Vitamin D dosage

Hello all - lots of variation re: Vitamin D dosage for UC'ers. Recent study has come out linking low levels of D to increased flares. My doc is ok with my supplement regime but doesn't really believe in supplements as that important (am clinically D and B deficient).

I am at the tail end of a flare and increased from 2000 iu to 4000 vit D. Based on research, this isn't really "that high".

Also, toying around with lowest dose iron every other day - lots of bleeding with this flare - plus iron binds you up a bit!

Any thoughts?


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47 yo female
Dx 12 years ago
Lialda 4/day, rowasa during flare, tapered from 40 mg pred now at 10, finally seeing light at end of the tunnel

40000 vit D, sublingual B, Ultimate Flora 50 billion probiotic, Evening primrose oil (check it out older ladies!!! really helps with monthly issues)

I take at least 12000iu, plus try to get sun as warmer months approach.

I think there is no yardstick as such. One needs to toy around with the dose and check what daily dose maintains levels higher than 50ug/ml. I live in NY so during winter, I maintain 5000Iu a day but in summer, I make it 2000IU a day.

There seems to be a lot of factors at play. Even with that dosage, I have noticed variation. 2 years ago, vit D levels went upto 63ug/ml but last year it hovered around 40ug/ml.

Make sure to supplement Vit K2 with it, else you are mobilizing a lot of calcium in the body but there is no way to direct that calcium, hence may end up in the arteries in absence of Vit K2.