*Correspondence: Tong Liu, [email protected] Zhang, [email protected] These authors have contributed equally to this work Disclaimer All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers
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On skin, many people alternate copper peptides with retinol rather than layering both at once, and keep strong vitamin C or exfoliating acids to separate times
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Kastner, B., Will, C.L., Stark, H