I am sure either Jessica or Dr. Pickart will answer this more fully in the future, but supplementing with copper will not increase GHK in our bloodstream. Supplementing copper is great for health benefits (check out our forum about copper and disease.) but does not affect the amount of GHK Copper in the blood.
Although related, those are two separate things.
What would be needed is a supplement of GHK Copper. This does not exist at the moment. Dr. Pickart would love to have this be a daily supplement. He hopes one day it will come in the future.