The purpose of this prospecitve randomized controlled trial is to compare effectiveness and patient/family adherence of weekly or daily Vitamin D-3 dosing regimens in children with Inflammatory Bowel Disease (IBD) who are 25-hydroxyvitamin D [25(OH)D] insufficient or deficient. The primary aim of this pilot study is to evaluate the effectiveness of once weekly verses daily D-3 dosing regimens based on the most current IBD supplementation guidelines in improving 25(OH)D levels. A seconary aim is to determine if there is difference in adherence between dosing regimns.

Inclusion Criteria:

• Subjects aged 5 to 17 years with a diagnosis of Inflammatory Bowel Disease, who have a 25(OH)D level below 30 ng/ml within 2 weeks of enrollment
• Subject/family must be able and willing to take oral medications, complete a 3 day dietary record, and return for 8 week concluding visit or clinicl visit

Exclusion Criteria:

• Subjects will not be eligible if they are intolerant of vitamin supplementation or any ingredients in the chosen supplment, are unable or unwilling to take oral supplements, or are on specific medical therapy for diminished bone mineral density
• Children with parathryoid disease, granulomatous disorders or William's syndrome will also be excluded from the study

Children with IBD, aged 5 to 17, who are vitamin D insufficient or deficient will be recruited at the time of a rountine clinic visit or lab draw that includes a 25(OH)D level as part of a clinical practice/standard of care.