Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis Carnitine Wikipedia Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota 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 Bandini L Carnitine 3000, 180 Capsules with Carnipure High Dose, Sports Supplement with L Carnitine Tartrate, Pure Carnitin with High Absorption and Bioavailability, Vegan and No Additives : Amazon.com.be: Health & Personal Care