Supplement of the week: L Carnitine! This one doesn't just boost fat metabolismit can also improve recovery, endurance, and even brain function. If you're serious about performance and longevity, this might be Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis L Carnitine Powder 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 Spring Valley L Carnitine Amino Acid Dietary Supplement Tablets for Heart Health, 500 mg, 30 Count HSA FSA Eligible Walmart.com