GHK Cu Copper Peptide Hair & Scalp Serum Copper peptide GHK Cu Wikipedia GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Most people think they need to take copper peptides. But Your body already produces its own copper peptide called GHK Cu. But levels naturally decline with age. So Instead of trying to replace