While GHK Cu may not be a widely recognized compound, its presence and function within the human body are well established. GHK Cu (Copper Peptide) is endogenously produced and plays a role in various physiological GHK Copper Peptide GHK Cu Tripeptide 1 GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B The disordered p53 transactivation domain is the target of FOXO4 and the senolytic compound FOXO4 DRI Nature Communications