mthboards, I'm with you on the need for vitamin D supplements and my daughter takes 5000IU D3 daily.
BUT you have got to stop saying that taking vitamin D, or boosting the immune system, interferes with the action of meds that suppress the immune system. That just isn't true.
This is because taking vitamin D has a complex effect on the entire body, raising the aborption of calcium, calming down the parathyroid glands, etc., none of which interferes with the action of meds traditionally prescribed for Crohn's.
DarrylP, for instance, points out a very targeted action of vitamin D on a particular gene. So to say it "boosts the immune system" is an oversimplification. To go further and say it doesn't make sense to take D while on meds can be a harmful disservice to people who should be taking both meds AND vitamin D.
If you happen to have an article corroborating your claim, please share.