Yes, if you have a medical problem, supplements can be needed. But a decent government would include them with your prescription, of course.
– “instead there was a note in red saying ‘are you sure you meant to do that’”
The site software underwent a routine update a few days ago, probably since you last posted on the forums. The new version of the forum software seems to forget the username (it’s a bug), and you have to fill it in again or you get a message in red. It’s happened to me repeatedly, because it’s partly done from cookies and I have my browser set to clear them.