can glutathione be absorbed orally oral absorption rate Formulation-dependent differences in systemic availability: Comparative pharmacokinetics of dissolving film and tablet formulations in healthy adults Augmented Glutathione Absorption from Oral – oral oral glutathione absorption bioavailability randomized

And one of the things thats really interesting is the drop off of kids identifying as trans

Incubations of either lysate or supernatant containing L68Q-hCC with reducing agents glutathione or N-acetylcysteine (NAC) break oligomers into monomers

The protocol is technically still running, the response is not

J Colloid Interface Sci 629:822831 Long HW, Zeng W, Wang H, Qian MM, Liang YH, Wang ZC (2018) Self-assembled biomolecular 1D nanostructures for aqueous sodium-ion battery

However, published human pharmacokinetic data comparing oral to injectable absorption at equivalent doses has not been established in peer-reviewed literature