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A 2018 clinical study: In the study of 71 women, a facial cream containing GHK-Cu was applied daily for 12 weeks
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Two-path impedance spectroscopy for measuring paracellular and transcellular epithelial resistance
Researchers maintaining ongoing protocols may prefer nasal spray during travel periods when carrying injection supplies is inconvenient, returning to injection when practical logistics allow
It contains a bacteriostatic agent, so it is not for use in newborns and should be used with caution in pregnancy or where large cumulative volumes could be given, following the relevant warnings
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