What is the comparison between microneedling with GHK cu (Gly His Lys Copper) versus Platelet Rich Plasma (PRP) for treating sagging skin? EGF Serum Best for Microneedling Stem Cell Serum For Microneedling Stem Cell Serum STEMBOTANY Microneedling with GHK Cu is one of the most effective ways to stimulate collagen where your skin needs it most. The reason is simple: it's targeted. Microneedling creates micro injuries on the skin, and Microneedling with GHK Cu is one of the most effective ways to stimulate collagen where your skin needs it most. The reason is simple: it's targeted. Microneedling creates micro injuries on the skin, and