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For many people, the most effective long-term strategy isn't choosing between these approaches but building a routine that includes both - using retinol for its proven resurfacing and gene-activation benefits, and GHK-Cu for the deeper repair work that retinol doesn't cover
Understanding the differences between these delivery methods can help you make an informed decision
One important note: if youve seen injectable GHK-Cu discussed online, be aware theres essentially very limited human clinical data supporting this route
