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 Swanson Propionyl L Carnitine 515mg + Glycine 60 Veggie Caps Walmart.com 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 Dont waste money on supplements like L carnitine. First focus on your diet and training. Also, oral L carnitine has low bioavailability. Injectable forms may absorb better, but diet and training