The short answer is that it depends on which form of B12 you have
Management and prevention of breast cancer after radiation to the chest for childhood, adolescent, and young adulthood malignancy
FIGURE 1 3.2 Oxidative stress markers, H 2 S level and mtNOS activity in heart mitochondria in glutathione-treated old rats It was shown that in old rat heart mitochondria, the values of oxidative stress indicators such as generation rates of O 2 and H 2 O 2 as well as the content of the primary products of lipid peroxidation products (DC and MDA) were higher in heart mitochondria of old rats comparing to adult ones (Table 2) indicating aggravation of free radical processes with age
Some integrative practitioners use IV glutathione which can increase glutathione levels for a short time, but since the IVs are not done daily, it is difficult to keep glutathione levels elevated
As a GLP-1/GIP/glucagon receptor agonist, it may theoretically delay gastric emptying, which is a class-related effect that could affect the absorption of orally administered medicines