{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3-Placebo&page=4",
    "query": {
      "intervention": "Vitamin D3-Placebo",
      "page": 4
    },
    "page_size": 10
  },
  "pagination": {
    "page": 4,
    "page_size": 10,
    "total_count": 410,
    "total_pages": 41,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3-Placebo&page=5&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3-Placebo&page=3&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-07T05:41:18.276Z",
  "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": "NCT00870961",
      "title": "Vitamin D Supplement in Preventing Colon Cancer in African Americans With Colon Polyps",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer",
        "Precancerous Condition"
      ],
      "interventions": [
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 22,
      "start_date": "2009-02",
      "completion_date": "2012-06",
      "has_results": false,
      "last_update_posted_date": "2013-09-16",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 2,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00870961"
    },
    {
      "nct_id": "NCT00915876",
      "title": "Vascular Reactivity in Chronic Kidney Disease (CKD) Patients Receiving Paricalcitol Versus Placebo",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "Paricalcitol",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Amy Barton Pai",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 41,
      "start_date": "2009-03",
      "completion_date": "2011-03",
      "has_results": true,
      "last_update_posted_date": "2016-12-02",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 1,
      "location_summary": "Albany, New York",
      "locations": [
        {
          "city": "Albany",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00915876"
    },
    {
      "nct_id": "NCT01199926",
      "title": "Effect of Vitamin D Supplementation on Muscle Mass and Function",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Obesity",
        "Insulin Resistance",
        "Inflammation"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Purdue University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "18 Years to 35 Years"
      },
      "enrollment_count": 34,
      "start_date": "2008-08",
      "completion_date": "2010-02",
      "has_results": true,
      "last_update_posted_date": "2015-05-15",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 1,
      "location_summary": "West Lafayette, Indiana",
      "locations": [
        {
          "city": "West Lafayette",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01199926"
    },
    {
      "nct_id": "NCT02590614",
      "title": "Genetic, Dietary and Environmental Influences on Vitamin D Metabolism",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "800 IU Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Milton S. Hershey Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "18 Years to 35 Years"
      },
      "enrollment_count": 412,
      "start_date": "2013-11",
      "completion_date": "2019-04-24",
      "has_results": false,
      "last_update_posted_date": "2019-05-08",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 1,
      "location_summary": "University Park, Pennsylvania",
      "locations": [
        {
          "city": "University Park",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02590614"
    },
    {
      "nct_id": "NCT00186901",
      "title": "A Severity-Adapted Clinical Trial of Diminished Bone Mineral Density in Acute Lymphoblastic Leukemia Survivors",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Leukemia, Lymphoblastic, Acute",
        "Osteoporosis"
      ],
      "interventions": [
        {
          "name": "Calcium carbonate (Tums), vitamin D",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "St. Jude Children's Research Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 429,
      "start_date": "2000-07",
      "completion_date": "2011-09",
      "has_results": true,
      "last_update_posted_date": "2017-05-10",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 3,
      "location_summary": "Memphis, Tennessee",
      "locations": [
        {
          "city": "Memphis",
          "state": "Tennessee"
        },
        {
          "city": "Memphis",
          "state": "Tennessee"
        },
        {
          "city": "Memphis",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00186901"
    },
    {
      "nct_id": "NCT01736865",
      "title": "Vitamin D for Established Type 2 Diabetes (DDM2)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Type 2 Diabetes"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Tufts Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "25 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "25 Years to 75 Years"
      },
      "enrollment_count": 127,
      "start_date": "2012-12",
      "completion_date": "2015-08",
      "has_results": true,
      "last_update_posted_date": "2020-04-01",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 2,
      "location_summary": "Boston, Massachusetts • Cincinnati, Ohio",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01736865"
    },
    {
      "nct_id": "NCT00079001",
      "title": "Zoledronate in Preventing Skeletal (Bone)-Related Events in Men Who Are Receiving Androgen Deprivation Therapy For Prostate Cancer and Bone Metastases",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Metastatic Cancer",
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "zoledronic acid",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "OTHER"
        },
        {
          "name": "androgen deprivation therapy",
          "type": "DRUG"
        },
        {
          "name": "GnRH agonist",
          "type": "DRUG"
        },
        {
          "name": "Calcium supplement",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Alliance for Clinical Trials in Oncology",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 645,
      "start_date": "2004-01",
      "completion_date": "2014-10",
      "has_results": true,
      "last_update_posted_date": "2020-05-12",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 238,
      "location_summary": "Mobile, Alabama • Fort Smith, Arkansas • Little Rock, Arkansas + 159 more",
      "locations": [
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Fort Smith",
          "state": "Arkansas"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Loma Linda",
          "state": "California"
        },
        {
          "city": "Pismo Beach",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00079001"
    },
    {
      "nct_id": "NCT02757872",
      "title": "Effects of Vitamin D and Fish Oil on the Kidney in Hypertensives",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hypertension",
        "Kidney Diseases"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Omega-3 Fatty acids",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D3 placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Fish oil placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Albert Einstein College of Medicine",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "99 Years",
        "sex": "ALL",
        "summary": "50 Years to 99 Years"
      },
      "enrollment_count": 2232,
      "start_date": "2016-04",
      "completion_date": "2022-03-31",
      "has_results": true,
      "last_update_posted_date": "2024-05-31",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02757872"
    },
    {
      "nct_id": "NCT01329666",
      "title": "Primary Hyperparathyroidism (PHPT): Early Effect of Vitamin D",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Primary Hyperparathyroidism",
        "Hypercalcemia",
        "Vitamin D Deficiency",
        "Osteoporosis",
        "Osteopenia"
      ],
      "interventions": [
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "45 Years and older"
      },
      "enrollment_count": 0,
      "start_date": "2010-05",
      "completion_date": "2015-01",
      "has_results": false,
      "last_update_posted_date": "2015-03-05",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01329666"
    },
    {
      "nct_id": "NCT00050011",
      "title": "Zoledronic Acid - Letrozole Adjuvant Synergy Trial (ZFAST) - Cancer Treatment Related Bone Loss in Postmenopausal Women With Estrogen Receptor Positive and/or Progesterone Receptor Positive Breast Cancer Receiving Adjuvant Hormonal Therapy",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Neoplasms",
        "Osteoporosis"
      ],
      "interventions": [
        {
          "name": "Zoledronic Acid",
          "type": "DRUG"
        },
        {
          "name": "Letrozole",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "85 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 85 Years · Female only"
      },
      "enrollment_count": 602,
      "start_date": "2002-09",
      "completion_date": "2009-01",
      "has_results": true,
      "last_update_posted_date": "2014-03-21",
      "last_synced_at": "2026-10-07T05:41:18.276Z",
      "location_count": 43,
      "location_summary": "Springdale, Arkansas • Burbank, California • Lafayette, California + 39 more",
      "locations": [
        {
          "city": "Springdale",
          "state": "Arkansas"
        },
        {
          "city": "Burbank",
          "state": "California"
        },
        {
          "city": "Lafayette",
          "state": "California"
        },
        {
          "city": "LaVerne",
          "state": "California"
        },
        {
          "city": "Long Beach",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00050011"
    }
  ]
}