GHK has a potential for treating several diseases and in all the research on the molecule, no negative actions have ever been reported. But I doubt if it will ever used in the USA because of its low cost. Think of the new $1,000 a day drug for the treatment of hepatitis C of the liver. The best possibility is that it be used as a nutritional supplement and encapsulated in liposomes for oral use. It should fit the legal definition of a nutritional supplement.
But GHK may be used in countries where the is less control by large corporations and much lower drug costs.
There is huge hostility to this work, even though results have been reported from about 100 laboratories, from the US government and many academic researchers. I really don't know why, I think at times that they want all of us to die in pain, misery, and poverty.