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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

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

Benefits of Vitamin B-12 Injections Christine Collins, MD helps Los AngelesLong BeachAnaheim patients achieve optimal health by delivering superior care through innovative medicine

170 More research is needed to determine whether DHEA supplementation and/or achieving specific DHEA-S blood levels can benefit people with fibromyalgia

The bell-curve dose-response means starting low and titrating to the individual response is more important than with other peptides