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 Subcutaneous Injection Sites and Instructions for Safe Self Administration Thermodynamically stable ionic liquid microemulsions pioneer pathways for topical delivery and peptide application ScienceDirect WO2019167070A1 Topical copper tripeptide composition and process of preparation. Google Patents We are obsessed with GHK Cu, the skin healing, collagen stimulating copper peptide that works from the inside out., This medical grade peptide helps calm inflammation, smooth fine lines, restore