Most oral L carnitine supplements are glorified flavored chemical waters., , Low bioavailability = very little of it actually gets picked up for use by the body., , So when companies sell $40$60 Fast&Up L Carnitine 3000 mg Triple Action Formula for Faster Fat Burn Relative Bioavailability of Carnitine Supplementation in Premature Neonates Kinetics of carnitine concentration after switching from oral administration to intravenous injection in hemodialysis patients