine 500mg Nature's Bounty L Carnitine Amino Acid Supplement, 500 mg30 caplets 1 Each