Copper Tripeptide 1 (GHK Cu): The Premier Anti Aging Ingredient for Skincare Formulators Titan Biotech Ltd. 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 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 GHK Cu Repairing Serum 0.99fl. oz 30ml SumaNurica SumaNurica 3 x 0.33 oz GHK Cu Repairing Serum 3 Piece