Total L Carnitine food sources (per 100 gm), Non vegetarian:, Beef steak, cooked: 56 162 mg (depending on cuts and cooking), Ground beef, cooked: 75 86 mg, Pork, cooked (100 gm): 25 61 mg, Mutton NOW Supplements, Purest Form L Carnitine 500mg, Amino Acid, Fitness Support, 180 Veg Capsules Walmart.com NOW Supplements, L Carnitine 1,000 mg, Purest Form, Amino Acid, Fitness Support* 100 Tablets What is Carnitine? What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of IMPORTANCE OF BEEF Beef is an important part of a healthy diet. It contains a fair amount of fat, but it is also a concentrated source of protein, vitamins, and minerals.