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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
Both beta defensin and NOD2 have been linked to Crohn's disease. If NOD2 is deficient or defective, it cannot combat invaders in the intestinal tract. Science has known for some time of the importance of vitamin D in the treatment of inflammatory bowel diseases like Crohn's and ulcerative colitis. I posted a study on this ten years ago. In my view it is reprehensible and irresponsible not to measure the levels of vitamin D in patients with this disease.