Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Assessing the In Vitro and In Vivo Performance of L Carnitine Loaded Nanoparticles in Combating Obesity NutraKey Health Acetyl L Carnitine L Carnitine Oral Bioavailability NOW l Carnitine Supplement PDF) Enhanced Bioavailability of L Carnitine After Painless Intradermal Delivery vs. Oral Administration in Rats 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