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Brardan, D., Franger, S., Meena, A

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

267 While there is a need in clinical research to enroll a more homogeneous patient population, this approach raises concerns about the clinical relevance of such studies for the truly heterogeneous IC/BPS population