GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B If you think GHK Cu is just an expensive skin cream, we need to talk. The truth that 99% of people, and even many doctors, overlook is that this copper peptide is Time for a little GHK CU update for the people who are interested. It's day 9. I took a little break on day 5 just so my body didn't get too 'used' to Thermodynamically stable ionic liquid microemulsions pioneer pathways for topical delivery and peptide application ScienceDirect