NOW Foods Acetyl L Carnitine, Cognitive Support, Vegetarian Supplement, 500 mg, 100 Capsules Walmart.com L carnitine 500 mg food supplement from vitaworld 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 BSM Partners Recent paper review L carnitine and betaine supplementation