How to Self Administer Subcutaneous & Intramuscular Injections Injectable L carnitine vs oral? For me, absorption, fewer GI issues, & energy performance gains make injections the winner. #LCarnitine #Injectable #Bioavailability #MetabolicHealth #EnergyBoost Injectable L Carnitine: Does It Really Work for Fat Loss? 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 Injectable L carnitine works better than oral because it goes straight into your bloodstream, giving almost 100% of absorption versus only 518% with capsules or liquid. , Oral L carnitine can take Injectable L Carnitine for Slimming: Does It Really Work? National Medical Resources Inc