Oral Vitamin D3 Effect on Inflammatory Biomarkers in Ulcerative Colitis Patients

This study is testing whether oral vitamin D3 supplements can reduce inflammation markers in people with moderate ulcerative colitis (a chronic bowel disease causing inflammation of the large intestine) who are severely deficient in vitamin D. **You may be eligible if...** - You are between 20 and 40 years old - You have been previously diagnosed with ulcerative colitis using clinical and endoscopic criteria - Your colitis is currently classified as moderate severity - You have not changed your ulcerative colitis medications in the past month - Your vitamin D level is severely low (below 10 ng/mL) **You may NOT be eligible if...** - You have been taking vitamin D supplements in the 3 months before the study - You have Crohn's disease or other autoimmune conditions - Your colitis is mild or severe (only moderate qualifies) - You have kidney or liver disease - You are pregnant or breastfeeding - Your medication type or dose changes during the study Talk to your doctor to see if this trial is right for you.