250 mcg is being added to every 100g of flour. 188 mcg remains after baking. Gov limit for over 50s is 200 mcg. That means your daily flour limit will be 106g of flour. You would need to eat one sandwich 80-90g. A regular sandwich made of 80–90 g of bread (50-60g of flour) could use up roughly half that allowance (94-113 mcg). If you eat that sandwich, here's what else you would need to watch: Breakfast cereals fortified with folic acid Toast, crumpets, muffins and croissants Biscuits, cakes and pastries Pizza, pasta and noodles made with fortified flour Pies, pasties and sausage rolls Yorkshire puddings, stuffing and gravy containing fortified flour Any vitamin supplements containing folic acid And that's before you've counted any other sources of folic acid. threadreaderapp.com/thread/2…

When pregnant mice with B12 deficiency were given folic acid at doses that would induce unmetabolised folic acid in the blood, there were effects on the offspring, grandchildren and great grandchildren.