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 Cambridge Isotope Laboratories L CARNITINE:HCL, O PALMITOYL (N METHYL D3, Fisher Scientific How to Take L Carnitine Correctly to Boost Your Training Bodybuilding.com Injectable l carnitine has 100% bioavailability and it's a supplement, not steroid. Even as a natty you can use and it can also help you in your bulking process, not just in fat Carnitine octanoyltransferase is important for the assimilation of exogenous acetyl L carnitine into acetyl CoA in mammalian cells Journal of Biological Chemistry