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 Full article: l Carnitine conjugated chitosan stearic acid polymeric micelles for improving the oral bioavailability of paclitaxel Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link B6 vs B12 vs Niacinamide vs Gylcine vs L Caritine vs etc. : r tirzepatidecompound JCI l Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans