{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=1000+IU%2Fd+cholecalciferol&page=3",
    "query": {
      "intervention": "1000 IU/d cholecalciferol",
      "page": 3
    },
    "page_size": 10
  },
  "pagination": {
    "page": 3,
    "page_size": 10,
    "total_count": 66,
    "total_pages": 7,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=1000+IU%2Fd+cholecalciferol&page=4&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=1000+IU%2Fd+cholecalciferol&page=2&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-07T18:48:14.210Z",
  "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": "NCT01050387",
      "title": "Effects of Vitamin D Dose and Genotype of the Binding Protein in Infants and Children",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Yale University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "6 Years",
        "sex": "ALL",
        "summary": "6 Months to 6 Years"
      },
      "enrollment_count": 193,
      "start_date": "2010-01",
      "completion_date": "2013-02",
      "has_results": false,
      "last_update_posted_date": "2014-08-05",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01050387"
    },
    {
      "nct_id": "NCT02166333",
      "title": "Study To Understand Fall Reduction and Vitamin D in You",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Falls"
      ],
      "interventions": [
        {
          "name": "200 IU/d cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "1000 IU/d cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "2000 IU/d cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "4000 IU/d cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Johns Hopkins University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "70 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "70 Years and older"
      },
      "enrollment_count": 688,
      "start_date": "2015-06-30",
      "completion_date": "2019-06-07",
      "has_results": true,
      "last_update_posted_date": "2021-05-14",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 2,
      "location_summary": "Baltimore, Maryland • Hagerstown, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Hagerstown",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02166333"
    },
    {
      "nct_id": "NCT01797302",
      "title": "Vitamin D and Vascular Health in Children",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Obesity",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Pittsburgh",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "10 Years",
        "maximum_age": "18 Years",
        "sex": "ALL",
        "summary": "10 Years to 18 Years"
      },
      "enrollment_count": 225,
      "start_date": "2013-08",
      "completion_date": "2018-08-13",
      "has_results": true,
      "last_update_posted_date": "2020-06-24",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01797302"
    },
    {
      "nct_id": "NCT01967628",
      "title": "Human Lung Responses to Respiratory Pathogens",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Respiratory Infection"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 (cholecalciferol)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo Sugar Pill",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Iowa",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 98,
      "start_date": "2007-06",
      "completion_date": "2010-10",
      "has_results": true,
      "last_update_posted_date": "2018-03-29",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 1,
      "location_summary": "Iowa City, Iowa",
      "locations": [
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01967628"
    },
    {
      "nct_id": "NCT00022087",
      "title": "Zoledronate, Calcium, and Vitamin D in Preventing Bone Loss in Women Receiving Adjuvant Chemotherapy for Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Cancer",
        "Osteoporosis"
      ],
      "interventions": [
        {
          "name": "calcium salts",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "zoledronic acid",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Alliance for Clinical Trials in Oncology",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "40 Years and older · Female only"
      },
      "enrollment_count": 439,
      "start_date": "2001-12",
      "completion_date": "2009-02",
      "has_results": false,
      "last_update_posted_date": "2016-07-19",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 107,
      "location_summary": "Arroyo Grande, California • La Jolla, California • Mountain View, California + 80 more",
      "locations": [
        {
          "city": "Arroyo Grande",
          "state": "California"
        },
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Mountain View",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00022087"
    },
    {
      "nct_id": "NCT01295034",
      "title": "Vitamin D Supplements for HIV-positive Patients on cART",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "HIV-associated Co-morbidities"
      ],
      "interventions": [
        {
          "name": "conventional vitamin D treatment",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "tiered/titrated vitamin D dosing",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Andrea Branch",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 62,
      "start_date": "2011-03",
      "completion_date": "2015-06",
      "has_results": true,
      "last_update_posted_date": "2017-04-17",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01295034"
    },
    {
      "nct_id": "NCT00634686",
      "title": "Effects of Omega-3 Fatty Acids on Bone and Frailty",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Osteoporosis",
        "Frailty"
      ],
      "interventions": [
        {
          "name": "DHA/EPA",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo capsule",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Calcium with vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Donaghue Medical Research Foundation",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "65 Years and older · Female only"
      },
      "enrollment_count": 150,
      "start_date": "2007-01",
      "completion_date": "2009-06",
      "has_results": false,
      "last_update_posted_date": "2009-02-02",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 1,
      "location_summary": "Farmington, Connecticut",
      "locations": [
        {
          "city": "Farmington",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00634686"
    },
    {
      "nct_id": "NCT00321932",
      "title": "Zoledronic Acid in Preventing Osteoporosis in Patients Undergoing Donor Stem Cell Transplant",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Leukemia",
        "Lymphoma",
        "Myelodysplastic Syndromes",
        "Osteoporosis",
        "Ovarian Cancer"
      ],
      "interventions": [
        {
          "name": "calcium",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "zoledronic acid",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "University of Minnesota",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 61,
      "start_date": "2005-07",
      "completion_date": "2012-03",
      "has_results": true,
      "last_update_posted_date": "2017-03-09",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 2,
      "location_summary": "Minneapolis, Minnesota • Madison, Wisconsin",
      "locations": [
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        },
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00321932"
    },
    {
      "nct_id": "NCT02636348",
      "title": "Evaluation of Calcium and Vitamin D Supplementation During Marine Corps Training",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Nutrition Status",
        "Bone Health"
      ],
      "interventions": [
        {
          "name": "Calcium/Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "United States Army Research Institute of Environmental Medicine",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "17 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "17 Years and older"
      },
      "enrollment_count": 380,
      "start_date": "2015-07",
      "completion_date": "2016-10",
      "has_results": false,
      "last_update_posted_date": "2016-10-28",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 1,
      "location_summary": "Parris Island, South Carolina",
      "locations": [
        {
          "city": "Parris Island",
          "state": "South Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02636348"
    },
    {
      "nct_id": "NCT01537809",
      "title": "Impact of Vitamin D Supplementation on Cardiometabolic Risk Factors [The Daily D Health Study]",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Tufts University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "9 Years",
        "maximum_age": "14 Years",
        "sex": "ALL",
        "summary": "9 Years to 14 Years"
      },
      "enrollment_count": 691,
      "start_date": "2011-06",
      "completion_date": "2013-12",
      "has_results": false,
      "last_update_posted_date": "2013-12-13",
      "last_synced_at": "2026-10-07T18:48:14.210Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01537809"
    }
  ]
}