What doses do I need to be on for folic acid and ferrous fumarate and vitamin D please? I have been taking 1x 200mg ferrous fumarate once a day since 2013, 1x 5mg folic acid once a week since January and 1x 800iu vitamin D once a week since 2013. I have found it hard to increase ferrous fumarate to 3x a day as requested by GP because I get a heavy feeling in my stomach after taking it.
Serum ferritin 17 (15 - 150)
**Serum folate 2.5 (4.6 - 18.7)
**Serum vitamin B12 161 (180 - 900)
25 hydroxy vitamin D2 <6.0
25 hydroxy vitamin D3 33.1
**Total 25 OH vitamin D 33.1 (25 - 50 vitamin D deficiency. Supplementation is indicated)