GHK-Cu Copper Peptide Amino Complex before or after a treatment. It's no secret that GHK-Cu Copper Peptide is the best and most coveted treatment product to use when Dermarolling or Microneedling; and people want a clean formula, which is why they use mine. I've been reading about dermarolling/microneedling for over 10 years, but I've recently taken up a new interest in it and have been researching and speaking with professionals A LOT - and here's why: I was very surprised to learn that the microholes caused by the needles close up 60-90 minutes after treatment. I.did.not.know.this! This knowledge changes everything for me; I'm jumping onto the band wagon and going to give it a go myself.