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By age 60, GHK-Cu levels in the body have fallen by roughly 60% a decline that correlates directly with the visible signs of skin aging: thinning, wrinkling, loss of firmness, slower healing
Researchers also distinguish reduced glutathione (GSH) from the disulfide GSSG, since it is the GSSG/2GSH ratio, not total glutathione, that Schafer and Buettner (Free Radical Biology and Medicine, 2001) established as the quantitative index of the cellular redox environment
Hsieh M.J
The permeability data are real and encouraging for oral absorption in principle
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