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In dermatological contexts, the most clinically relevant gene targets include: COL1A1 and COL3A1 upregulation increases procollagen type I and III synthesis, directly counteracting age-related collagen depletion

This ingredient has been deemed safe up to 2% in shampoo, 1% in cleansers, and 0.1% in face cream by the EU's Scientific Committee on Consumer Safety (SCCS)

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Delicate areas such as under the eyes require shallow depths, while thicker areas like the cheeks may tolerate slightly deeper penetration

minoxidil, 1993: A small double-blind trial found that a topical GHK-Cu solution produced hair density improvements comparable to 5% minoxidil over 6 months in men with androgenetic alopecia