This gap should be openly acknowledged: GHK-Cu is a promising therapy, but not yet an established standard
PLoS One 2021, 16 (9), e0256990 10.1371/journal.pone.0256990
I can do both of them
FOXO4 is a member of the broader FOXO protein family, which has preserved both structural and functional characteristics across various animal species and has long been associated with pathways influencing aging
It also means allergic reactions are unlikely, though not impossible, since any foreign substance can theoretically trigger sensitivity in susceptible individuals
However, seek immediate medical attention if you notice any symptoms such as skin rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, breathing difficulty, etc