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GHK-Cu stimulates fibroblast activity in these cells, supporting their ability to drive follicle development

*Correspondence: Zhigang Ren, [email protected] Yu, [email protected] These authors have contributed equally to this work This article was submitted to Signaling, a section of the journal Frontiers in Cell and Developmental Biology 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

Moreover, the interpretation of biomarker responses is complicated by the poor bioavailability and limited bloodbrain barrier penetration of many phytochemicals

Contaminated or underdosed peptides pose real risks, while mislabeled products may contain entirely different substances