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However, glutathione operates through a completely different mechanism it's a recycler and detox cofactor rather than a direct free radical quencher

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The Urano group reported the QuicGSH probe, elegantly taking advantage of the fast reversible reactions between GSH and a cationic silicon-rhodamine scaffold 38

So far as I can tell, they were developed by a Chinese company called AMASS, and then HobbyKing either purchased or licensed the patent from them

While not one of the more severe GHK-Cu contraindications, its a safety factor to consider, and any use should start at a very low dose with careful monitoring for dizziness or lightheadedness