Perhaps the most commonly asked about question when it comes to GHK Cu is THE BURN. Let's learn! @summitrejuvenation The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference