After years with ferritin scraping along bottom of the range it has at last risen, to nearly double and I thought others might like to know to see if the same works for you too.
There are two things I have done (after prescribed ferrous fumarate did not resolve the problem),
1) I regularly take Enzyme Digest after meals which was recommended by someone on here. A big thank you, and I hope you know who you are because I can't remember your name.
2) I've started supplementing with a different iron, this is called Iron Energy+ and is produced by Nutrition Geeks'. It contains Vitamins C, B12 and folic acid as well as iron.
Best of luck