When to take L carnitine: Dosage, forms, and side effects 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 How Much L Carnitine Per Day: Dosage Tips and Benefits L Carnitine 3000 Amazon.com: Green Organic Supplements Acetyl L Carnitine, Carnitine, ALC, 90 VCaps, High Absorbable, Non GMO, Gluten Free (Single) : Health & Household Nutrex Research L Carnitine 1000 Fat Metabolism Energy Support 120 Capsules