glutathione peroxidase unit The (GPX) system and lipid peroxidation. GPX Figure 1 from Comparing glutathione

The first 2 weeks might bring dramatic relief followed by a period where progress seems to stall

In cases of nerve damage such as neuralgia, neuritis, Mortons neuroma, and peripheral neuropathy, injections of a concentrated B12 dose directly surrounding the affected nerve has been shown to promote nerve regeneration and diminish pathologic nerve pain

K.SaikantR.ManojG.KunwarA.SivaramG.et al (2010)

In these patients, an increased intestinal permeability was found, resulting in increased translocation of bacteria and endotoxins that supply the pro-inflammatory state

That distinction matters, because it means that producers might prepare such peptides at different concentrations, using different solvents, stabilizers and other ingredients

Sulphoraphane Improves Neuronal Mitochondrial Function in Brain Tissue in Acute Carbon Monoxide Poisoning Rats