patent ghk-cu hair growth study microneedling human This is what the combination of microneedling, peptides and Cu and 2400mg of GHK GHK-Cu peptide for hair: the
Description
Several other factors play a crucial role in maintaining peptide stability, even when properly refrigerated: Protection from Light: Peptides, including GHK-Cu, can be photosensitive

[DOI] [PubMed] [Google Scholar] 112.Philippi N., Vinzio S., Collongues N., Vix M., Boehm N., Tranchant C., Echaniz-Laguna A
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However, this is ingredient-level research