L Carnitine Oral Bioavailability NOW l Carnitine Supplement L Carnitine injection is recommended at 1 ampule every 2 3 days for best results. The L Carnitine is taken intravenously either by normal injection or using a butterfly needle. After taking this L Carnitine, you L carnitine is an amino acid derivative that plays a crucial role in the bodys energy production processes. As an injectable supplement, L carnitine has been employed to support various health L Carnitine Injection 100ml CanadaVet L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe