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However, if you have sensitive skin or any known allergies, it's recommended to do a patch test before regular use

[PubMed] [Google Scholar] 95.Kuznik B.I., Pateiuk A.V., Baranchugova L.M., Rusaeva N.S

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An experiment in murine models examined GHK's impact on lipopolysaccharide-induced lung inflammation

Higher doses produce increased incidence and severity of gastrointestinal symptoms, which explains why clinical protocols use gradual dose escalation starting at 0.25 mg weekly and incrementally increasing every 4 weeks