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Unlike vitamin C, which is water-soluble and clears within hours, or NAC, which supports endogenous synthesis rather than providing the active molecule, glutathione has a tissue half-life of 24 days and a measurable lag before oxidative markers rebound
Nature Reviews Neuroscience, 23:4 (4), 215230
Some studies suggest that oral glutathione may offer mild skin-lightening effects in certain groups, but the evidence is still mixed
One of the most remarkable benefits of GHK-Cu is its ability to accelerate wound healing
Parker MW et al
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