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Topical Dosage Topical GHK-Cu is the most accessible and extensively studied form: Face & neck: 24% concentration, applied once or twice daily
doi: 10.1016/j.nbd.2019.104495 136 LafonP.-A.ImberdisT.WangY.TorrentJ.RobitzerM.HuetterE.et al
10.1002/pmic.200500317 24 ChenI
European Journal of Clinical Nutrition, 72 (1), 105
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