Carnitine Blend Rootcology Effects of Oral L Carnitine Administration in Narcolepsy Patients: A Randomized, Double Blind, Cross Over and Placebo Controlled Trial PLOS One 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 The leading ingredient in any energy drink is usually caffeine. Most of them contain herbs, caffeine, and other substances. Many energy drink brands claim to be supplements. The FDA doesn't approve energy