8 sources
Is oral glutathione absorbed?
Small studies split on whether swallowed glutathione reaches the blood. The results appear to track how long people took it and what each study compared against.
glutathionebioavailability
The publication
Claims, attributed. Disagreements, kept visible.
Every piece states who made a claim, on which endpoint and population, what evidence was cited, and where sources contradict each other. The reading is yours to do.