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Across the usual run of cell-counting, MTT, and BrdU assays, fibroblast proliferation tends to rise by something like 15% to 40% over untreated cells

That is a mechanistically attractive claim, and the pathway itself is unquestionably central to hair biology but the strength of the direct evidence tying GHK-Cu specifically to Wnt activation in human follicles is weaker than the confident phrasing online implies, and much of it is filtered through commercial rather than primary literature

If you are prone to melasma, keep sun exposure low and ask a clinician before heat-based procedures

Some suggest injecting deeper, which actually made it worse for me

Interior shelves maintain more consistent temperature