I prefer not to store any B12 where it might just get contaminated
Check out this video to learn how they work and decide if they are right for you
Do not use 2 doses at once
Years of long-haul driving ruined my back, knees, and shoulders
For a broader look at how this antioxidant fits into skin-focused routines, What Is Glutathione Good For Skin
Jane Ellison, Conservative, gave a long and detailed answer, but the reality is that the data isnt clear, nor is it regularly updated and nor does it, for PAS at least, help identify accurate numbers of people with Pernicious Anaemia or a B12 deficiency