For subcutaneous injections, using shorter needles (4 5mm) is the safest choice to ensure medication stays in the fatty layer and avoids muscle injury. A 4mm needle is ideal, minimizing pain while keeping Lipo C and Tirzepatide: Safety and Clinical Evidence Review Fella Health What is the Best Injection for Weight Loss? Defy Medical For subcutaneous injections, using shorter needles (4 5mm) is the safest choice to ensure medication stays in the fatty layer and avoids muscle injury. A 4mm needle is ideal, minimizing pain while keeping PCDC injections (aka Liquid Lipo) A non invasive way to dissolve stubborn fat and contour targeted areasno surgery, no downtime. Fast results. Long lasting contour. Perfect for double chin, abdomen, arms, and thighs. Injectable thermosensitive lipo hydrogels loaded with ropivacaine for prolonging local anesthesia ScienceDirect