L Carnitine Injections Nuceria Health, Miami, FL 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 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), Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link Amazon.com: NuEthix Formulations Lipsomal L Carnitine Supplement 600mg with L Citrulline 1000mg for Healthy Weight Management, Fat Metabolism, Energy Production and Increased Blood Flow, for Men & Women : Health & Household