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In simple terms, the observed cosmetic changes (fewer wrinkles, tighter skin, stronger hair) match what GHK-Cus biology would predict
doi:10.1016/0005-2728(83)90122-6 Mikes V, Yaguzhinskij LS
Desquamation depends on enzymes that break apart dead cells
At the same time, it also boosts the effectiveness of other preservatives , such as the nowadays super commonly used phenoxyethanol
It contains a preservative that actively inhibits bacterial growth, dramatically extending the solution's usable life
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