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Side effects are rare and typically minimal
Injectable GHK-Cu is increasingly used in scalp-injection protocols alongside other hair-loss peptides
But that connection is indirect, untested in patch form, and nowhere close to replicating what prescription GLP-1 receptor agonists like semaglutide or tirzepatide do
Hypoxia, DNA repair and genetic instability
Substantial weight regain typically occurs over longer periods (months to a year) rather than within a single month
Cagrilintide adds amylin signaling, but there is no direct trial comparing the combination with retatrutide alone
