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Given 40-60% nasal bioavailability compared to 80-95% for injection, equivalent nasal doses would be approximately 400-1000mcg to achieve similar systemic levels
Unless you have specific reasons to try alternatives, GHK-Cu remains the standard
Brain Res 557 : 154161 Kirkby DL, Jones DN, Barnes JC, Higgins GA
However, it is worth noting that most clinical studies have analyzed the safety of glutathione up to 500 mg daily for up to two months
Characteristics of Glutathione Magarose Beads This protocol offers general guideline for protein purification and pull-down
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