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Your natural skin turnover rate, the specific glutathione concentration and formulation, consistency of use, and whether you're combining it with other brightening ingredients all play a role
Research has explored GHK Cu's potential role in tissue repair and skin health, which may relate to addressing visible signs of aging including those from sun exposure
Some contain degradation products
1 Richie JP Jr, Nichenametla S, Neidig W, Calcagnotto A, Haley JS, Schell TD, Muscat JE
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