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The dose depends on whats in it

This nasal spray delivers GHK-Cu (glycyl-l-histidyl-l-lysine copper peptide) directly into the bloodstream through the nasal mucosa for rapid absorption

Yes, for the best and most sustainable results

10.1016/j.semcdb.2009.02.007 90 RijsewijkF.SchuermannM.WagenaarE.ParrenP.WeigelD.NusseR

A small clinical imaging study in Parkinsons disease patients showed that intranasal glutathione could raise brain glutathione levels within 2045 minutes, although the amount and duration varied widely among individuals