{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3+%28cholecalciferol%29+placebo&page=6",
    "query": {
      "intervention": "Vitamin D3 (cholecalciferol) placebo",
      "page": 6
    },
    "page_size": 10
  },
  "pagination": {
    "page": 6,
    "page_size": 10,
    "total_count": 407,
    "total_pages": 41,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3+%28cholecalciferol%29+placebo&page=7&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3+%28cholecalciferol%29+placebo&page=5&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-13T21:19:30.712Z",
  "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": "NCT01675557",
      "title": "Pharmacokinetic Comparison of Vitamin's D2 and D3 in Stage 5 Chronic Kidney Disease Patients on Chronic Hemodialysis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D2",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Creighton University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "20 Years to 65 Years"
      },
      "enrollment_count": 30,
      "start_date": "2012-09",
      "completion_date": "2013-05",
      "has_results": false,
      "last_update_posted_date": "2015-02-26",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01675557"
    },
    {
      "nct_id": "NCT07271316",
      "title": "Alii Supplement Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Nutrient Deficiency",
        "Happiness",
        "Digestive Health",
        "Vulnerability to Disease",
        "Mood Swings",
        "Energy"
      ],
      "interventions": [
        {
          "name": "Alii Supplement",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Texas Christian University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "25 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 25 Years · Female only"
      },
      "enrollment_count": 16,
      "start_date": "2026-01-12",
      "completion_date": "2026-04-20",
      "has_results": true,
      "last_update_posted_date": "2026-07-13",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 1,
      "location_summary": "Fort Worth, Texas",
      "locations": [
        {
          "city": "Fort Worth",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07271316"
    },
    {
      "nct_id": "NCT03733418",
      "title": "Vitamin D to Improve Outcomes by Leveraging Early Treatment: Long-term Brain Outcomes in Vitamin D Deficient Patients",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cognitive Decline"
      ],
      "interventions": [
        {
          "name": "540,000 IU vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vanderbilt University Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 95,
      "start_date": "2018-11-01",
      "completion_date": "2020-02-21",
      "has_results": true,
      "last_update_posted_date": "2024-10-21",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 7,
      "location_summary": "Aurora, Colorado • Boston, Massachusetts • New York, New York + 3 more",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03733418"
    },
    {
      "nct_id": "NCT00103740",
      "title": "Safety and Efficacy Trial With Zoledronic Acid for the Treatment of Paget's Disease of Bone, Including an Extended Observation Period",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Paget's Disease of Bone"
      ],
      "interventions": [
        {
          "name": "zoledronic acid",
          "type": "DRUG"
        },
        {
          "name": "placebo to zoledronic acid",
          "type": "DRUG"
        },
        {
          "name": "Risedronate",
          "type": "DRUG"
        },
        {
          "name": "Placebo to risedronate",
          "type": "DRUG"
        },
        {
          "name": "Calcium and vitamin D supplements",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "30 Years and older"
      },
      "enrollment_count": 185,
      "start_date": "2002-04",
      "completion_date": "2011-04",
      "has_results": true,
      "last_update_posted_date": "2012-06-04",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 10,
      "location_summary": "Tucson, Arizona • Colorado Springs, Colorado • Indianapolis, Indiana + 7 more",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Colorado Springs",
          "state": "Colorado"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "New Orleans",
          "state": "Louisiana"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00103740"
    },
    {
      "nct_id": "NCT05459298",
      "title": "ViDES Trial (Vitamin D Extra Supplementation)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "800 IU/day vitamin D supplementation with feedings in the first 28 days after birth",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Usual Care",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "The University of Texas Health Science Center, Houston",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "24 Hours",
        "maximum_age": "96 Hours",
        "sex": "ALL",
        "summary": "24 Hours to 96 Hours"
      },
      "enrollment_count": 180,
      "start_date": "2022-09-06",
      "completion_date": "2027-12-01",
      "has_results": false,
      "last_update_posted_date": "2026-06-11",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05459298"
    },
    {
      "nct_id": "NCT01008384",
      "title": "The Effect of Vitamin D Repletion on Small Low Density Lipoprotein (LDL) Particle Number in Subjects at Elevated Cardiovascular Risk",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Atherosclerosis"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Rockefeller 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": 150,
      "start_date": "2009-10",
      "completion_date": "2011-10",
      "has_results": false,
      "last_update_posted_date": "2012-06-01",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01008384"
    },
    {
      "nct_id": "NCT00427037",
      "title": "Cholecalciferol (Vitamin D3) Therapy in Chronic Kidney Disease (CKD) Subjects",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chronic Kidney Disease",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Atlanta VA Medical Center",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "18 Years to 85 Years"
      },
      "enrollment_count": 34,
      "start_date": "2005-12",
      "completion_date": "2013-03",
      "has_results": true,
      "last_update_posted_date": "2015-07-22",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00427037"
    },
    {
      "nct_id": "NCT01052051",
      "title": "Clinical Trial of Vitamin D3 to Reduce Cancer Risk in Postmenopausal Women",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Cancer"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Calcium carbonate",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Creighton University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "55 Years and older · Female only"
      },
      "enrollment_count": 2303,
      "start_date": "2009-06",
      "completion_date": "2015-08",
      "has_results": false,
      "last_update_posted_date": "2019-07-24",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 1,
      "location_summary": "Fremont, Nebraska",
      "locations": [
        {
          "city": "Fremont",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01052051"
    },
    {
      "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": "2026-10-13T21:19:30.712Z",
      "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": "NCT02969850",
      "title": "A New Paradigm for Vitamin D Sufficiency",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "New Biomarkers for Measuring Vitamin D Level"
      ],
      "interventions": [
        {
          "name": "Vitamin D Supplementation",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        },
        {
          "name": "Calcium",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "NYU Langone Health",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": "90 Years",
        "sex": "FEMALE",
        "summary": "60 Years to 90 Years · Female only"
      },
      "enrollment_count": 444,
      "start_date": "2016-02",
      "completion_date": "2019-12-01",
      "has_results": false,
      "last_update_posted_date": "2021-10-22",
      "last_synced_at": "2026-10-13T21:19:30.712Z",
      "location_count": 1,
      "location_summary": "Mineola, New York",
      "locations": [
        {
          "city": "Mineola",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02969850"
    }
  ]
}