L Carnitine Oral Bioavailability NOW l Carnitine Supplement Frontiers L carnitine prevents lenvatinib induced muscle toxicity without impairment of the anti angiogenic efficacy Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota 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 Injectable carnitine vs oral version comparison?