glutathione is vitamin Supplement 1,000mg Per Serving, 98% Purity | Plus C 500mg, Active Reduced Form (GSH) Glutathione And Vitamin C Therapy:
Description
Despite the lack of official approval, both compounds have accumulated substantial preclinical evidence and extensive anecdotal reports from users worldwide

Would surmise this has something to do with blood-flow/circulation then

doi: 10.1080/09513590.2019.1689553 139 AbediniMGhaediEHadiAMohammadiHAmaniR

This approach bypasses digestion so your body can utilize more of what it needs compared to oral supplements
