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Because no human trials exist, every human-use report is anecdotal
Copper Peptides (GHK-Cu) for Skin Longevity: Topical vs Injectable Skin aging isnt just cosmeticit reflects changes in collagen production, inflammation, cellular repair, and overall longevity
Alternatively, plateaus may indicate reaching the limits of what GHK-Cu alone can achieve for your situation
Both are short peptides studied in neuro and circadian-adjacent research, but they differ chemically
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