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 Acetyl L Carnitine Study NOW Foods JCI l Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans B6 vs B12 vs Niacinamide vs Gylcine vs L Caritine vs etc. : r tirzepatidecompound