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At nanomolar concentrations, GHK-Cu may act primarily as a signaling molecule, while higher concentrations in some models have shown different activity profiles

doi:10.1016/j.jns.2025.123627 NIH

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Do not use if the solution appears discolored, cloudy (when it should be clear), or contains particulate matter

Every day, the body is exposed to free radicals produced through normal metabolism, environmental pollution, ultraviolet (UV) radiation, and lifestyle factors