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By helping address visible signs of collagen decline while promoting a more sculpted look, it supports smoother, firmer-looking skin and more defined facial contours
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
They no longer fit melanocortin receptors and cannot trigger the intended signaling cascade
JCO Oncol Pract 16(7):383-388, 2020
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