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Shampoo first to cleanse the scalp, then conditioner on the mid-lengths and ends, then GHK-Cu Hair Serum onto the clean scalp as the leave-on step
While most reported toxicity cases have been associated with industrial accidents and manufacturing errors, it is important to at least be aware of the symptoms of selenium toxicity
I was skeptical at first since I had never used peptides before
This suggests that excessive GHK-Cu (or other copper peptides) might theoretically push skin MMP-1 concentrations beyond levels supporting healthy collagen production into ranges associated with collagen fragmentation and breakdown seen in older skin with naturally elevated MMP-1
Despite this heterogeneity, convergence of biochemical, molecular, and histological endpoints strengthens the translational relevance of the findings