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de Oliveira et al., 2019

Clinical pharmacology and therapeutic use of pyridostigmine

This flexibility allows prescribers to tailor treatment to individual patient profiles rather than fitting every patient into the same two or three commercial products

Active at nanomolar concentrations: Unlike many peptides that require high systemic concentrations, GHK-Cu has been shown to exert meaningful biological effects at nanomolar (10 M) concentrations making it effective even at low doses

What happened next is the crux of the modern confusion: the compound did not disappear, it migrated into the research-chemical and performance-enhancement markets, where it is discussed as though the early surrogate-marker data were equivalent to proof of a clinical benefit