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Second, pharmacokinetic measurements of brain GHK-Cu concentrations were not performed, limiting interpretation of route-dependent exposure differences [19,35]
Selank is a tuftsin-derived anxiolytic that modulates GABA signaling and dampens inflammation, used for stress resilience and focus

However, when tested under peptides drug screening for performance enhancement, it could be detected

2019;5(2):eaau8317
