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Immunity 40:248261

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However, research-grade GHK-Cu at higher concentrations particularly injectable forms provides significantly greater bioavailability and gene modulation than cosmetic formulations

These users report appreciating treatment benefits while active but watching improvements gradually fade over months post-discontinuation, with timeline showing first 2 months maintaining most benefits creating initial optimism, months 2-4 showing noticeable decline returning toward baseline, months 4-8 continuing regression approaching pre-treatment status, and stabilization occurring 60-80% back toward original baseline with only modest long-term improvement retention