mixing ghk cu with hyaluronic acid 2% + GHK-Cu (Serum) locking ingredients that help prevent water from escaping the skin barrier DIY GHK-Cu Face Serum with

Preferably at least 90 % of copper peptide is released over 24hrs

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The concern isn't copper per se but rather the uncertainty about how supplemental copper peptides might affect a developing fetus or nursing infant

FDA had previously identified a range of potential safety considerations associated with these substances, including risks related to immunogenicity, peptide-related impurities, and, in some cases, limited human exposure data

It is used in clinical research to study fertility and sexual function

I felt a little light-headed and my chest and arms felt warm like when you drink whiskey