L Carnitine Injection at 8000 piece L Carnitine IV Injection in Belgaum ID: 2851546498373 Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust Product Spotlight! L Carnitine injections infusions and the benefits thereof! 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