While supplementation with exogenous GSH has shown therapeutic potential on its own, recent findings indicate advantages to combined treatment with other immunomodulatory or anti-infective agents ( As a combined medicinal treatment for viral infections such as COVID-19 or influenza, administration of GSH or NAC in conjunction with established anti-viral treatment has been found to improve lymphocyte response, reduce pro-inflammatory cytokines and reduce cellular oxidative injury ( As a pharmacologic therapeutic, optimizing the efficacy of GSH and minimizing its unintended effects means it is crucial to determine the correct timing, dose, and disease context ( In addition to being a therapeutic target, oxidative stress has been shown to decrease the GSH:GSSG ratio which has proven useful as a clinically accessible, pharmacodynamic biomarker of immune redox tone for conditions such as malignancy (Zitka et al., 2012)

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doi: 10.4196/kjpp.2016.20.1.15 45 HanafyA.AldawsariH
Shake gently before use
Badenhorst et al., Journal of Cosmetic Dermatology, 2016 GHK-Cu Before and After: The Week-by-Week Timeline The most important thing to understand about GHK-Cu results is that they are cumulative and progressive
For topical skincare, timing is a minor factor