To become "reduced" (active) again so it can go back to work, it needs an electron from NADPH
In this regard, hydrogen peroxide is converted into the hydroxyl radical, a harmful and highly reactive ROS, in the presence of transition metals such as iron (Figure 1)
This is the part that shows up in a lot of personal accounts
If you suspect that you are B12 deficient or think that you might benefit from a course of B12 injections, then dont hesitate
One case series , for example, described four patients who developed skin pain and tenderness after increasing their semaglutide dose for obesity treatment
Any injectable dosing in clinical or research settings should follow a licensed physician's guidance, and no consensus protocol exists