I've managed to persuade the duty GP at my surgery that the results of my recent French blood tests are something to be at least mildly concerned about: ferritin 4 and vitamin d 17. He really didn't seem that worried by either.
Anyhow, he's prescribed ferrous fumarate 305 mg per day for 30 days and vitamin d3 1000 u per day for 3 months. Is this likely to be adequate? I'll be seeing my own, rather more patient-driven GP next Monday and I'll raise the question of the low normal b12 level with her; more likely to get a decent hearing.