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does ghk cu shrink pores GHK-Cu for Skin: SIGNAL's Guide to Rejuvenation Reducing Redness & Inflammation with
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[DOI] [PubMed] [Google Scholar] 44.Elsworth JD, Glover V, Reynolds GP, Sandler M, Lees AJ, Phuapradit P, Shaw KM, Stern GM, Kumar P

It remains effective in water-based serums, emulsions, and gels when stored under recommended conditions (cool, dark environments)

While the meta-analysis did not identify a single "best" depth, the most commonly studied clinical depth is 1.01.5 mm

That is the traditional medical approach
Yamanaka, T
Feb 1;26(5):683700