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GHK-Cu is a tripeptide (glycine-histidine-lysine) complexed with a single copper(II) ion
To critically appraise mechanisms and levels of evidence ( in vitro, in vivo , clinical) for vitamin E and C, glutathione and its precursors, polyphenols (quercetin, resveratrol, curcumin), Crocus sativus carotenoids (crocin/safranal), and indirect modulators (e.g., omega-3, folinic acid), emphasizing study quality, translational relevance, and limitations
500 mg/day used most commonly across skin and general antioxidant trials
DOP31-K01), and serotonin (5-HT, cat no
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