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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

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They look at their MyChart or Patient Portal and see G62.9 and they Google it

Because it hasn't gone through rigorous clinical trials, we just don't know what a safe dose is, what the short-term side effects are, or what the long-term health consequences could be