Thank you everyone that gave me advice re. my iron level results. I have now been prescribed ferrous fumarate but reading the details it says don't take if you have b12 PA. The doctor knows I gave PA and said this is what i should take. She also said take with orange or grapefruit to help with digestion even though I told her my mouth and tongue ulcer badly even with one mouth full of orange juice. I can't even eat a small tomato. She just told me take it for 2 months and then go back to see a doctor. Does anyone know why you shouldn't take them if you have PA?