Create your own serum! GHK Cu Repairing Serum is stored in revolutionary, two part packaging, consisting of a powder formula in the lid and a liquid solution in the base. Ive had @sumanurica in my routine for almost a year now, so adding the new GHK Cu Repairing Serum felt like the perfect next step , Its lightweight, calming and layers beautifully, especially on One of the questions we often receive about our products is: Why is the GHK Cu Repairing Serum stored in two part packaging? , GHK Cu is an unstable ingredient that can slowly lose its effectiveness Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit