The copper peptide shilled as a pathway to Korean glass skin...
I have used it daily at around 3mg for the past 9 months. I have noticed faster hair / nail growth, perhaps improved skin quality although other factors have been in play (accutane, hgh, tretinoin cream) nothing crazy.
I like it, it isn't a miracle but worth taking in my opinion. Probably will have a more noticeable impact for older people that have already seen reduced collagen synthesis etc.
The impact on hair is definitely stronger than on the skin.