Interestingly, the benefits of GHK-Cu appear to extend beyond simply increasing hair number to improving the structural quality of existing hairs
Nat Cell Biol 11(11):13051314
(Isolated vitamin B12 deficiency is very rare)
The skincare industry has embraced GHK-Cu with considerable commercial enthusiasm, incorporating it into serums, creams, masks, and microneedling treatments at concentrations ranging from 0.01% to 1%
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