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Plasma Concentration: From ~200 ng/mL to ~80 ng/mL Research measuring GHK-Cu across different age groups has found plasma concentrations of roughly 200 ng/mL around age 20, falling to approximately 80 ng/mL by age 60 a decline of more than 50% over four decades
10.1038/cddis.2015.150 74 LuoW.HuangB.LiZ.LiH.SunL.ZhangQ.et al
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But if chronic stress is present, cortisol can remain elevated for too long, affecting many aspects of health, including adrenal function and HPA axis dysregulation 10
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