Meet GHK Cu, the copper peptide that regenerates and protects. It helps stimulate collagen, improves skin quality, supports hair growth, and fights inflammation for healthier, stronger skin. Contact us at 065 559 GHK Cu Copper Peptide Benefits, Uses & Safety Intra V 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 Ghk Cu Intra Nasal Spray 50 mg 0.34 oz.