is glutathione serum effective for skin lightening: a regnant myth or evidence-based verity? while reducing oxidative stress that triggers discolouration How Glutathione Face Serum Works:
Description
(2004) 286:F106371.10.1152/ajprenal.00384.2003 100

It originally came from the gut

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MLC phosphorylation (pMLC) by either myosin light chain kinase (MLCK) or -associated coiled coil containing protein kinase (ROCK) stimulates tight junction regulation via contraction of the perijunctional actomyosin ring (PAMR) (45, 46)

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The p21-derived tumor suppressor peptide from the C-terminal region can inactivate PCNA, which is necessary for cell proliferation [53]