ghk cu beard does grow facial hair GHK-Cu Copper Peptides (GHK-Cu) & Beard

Our results indicated that neither GHK nor GHK-Cu showed cytotoxic activity at the range of concentrations tested while CuCl 2 and Cu(OAc) 2 showed substantial cytotoxicity to the HaCaT cells at the highest concentration assayed, i.e., at 5800 M, after 30 mins treatment

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Zitvogel, L., Pietrocola, F

The prudent framing is that systemic copper delivery is a variable that topical use largely avoids, and that anyone with impaired copper regulation faces a categorically different risk calculus which brings us to safety