Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust Intramuscular Syringes (30 ct.) IV Me Now FL Where to Inject L Carnitine for Maximum Fat Loss Benefits 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 Subcutaneous Syringes (30 ct.) IV Me Now FL