The Vitamin D in Pediatric Crohn's Disease

Eligibility Criteria: \- Diagnosis of CD by the usual clinical, endoscopic and histological criteria and classified according to the Paris classification Inclusion Criteria: * Age at randomization between 9 and 18 years inclusively * Interval between diagnosis and randomization between 2 weeks and 6 months after the diagnosis * Pediatric Crohn's Disease Activity Index (PCDAI) ≤ 30 at inclusion * Concurrent treatment with corticosteroids and/or enteral nutrition and/or thiopurines (azathioprine, 6-mercaptopurine) and/or methotrexate and/or 5-aminosalicylic acid (5-ASA) and/or TNF-α inhibitors (Infliximab, Adalimumab). Exclusion Criteria: * Patient diagnosed with severe complex perianal fistulizing CD (defined as the presence at diagnosis of a high intersphincteric, transsphincteric, extrasphincteric, or suprasphincteric complex perianal fistula) * Known chronic liver cholestasis (defined by an elevation of conjugated bilirubin and/or gamma glutamyl transferase \> 3 upper limit normal) * Known renal dysfunction requiring chronic dialysis or creatinine ≥ 100 micromol/L. * Known congenital bone disease * Known cystic fibrosis or other exocrine pancreatic insufficiency. * Currently treated with anticonvulsants metabolized through cytochrome P-450 * Unable to take oral capsule form.