L Carnitine Linus Pauling Institute Oregon State University Austin Hodges IFBB PRO L Carnitine is often marketed as a fat burner, but most people don't realize that oral and injectable L Carnitine are not the same. . Oral Instagram L Carnitine is often marketed as a fat burner, but most people dont realize that oral and injectable L Carnitine are not the same..Oral L Carnitine has poor absorption (only 20% bioavailability), B6 vs B12 vs Niacinamide vs Gylcine vs L Caritine vs etc. : r tirzepatidecompound