Frontiers Exogenous L carnitine Administration Ameliorates the Adverse Effects of Heat Stress on Testicular Hemodynamics, Echotexture, and Total Antioxidant Capacity in Rams 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 Mounjaro: Safety and Interactions Explained Bolt Pharmacy Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust How to Self Administer Subcutaneous & Intramuscular Injections