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Discard any vial showing signs of contamination, damage, or after 28 days of first use, whichever comes first
P.SandersJ
doi: 10.1007/s10753-025-02295-4 182 SongYGuoFZhaoYYMaXJWuLNYuJFet al
Acta Biochim Pol
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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