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Still, several preservatives, such as nordihydroguaiaretic acid, have been withdrawn due to safety concerns
Functionalization of AgNPs with biocompatible polymers such as chitosan or polyethyleneimine further improves stability and bioavailability while reducing cytotoxicity to human cells (Liao et al., 2019)

This ingredient has some brightening potential but it's more of a prevention ingredient than spot-fader
[DOI] [PMC free article] [PubMed] [Google Scholar] 71.Lieber C.S
