How to Self Administer Subcutaneous & Intramuscular Injections Weight Loss: Grayhawk Medical Group, PLLC: Family Practice L Carnitine Injection (Intramuscular): How It Works & What to Expect Mesotherapy Cocktails, Exosomes Regenerative Skin Boosters Where to Inject L Carnitine for Maximum Fat Loss Benefits 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 Issue 13: IMCAS 2025 RESEARCH POSTER: L Carnitine Subcutaneous Injection After HIFU for Local Fat Reduction: a Case Study Suisselle