L carnitine low bioavailability . oral L carnitine 5% Bioavailability of dietary carnitine. Download Scientific Diagram Amazon.com: Lypo Spheric Acetyl L Carnitine 1,000 mg Acetyl L Carnitine & Essential Phospholipids Per Packet Liposome Encapsulated for Maximum Bioavailability 100% Non GMO (30 Individual Packets) : Health & Household 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