L Carnitine, 500 mg Veggie Capsules Jarrow Formulas Acetyl L. Carnitine Supplement Metabolics 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 L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Supplements don't replace the workbut they can support it L Carnitine helps your body turn fat into usable energy, so you can push harder and recover better. Consistency first. Supplements second. Results