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 I've had @sumanurica in my routine for almost a year now, so adding the new GHK Cu Repairing Serum felt like the perfect next step It's lightweight, calming and layers beautifully, especially GHK Cu Repairing Serum by SumaNurica for Women 3 x 0.33 oz Serum Walmart.com Top 4 GHK Cu Repairing Serum Ingredients SumaNurica Repair & Rejuvenate Serum Duo SumaNurica How to use GHK Cu Repairing Serum SumaNurica