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[DOI] [PMC free article] [PubMed] [Google Scholar] 79.Philippot G, Gordh T, Fredriksson A, Viberg H

Apply to clean, dry skin after cleansing, before heavier moisturizers

It's a naturally occurring copper-binding peptide first isolated from human plasma in 1973 by biochemist Loren Pickart, who noticed that older liver tissue regenerated better when exposed to plasma from younger donors

It is best to avoid it entirely during these periods

And I havent seen many worrying side effects. Still, anytime you put something in your bodywhether its a triple cheeseburger or a supplement you might wonder if there are any downsides

The current GHK-Cu FDA approval status is mainly influenced by high drug development costs, limited clinical data, formulation stability challenges, and its established role as a GHK-Cu cosmetic ingredient