Crohns Disease is an inflammatory disease of primarily the small intestine and colon.

Recent years scientist has hypothesized low blood vitamin-D levels playing a role in the development of autoimmune disease, including Crohns disease. The purpose of this study is to examine whether vitamin-D is effective in keeping remission in inactive Crohns Disease (double blind placebo controlled trial). The patients who have active disease in the placebo group (reach primary endpoint), will in an open setting receive a higher single dose vitamin-D and the effect will be measured within weeks.

Inclusion Criteria:

• Crohn´s disease
• Inactive Crohns disease for at least 4 weeks
• CDAI<150
• C-reactive protein within normal range
• serum-albumine within normal range

Exclusion Criteria:

• Hypercalcemia
• Short bowel syndrome
• Pregnancy