{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=cholecalciferol+%28vitamin+D%29&page=16",
    "query": {
      "intervention": "cholecalciferol (vitamin D)",
      "page": 16
    },
    "page_size": 10
  },
  "pagination": {
    "page": 16,
    "page_size": 10,
    "total_count": 960,
    "total_pages": 96,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=cholecalciferol+%28vitamin+D%29&page=17&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=cholecalciferol+%28vitamin+D%29&page=15&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-15T12:54:30.819Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT00715429",
      "title": "Vitamin D for Painful Nocturnal Leg Cramps",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Leg Cramps, Nocturnal"
      ],
      "interventions": [
        {
          "name": "vitamin d",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 29,
      "start_date": "2007-08",
      "completion_date": "2011-08",
      "has_results": true,
      "last_update_posted_date": "2019-09-17",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "Madison, Wisconsin",
      "locations": [
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00715429"
    },
    {
      "nct_id": "NCT03739671",
      "title": "Vitamin D Supplementation and Effects on Mood in Emergency Medicine Residents",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Seasonal Mood Disorder"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "No Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Corewell Health South",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 27,
      "start_date": "2018-10-01",
      "completion_date": "2020-04-30",
      "has_results": false,
      "last_update_posted_date": "2024-11-29",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "Saint Joseph, Michigan",
      "locations": [
        {
          "city": "Saint Joseph",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03739671"
    },
    {
      "nct_id": "NCT02272387",
      "title": "Is Vitamin D Insufficiency and Deficiency Associated With Antepartum and Postpartum Depression?",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Depression",
        "Postpartum Depression"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 (Cholecalciferol)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "St. Luke's-Roosevelt Hospital Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 151,
      "start_date": "2014-10",
      "completion_date": "2016-04-14",
      "has_results": false,
      "last_update_posted_date": "2017-08-24",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02272387"
    },
    {
      "nct_id": "NCT01325311",
      "title": "Cholecalciferol and Genistein Before Surgery in Treating Patients With Early Stage Prostate Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Prostate Adenocarcinoma",
        "Stage I Prostate Cancer",
        "Stage IIA Prostate Cancer",
        "Stage IIB Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DRUG"
        },
        {
          "name": "Genistein",
          "type": "DRUG"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Pharmacological Study",
          "type": "OTHER"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 15,
      "start_date": "2011-12",
      "completion_date": "2014-07",
      "has_results": true,
      "last_update_posted_date": "2016-08-03",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 11,
      "location_summary": "Birmingham, Alabama • Baltimore, Maryland • Burlington, Massachusetts + 6 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Burlington",
          "state": "Massachusetts"
        },
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01325311"
    },
    {
      "nct_id": "NCT00920621",
      "title": "Randomized Trial: Maternal Vitamin D Supplementation to Prevent Childhood Asthma (VDAART)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Asthma"
      ],
      "interventions": [
        {
          "name": "Vitamin D 3 cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "39 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 39 Years · Female only"
      },
      "enrollment_count": 876,
      "start_date": "2009-09",
      "completion_date": "2023-08",
      "has_results": true,
      "last_update_posted_date": "2026-05-12",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 3,
      "location_summary": "San Diego, California • Boston, Massachusetts • St Louis, Missouri",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00920621"
    },
    {
      "nct_id": "NCT01697228",
      "title": "The Effects of Vitamin D on Glycemic Control and Proinflammatory Markers in Adolescents With T1DM",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Type 1 Diabetes",
        "Vitamin D Deficiency/Insufficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Children's Hospital Los Angeles",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "13 Years",
        "maximum_age": "21 Years",
        "sex": "ALL",
        "summary": "13 Years to 21 Years"
      },
      "enrollment_count": 26,
      "start_date": "2012-10",
      "completion_date": "2014-06",
      "has_results": false,
      "last_update_posted_date": "2017-05-08",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01697228"
    },
    {
      "nct_id": "NCT02387931",
      "title": "Supplementation in Adolescent Girls With Endometriosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Endometriosis"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Fish Oil",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Boston Children's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "25 Years",
        "sex": "FEMALE",
        "summary": "12 Years to 25 Years · Female only"
      },
      "enrollment_count": 69,
      "start_date": "2014-09",
      "completion_date": "2016-07",
      "has_results": false,
      "last_update_posted_date": "2016-12-01",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02387931"
    },
    {
      "nct_id": "NCT04386577",
      "title": "Effects of Vitamin D and Omega-3 Supplementation on Telomeres in VITAL",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Aging"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 (cholecalciferol)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "fish oil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Augusta University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 1054,
      "start_date": "2016-08-19",
      "completion_date": "2021-04-30",
      "has_results": false,
      "last_update_posted_date": "2020-05-13",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "Augusta, Georgia",
      "locations": [
        {
          "city": "Augusta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04386577"
    },
    {
      "nct_id": "NCT01371877",
      "title": "The Role of Vitamin D in Chronic Urticaria and Angioedema Treatment",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Urticaria",
        "Angioedema",
        "Hives",
        "Swelling"
      ],
      "interventions": [
        {
          "name": "High Dose Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Low Dose Vitamin D3",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Nebraska",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "19 Years and older"
      },
      "enrollment_count": 42,
      "start_date": "2011-11-01",
      "completion_date": "2013-09-01",
      "has_results": true,
      "last_update_posted_date": "2023-09-21",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01371877"
    },
    {
      "nct_id": "NCT00656019",
      "title": "Development of Vitamin D as a Therapy for Breast Cancer - Phase 2",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Stanford University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 63,
      "start_date": "2008-04",
      "completion_date": "2011-12",
      "has_results": true,
      "last_update_posted_date": "2017-12-02",
      "last_synced_at": "2026-10-15T12:54:30.819Z",
      "location_count": 1,
      "location_summary": "Stanford, California",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00656019"
    }
  ]
}