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They can be used as carriers of both hydrophobic and hydrophilic substances, such as the anti-aging and wound-healing copper-binding peptide, GHK-Cu (glycyl-L-histidyl-L-lysine)

Nature Scientific Reports 2016 comparative study showed GHK-Cu produced no cytotoxicity to human keratinocytes at concentrations up to 5,800 M over 72 hours and did not induce inflammatory biomarkers unlike other copper compounds

This is normal and does not indicate a problem

This matters because it shifts microneedling from being seen as an "optional extra" to being recognised as a primary treatment option for androgenetic alopecia