How to use GHK Cu Repairing Serum SumaNurica SumaNurica Skincare Backed By Science. SumaNurica GHK Cu Repairing Serum by SumaNurica for Women 3 x 0.33 oz Serum Fresh Beauty Co. New Zealand 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 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