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 Benefits for Male Erectile Dysfunction The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link L carnitine tartrate supplementation in the fight against infectious disease L Carnitine Benefits for Male Erectile Dysfunction L Carnitine and Male Fertility: Is Supplementation Beneficial?