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 and heart disease ScienceDirect The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link The effect of L carnitine supplementation on blood pressure in patients with type 2 diabetes: A randomized, double blind, placebo controlled trial ScienceDirect L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage