You can over do anything, but GHK is a naturally occurring copper peptide complex.
Copper peptides are always naturally present in the skin and there are higher levels of it when the skin has been damaged which triggers repair. Products containing Copper Peptides (CPs) are a way of introducing this function topically and using the natural process of healing to accelerate skin renewal. In tests copper peptides have been shown to; remove damaged proteins and collagen and stimulate the production of new GAGs (water holding proteins), elastin and collagen. CPs are also both anti-inflammatory and a potent anti-oxidant so skin improvements should be achieved without the kind of skin barrier irritation typically experienced when using retinoids or AHAs. The long-term result should be thicker, firmer skin with better moisture retention and (maybe) a reduction in wrinkles. This process is often referred to as Ďremodelingí.