what is l- glutathione L-Glutathione Glow On Brightening Toner L-Glutathione | Antioxidant Support |
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A.DowellJ
10.18632/oncotarget.15868 Oncotarget 77 LiangY.HanH.LiuL.DuanY.YangX.MaC.et al (2018)
ACS Inf Dis
Supplementation with GSH is generally ineffective at increasing cellular glutathione levels because most human cells cannot uptake extracellular GSH due to the lack of the membrane-bound ectoenzyme -glutamyltranspeptidase (-GT) or due to an unfavorable concentration gradient across the cell membrane 10,16
The bottleneck logic is worth restating because it explains when stacking helps at all: adding a second compound only matters if it clears a different rate-limiting step than the ones already covered
