Noninvasive and Efficient Peptide Delivery by a Novel Biocompatible Ionic Liquid ACS Sustainable Chemistry & Engineering 7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening. GHK Cu suppressed the activation of the p38 MAPK signaling pathway in Download Scientific Diagram 7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening.