L Carnitine Body Contouring Institute BCN Mesotherapy Serum Dermishop How To Give A Subcutaneous Injection And Sites The HCG Institute L Carnitine Intramuscular shot ELIXR IV Therapy 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 Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust