{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=21",
    "query": {
      "intervention": "Vitamin D (cholecalciferol)",
      "page": 21
    },
    "page_size": 10
  },
  "pagination": {
    "page": 21,
    "page_size": 10,
    "total_count": 960,
    "total_pages": 96,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=22&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=20&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-15T12:17:53.803Z",
  "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": "NCT00912782",
      "title": "Vitamin D and Arteriovenous Fistulae",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "End-stage Renal Disease"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "18 Years to 85 Years"
      },
      "enrollment_count": 52,
      "start_date": "2009-01",
      "completion_date": "2011-06",
      "has_results": true,
      "last_update_posted_date": "2014-07-02",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00912782"
    },
    {
      "nct_id": "NCT00145327",
      "title": "Double-blind Extension of HORIZON Pivotal Fracture Trial (Zoledronic Acid in the Treatment of Postmenopausal Osteoporosis)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Osteoporosis"
      ],
      "interventions": [
        {
          "name": "Zoledronic Acid",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "68 Years",
        "maximum_age": "90 Years",
        "sex": "FEMALE",
        "summary": "68 Years to 90 Years · Female only"
      },
      "enrollment_count": 2456,
      "start_date": "2005-05",
      "completion_date": "2009-11",
      "has_results": true,
      "last_update_posted_date": "2011-06-28",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 30,
      "location_summary": "Tucson, Arizona • Little Rock, Arkansas • Beverly Hills, California + 26 more",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Beverly Hills",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Walnut Creek",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00145327"
    },
    {
      "nct_id": "NCT00668941",
      "title": "Cyclic Versus Daily Teriparatide on Bone Mass",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Osteoporosis"
      ],
      "interventions": [
        {
          "name": "Teriparatide",
          "type": "DRUG"
        },
        {
          "name": "Alendronate",
          "type": "DRUG"
        },
        {
          "name": "Calcium",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Helen Hayes Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": "85 Years",
        "sex": "FEMALE",
        "summary": "45 Years to 85 Years · Female only"
      },
      "enrollment_count": 140,
      "start_date": "2005-09",
      "completion_date": "2017-11",
      "has_results": false,
      "last_update_posted_date": "2017-08-10",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 1,
      "location_summary": "West Haverstraw, New York",
      "locations": [
        {
          "city": "West Haverstraw",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00668941"
    },
    {
      "nct_id": "NCT01450462",
      "title": "Vitamin D and Sexual Health",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Bacterial Vaginosis"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 (cholecalciferol)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Ohio State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 50 Years · Female only"
      },
      "enrollment_count": 118,
      "start_date": "2011-09",
      "completion_date": "2013-01",
      "has_results": false,
      "last_update_posted_date": "2013-12-04",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 1,
      "location_summary": "Columbus, Ohio",
      "locations": [
        {
          "city": "Columbus",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01450462"
    },
    {
      "nct_id": "NCT02064946",
      "title": "High-dose Vitamin D Supplementation for ADT-induced Side Effects",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Prostatic Neoplasms",
        "Bone Mineral Density Quantitative Trait Locus 3"
      ],
      "interventions": [
        {
          "name": "vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Rochester",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": "99 Years",
        "sex": "MALE",
        "summary": "60 Years to 99 Years · Male only"
      },
      "enrollment_count": 108,
      "start_date": "2014-03",
      "completion_date": "2016-11",
      "has_results": false,
      "last_update_posted_date": "2019-04-08",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 1,
      "location_summary": "Rochester, New York",
      "locations": [
        {
          "city": "Rochester",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02064946"
    },
    {
      "nct_id": "NCT01170273",
      "title": "Vitamin D in Vulnerable Adults (VIVA-VA)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Frail Elderly",
        "Vitamin d Deficiency"
      ],
      "interventions": [
        {
          "name": "vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": "95 Years",
        "sex": "MALE",
        "summary": "65 Years to 95 Years · Male only"
      },
      "enrollment_count": 130,
      "start_date": "2010-08",
      "completion_date": "2014-12",
      "has_results": true,
      "last_update_posted_date": "2016-12-21",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 1,
      "location_summary": "Miami, Florida",
      "locations": [
        {
          "city": "Miami",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01170273"
    },
    {
      "nct_id": "NCT00206388",
      "title": "Zoledronic Acid (ZOMETA) With Cyclophosphamide With Neuroblastoma and Cortical Bone Involvement",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "NEUROBLASTOMA"
      ],
      "interventions": [
        {
          "name": "Zolendric acid",
          "type": "DRUG"
        },
        {
          "name": "Cyclophosphamide",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Baylor College of Medicine",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "30 Years",
        "sex": "ALL",
        "summary": "Up to 30 Years"
      },
      "enrollment_count": 21,
      "start_date": "2005-04",
      "completion_date": "2013-05",
      "has_results": false,
      "last_update_posted_date": "2013-08-02",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 8,
      "location_summary": "Los Angeles, California • San Francisco, California • Stanford, California + 5 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Stanford",
          "state": "California"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00206388"
    },
    {
      "nct_id": "NCT01588522",
      "title": "Compound 31543 (Calcitriol, USP) in Patients Receiving Taxane-based Chemotherapy Regimens for the Treatment of Chemotherapy-Induced Alopecia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Chemotherapy-Induced Alopecia"
      ],
      "interventions": [
        {
          "name": "Compound 31543 Calcitriol 5 μg/mL",
          "type": "DRUG"
        },
        {
          "name": "Compound 31543 Calcitriol 10 μg/mL",
          "type": "DRUG"
        },
        {
          "name": "Compound 31543 Calcitriol 20 μg/mL",
          "type": "DRUG"
        },
        {
          "name": "Compound 31543 Calcitriol 40 μg/mL",
          "type": "DRUG"
        },
        {
          "name": "Compound 31543 Calcitriol 60 ug/mL",
          "type": "DRUG"
        },
        {
          "name": "Compound 31543 Calcitriol 80 μg/mL",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "BPGbio",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 28,
      "start_date": "2012-09-17",
      "completion_date": "2017-02-16",
      "has_results": true,
      "last_update_posted_date": "2026-08-17",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 2,
      "location_summary": "Los Angeles, California • New York, New York",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01588522"
    },
    {
      "nct_id": "NCT01354262",
      "title": "Effect of Vitamin D Supplementation on Hemoglobin A1c",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Diabetes Mellitus",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Ascension Health",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "34 Years",
        "maximum_age": "69 Years",
        "sex": "ALL",
        "summary": "34 Years to 69 Years"
      },
      "enrollment_count": 150,
      "start_date": "2011-03",
      "completion_date": "2012-06",
      "has_results": false,
      "last_update_posted_date": "2015-04-23",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 1,
      "location_summary": "Flint, Michigan",
      "locations": [
        {
          "city": "Flint",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01354262"
    },
    {
      "nct_id": "NCT07631312",
      "title": "Collegiate Athlete Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Iron Deficiency",
        "Iron Deficiency Anemia (IDA)",
        "Vitamin D Deficiency",
        "Vitamin D Insufficiency",
        "Low Energy Availability",
        "Bone Density"
      ],
      "interventions": [
        {
          "name": "Iron and Vitamin D Deficiencies Correction",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Morehouse School of Medicine",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 36,
      "start_date": "2024-08-19",
      "completion_date": "2026-05-01",
      "has_results": false,
      "last_update_posted_date": "2026-06-08",
      "last_synced_at": "2026-10-15T12:17:53.803Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07631312"
    }
  ]
}