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Health Canada has issued public advisories on unauthorized injectable peptide products, with GHK-Cu named explicitly on the list of seized substances

Persistent redness affecting the entire face uniformly suggests systemic copper accumulation rather than localized irritation

As a peptide that declines with age and intersects with many well-established longevity pathways, it stands to have significant effects on age-related decline - Cardiometabolic health: Research suggests improvements in several markers associated with metabolic syndrome, but more studies are required regarding cardiovascular outcomes in humans

Topical reactions: rare irritation , redness or dryness , especially at 3 %+ percentages on sensitive skin