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J Immunol 183 : 46014608 Fitzpatrick AM, Holguin F, Teague WG, Brown LA 2008 Alveolar macrophage phagocytosis is impaired in children with poorly controlled asthma

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PMID 26259712

Topical protocol guidance Apply GHK-Cu serum or cream once to twice daily, to clean dry skin For anti-aging use: apply after cleansing, before moisturizer Allow 15-20 minutes before applying other actives Best results typically emerge after consistent use over 8-12 weeks Do not combine in the same session with strong vitamin C serums, AHAs, or retinoids Post-procedure use: apply after microneedling, laser, or peel procedures as directed by the provider Injectable protocols general reference Safety profile of GHK-Cu GHK-Cu has one of the best safety profiles of any peptide studied for aesthetic and regenerative use