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GHK-Cu is available in topical serums, injectable solutions, or microneedling-compatible gels
GHK-Cu was not cytotoxic and did not induce any significant change in the expression levels of various skin irritation-related biomarkers
Plasma glutathione levels, oxidative stress markers (8-OHdG, F2-isoprostanes), inflammatory markers (CRP, IL-6), and symptom history inform supplementation relevance
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