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Topical glutathione formulations exist but offer minimal penetration across the skin barrier, making systemic effects unlikely without intravenous delivery

[DOI] [PubMed] [Google Scholar] 23.Yang CG, Qiu WC, Wang ZG, Yu S, Yan J, Zheng O

[Google Scholar] 68.Bagchi D., Bagchi M., Stohs S.J., Das D.K., Ray S.D., Kuszynski C.A., Joshi S.S., Pruess H.G

In their studies, structural modifications were made to replace the piperazine sulfonamide part of sildenafil and vardenafil with groups that have a terminal zinc binding group ZBG (a hydroxamic acid or an ortho-aminoanilide moiety), which is essential for HDAC inhibition