glutathione peroxidase location General reaction mechanisms for antioxidant Glutathione Peroxidase (GPx)

Lopez G, Latorre M, Reyes-Jara A, Cambiazo V, Gonzalez M: Transcriptomic response of Enterococcus faecalis to iron excess

WADA Prohibited List - Section S0 Unapproved Substances (BPC-157, TB-500 categorization)

These parallel mechanisms primarily include mitochondrial DHODH and the plasma membrane-localized Ferroptosis Suppressor Protein 1 (FSP1)CoQ10 system ( de novo pyrimidine nucleotide synthesis pathway, located in the inner mitochondrial membrane

If you've taken standard oral glutathione consistently without noticing any change, a liposomal version is a reasonable next option to try

The short answer is that it depends on which form of B12 you have