dihexa peptide overview Therapy: Brain & Memory Support Dihexa - Wikipedia

Shelf life: 24 months from the manufacture date, properly stored, in a sealed container

A large number of websites still sell GHK-Cu as a research chemical or for research use only in lyophilized powder form

The copper component is essential for activity - copper is a critical cofactor for numerous enzymes involved in collagen cross-linking (lysyl oxidase), antioxidant defense (superoxide dismutase), wound healing, and tissue remodeling, and GHK functions as a highly effective copper delivery system that facilitates copper uptake into cells and tissues where it can support these essential enzymatic processes

S2CID 19818372

It also depends on how well the person responds to treatment and their overall health

What peptides influence metabolic health