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This is the study that matters most for the "before and after" question, because it used the exact demographic most GHK-Cu consumers belong to: women over 50 with real photodamage, not 25-year-olds with minor texture concerns
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Your frequency and dosing depend on your personalized protocol
However, cycling prevents potential receptor desensitization, allows natural healing integration, reflects a conservative approach given limited long-term human data, and reduces cost
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