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PubMed The human peptide GHK-Cu in prevention of oxidative stress and degenerative conditions of aging Anchor review for copper peptide gene-expression and tissue-repair claims
Track three milestones: smoother texture by week 4, lighter sun spots by week 8, more even overall tone by week 12
WI: Formal analysis, Investigation, Writing original draft, Data curation, Software, Validation, Methodology
A 2026 review of 194 studies found oral and topical forms helped with pigmentation, brightness, and hydration
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