5C: Cholecalciferol in Chronic Inflammatory Bowel Diseases

University Hospital, Basel, Switzerland (Other)
Overall Status
CT.gov ID

Study Details

Study Description

Brief Summary

In this research project, the investigators want to find out whether the additional intake of vitamin D further reduces the inflammatory events in the intestines of IBD patients. There are three groups of subjects: the 1st group takes a capsule of 24,000 IU per week, the 2nd group takes 24,000 IU per month, the 3rd group is the control group. The intake extends over 6 months during the autumn and winter period.

Condition or Disease Intervention/Treatment Phase
  • Drug: D3 VitaCaps®
Phase 3

Detailed Description

Inflammatory bowel diseases (IBD) are a chronic immunologically mediated inflammatory condition of the gastrointestinal tract comprising two clinical entities: ulcerative colitis and Crohn's disease. Genetic,environmental and microbial factors, and the immune responses play an important role in the disease development. The incidence and prevalence of IBD have increased in the past 50 years in the Western world and are increasing in developing countries. Faecal calprotectin is a reliable biomarker for functional quantitative measurement of intestinal inflammation in IBD. Faecal calprotectin test is recognized to be reliable in clinical practice for the assessment of endoscopic activity and remission. Vitamin D or cholecalciferol is a prohormone classified as a fat-soluble vitamin. The organism can produce the substance itself in the skin during summer time. The importance of vitamin D for the regulation of calcium metabolism, for bone formation, for the treatment of osteoporosis and for the prevention of falls and associated fractures is generally recognized. Vitamin D seems to play a role in the pathogenesis of many diseases,including IBD. Several observational studies showed an inverse correlation between 25(OH)D and disease activity. Vitamin D deficiency is common among patients with IBD. The relapse rate in patients with Crohn' disease and 25(OH)D <50 nmol/l is almost doubled. There is a significant inverse correlation between serum 25(OH)D levels and the specific inflammatory marker faecal calprotectin. The lowest serum 25(OH)D levels have been reported in patients with a more severe disease progression or previous ileum resection. Low 25(OH)D serum concentrations are associated with more frequent IBDassociated surgeries and hospitalisations. However, no intervention studies have been conducted to date that have investigated the influence of vitamin D on inflammation in adult IBD patients. An intervention study with subjects aged 5-18 years nevertheless showed a statistically significant inverse correlation between 25(OH)D serum concentration and the inflammation marker calprotectin.

The FOPH Expert Commission recommends a daily intake of 600 IU for adults aged 19-59 years, 800 IU for >60 years. The maximum tolerable intake for all age groups is 4'000 IU daily, with daily or cumulative intermittent, weekly or monthly, administration being considered. Adherence is, however, better with intermittent intake. In this study, the administration to patients with monthly supplementation represents one capsule per month, corresponding to 800 IU cholecalciferol daily. The administration to patients with weekly supplementation is one capsule per week, corresponding to 3,500 IU cholecalciferol daily. The cumulative administration of 24'000 IU per week does not exceed the upper limit of 4'000 IU per day or 28'000 IU per week. Insufficient adherence to IBD medication has been identified as responsible for therapy escalation with more expensive regimens, disease complication or hospitalization, that all drive substantial costs. In a systematic review including 93'998 patients with IBD, adherence rate to prescribed biologics ranged from 37% to 96%. Difficulties with medication adherence can be identified with indirect methods such as questionnaires. To monitor adherence, questionnaires and pill-count are the most frequently used methods. However, more robust methods are recommended such as electronic methods. One option is the use of a e-pill bottles with electronic caps. The opening of the e-pill-bottle that corresponds to the withdrawal of a medicine from the container is registered with a time stamp, a method currently in development in our research group.

Study Design

Study Type:
Anticipated Enrollment :
150 participants
Intervention Model:
Parallel Assignment
None (Open Label)
Primary Purpose:
Official Title:
Cholecalciferol Comedication in Patients With Chronic Inflammatory Bowel Diseases (Crohn's Disease or Ulcerative Colitis) - the 5C-study
Actual Study Start Date :
Sep 1, 2022
Anticipated Primary Completion Date :
Dec 31, 2023
Anticipated Study Completion Date :
Dec 31, 2023

Arms and Interventions

Arm Intervention/Treatment
Active Comparator: Weekly

weekly administration of one capsule, corresponding to approximately 3'500 IU cholecalciferol daily.

Drug: D3 VitaCaps®
Gelatine free soft capsules containing 24'000 IU cholecalciferol per capsule
Other Names:
  • Vitamin D
  • Active Comparator: Monthly

    monthly administration of one capsule, corresponding to approximately 800 IU cholecalciferol daily.

    Drug: D3 VitaCaps®
    Gelatine free soft capsules containing 24'000 IU cholecalciferol per capsule
    Other Names:
  • Vitamin D
  • No Intervention: Control

    no treatment

    Outcome Measures

    Primary Outcome Measures

    1. Faecal calprotectin value [6 months]

      Reduction of the faecal calprotectin value after 6 months.

    Secondary Outcome Measures

    1. CRP serum levels [6 months]

      Change in CRP serum levels after 6 months.

    2. Vitamin D levels [6 months]

      Increase in vitamin D levels after 6 months.

    3. Disease-specific activity score [6 months]

      Change in disease-specific activity score after 6 months.

    4. Adherence to the comedication [6 months]

      Adherence to the comedication with the vitamin D capsules

    Eligibility Criteria


    Ages Eligible for Study:
    18 Years and Older
    Sexes Eligible for Study:
    Accepts Healthy Volunteers:
    Inclusion Criteria:
    • Confirmed IBD diagnosis; Age ≥ 18 years
    Exclusion Criteria:
    • Hypercalcaemia defined as serum calcium value >2.70 mmol/l; Hyperparathyreoidism defined as serum iPTH value >65 ng/l; Hypoparathyreoidism defined as serum iPTH value <15 ng/l; Renal insufficiency defined as eGFR < 30 ml/min; Anamnesis of: Propensity to form calcium-containing kidney stones, Impaired renal calcium or phosphate excretion, Sarcoidosis; Pregnancy or lactation; Supplementation of vitamin D >200 IU/d (5μg/d) during study period; Administration of products that have a potential interaction with cholecalciferol, e.g. phenytoin, rifampicin, barbiturates, actinomycin, imidazole-antifungals

    Contacts and Locations


    Site City State Country Postal Code
    1 Clarunis University Center for Gastrointestinal and Liver Diseases Basel Switzerland 4002

    Sponsors and Collaborators

    • University Hospital, Basel, Switzerland


    • Principal Investigator: Petr Hrúz, Prof. Dr., Clarunis University Center for Gastrointestinal and Liver Diseases

    Study Documents (Full-Text)

    None provided.

    More Information


    None provided.
    Responsible Party:
    University Hospital, Basel, Switzerland
    ClinicalTrials.gov Identifier:
    Other Study ID Numbers:
    • EKNZ 2022-00899
    First Posted:
    Nov 22, 2022
    Last Update Posted:
    Dec 1, 2022
    Last Verified:
    Nov 1, 2022
    Studies a U.S. FDA-regulated Drug Product:
    Studies a U.S. FDA-regulated Device Product:
    Additional relevant MeSH terms:

    Study Results

    No Results Posted as of Dec 1, 2022