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 GHK Cu Repairing Serum by SumaNurica for Women 3 x 0.33 oz Serum Walmart.com GHK Cu Repairing Serum 30ml SumaNurica 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