L Carnitine Injection Clinica IDEAL Harwin Subcutaneous Injection Technique Guide Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust L Carnitine Injection VolusiaMedicalCenter Intramuscular vs. Subcutaneous Injections: What's the Difference? Intramuscular (IM) shots go deep into the muscle for faster absorption, while subcutaneous (SubQ) injections are placed just under the skin for slower, more sustained Compounded Carnitine (L) Injection Empower Pharmacy