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Even Skin Tone: Some studies suggest GHK-Cu can improve skin clarity and reduce hyperpigmentation, contributing to a more even skin tone

Funding We thank the Shandong Provincial Natural Science Foundation (ZR2021QB172), Key R&D Program of Shandong Province, China (2023CXPT012), Taishan Scholars Construction Engineering to GT (tstp20221145), National Natural Science Foundation of China (31771284), Taishan Scholars program to ZY (tsqn201812100), Shandong Provincial Natural Science Foundation (ZR2021MH292), Shandong Provincial Natural Science Foundation (ZR2021MH141), BZMC Scientific Research Foundation (BY2020KYQD08) for financial support of this study

35 , e2205409 (2023)

Besides the neutralization of free radicals produced in phase 1 liver metabolism of chemical toxins, GSH also participates in the protection from the resulting electrophilic substrates through the intervention of glutathione-S-transferases (GSTs)