Subsequent studies have found that the mineral selenium is essential for GPX1 activity (Seale et al., 2020)
The reduction in AUC after oral administration can result from numerous mechanisms including: pH or bacterial-mediated metabolism of the drug within the GI tract, incomplete drug absorption from the GI tract, metabolism within the GI epithelium (which contains CYP3A4), excretion back into the GI tract by P-glycoprotein in the GI epithelium, hepatic metabolism, or biliary excretion into the GI tract
& Hsueh, A
Upconversion-nanoparticle-based smart drug-delivery platforms for multimodal imaging-guided cancer therapies, ACS appl
Other methods that report the value directly include the oxygen radical absorbance capacity (ORAC) and total radical trapping antioxidant parameter (TRAP) assays
Patients with hyperadrenergic POTS, however, typically tolerate and benefit from it immensely