glutathione disulfide exchange Mechanistic insights on the reduction of by protein disulfide isomerase Kinetics and Mechanisms of Thiol–Disulfide
Description
Over the past decade, mass spectrometry (MS) has emerged as the premier tool for analyzing proteins and their PTMs (Aebersold and Mann 2016) due to its high sensitivity, reproducibility, considerable throughput, and the capacity to identify high-confidence PTM sites

T.MarcianiP.RolfsA.BrennanK.WehrK.BarrowD.et al (2000)

Consumer reports help the FDA take action against non-compliant brands and retailers

Hi Thess, I have been self injecting B12 up to twice a week in Australia for a few years without any problems
