L Carnitine L Tartrate Powder The Fat Loss Amino 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 L Carnitine 1000mg Energy, Metabolism & Fat Burning MASS Nutrex Liquid Carnitine 3000 vs L Carnitine 1000mg (L Tartrate) No They're Not The Same ! Here's Why : L Carnitine Base (Found in the Liquid) The liquid version usually uses the Base