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GHK-Cu is a copper-binding tripeptide (Gly-His-Lys complexed with copper), one of the most studied peptides in skin, collagen and tissue-remodelling research

Because of the known association of claudin-2 with epithelial leakiness/permeability, increased claudin-2 expression has been suggested to promote mucosal inflammation

A meaningful share of what users describe as "side effects" actually stems from other ingredients in the serum preservatives, fragrances, solvents, or high concentrations of exfoliating acids rather than the copper tripeptide in isolation

So, if you're trying to transform your body composition by gaining muscle, BPC 157 could help you speed up that process

GHK-Cu is one of the most studied peptides in cosmetic science

While this guidance was directed primarily at hormone therapy, its underlying principle, preferring approved therapies when available, applies to the broader compounded peptide space