Thank you for sharing that Kiny. I think they're going to find that these common deficiencies people with [wiki2="Crohns-Disease"]Crohn's Disease[/wiki2] experience play a bigger role than is realized.
Before anyone goes and starts taking huge doses of vitamin A, PLEASE NOTE that if you take a lot of vitamin A while deficient in vitamin D (which so many with IBD are) then that vitamin A can impair your vitamin D and cause other potential issues. Read about that here.