Carnitine: the claims and why it may not work 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 Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Lypo Spheric Acetyl L Carnitine HSN L Carnitine Tartrate 3000 mg per Daily Dose High Bioavailability Vegan 120 Veggie Capsules : Amazon.ae: Health