Vitamin D has been on my mind recently after meeting several IBD patients who were deficient or haven’t had recent levels checked.
During the winter, many of us don’t get enough sunlight—the best source of vitamin D. This is especially concerning for people with IBD, who are already at higher risk of deficiency.
There are hundreds of studies on vitamin D and IBD. While there are limitations to these studies, and more research is always helpful, we know vitamin D can impact gut health and play a role in disease management.
This image shows why getting enough vitamin D is important for people with IBD:
While deficiency is common, there’s no universal standard for what counts as “low.”
Most guidelines suggest below 20–30 ng/mL is low, but these numbers focus on bone health, not IBD.
I prefer aiming for levels above 40 ng/mL.
Bottom line: Most people with IBD will need to supplement with vitamin D.
Here’s how I decide what to recommend:
- Less than 20 ng/mL: Likely needs a weekly prescription of 50,000IU. Discuss with MD.
- 20-40 ng/mL: Prescription (as above) or 5,000IU/day oral vitamin D3.
- Above 40 ng/mL: 2,000 IU/day oral vitamin D3 for maintenance
Recheck levels after 3–6 months and adjust.
A simple vitamin D supplement can make a big difference.
