L Carnitine Capsules Premium L Tartrate Formula Bulk Healthvit L Carnitine L Tartrate 500 mg Weight Loss Supplement, Fat Klaire Labs SFI Health L Carnitine Tartrate 500 mg Amino Acid Stabilized L Carnitine No Synthetic D Carnitine 60 Capsules L carnitine is effective for both fat loss and athletic performance. However, oral L carnitine has lower bioavailability and can be harmful at high doses, so it should be avoided. Even cardiologists give IV