I went in to my GP for a checkup, and while I was there, she suggested I get a blood work-up since it had been a year (I'm on a med for my asthma that can jack with my liver and what not). So I got the results back yesterday, and all was normal (yay!) except for my vitamin D, which was pretty low. Now, mind you, I had suspicions of that over the past month, as I've explored a number of possible reasons for my IBS. I recently read something about lack of vitamin D contributing to it, so for a week or so prior to my blood test, I had been taking D. No telling what it would have been if I hadn't been taking it. Normal range is 30-100 u/L and mine came in at 20. I never had IBS before I moved up North where it's dark and gray for 6 months of the year....and a job that keeps me indoors 99% of the day. I'm not saying that caused it...but perhaps led to some of the lack of the vitamin.Has anyone else discovered this, and if so, did getting your vitamin D levels back to normal help you out?