{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+placebo&page=11",
    "query": {
      "intervention": "Vitamin D placebo",
      "page": 11
    },
    "page_size": 10
  },
  "pagination": {
    "page": 11,
    "page_size": 10,
    "total_count": 437,
    "total_pages": 44,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+placebo&page=12&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+placebo&page=10&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-14T22:40:02.063Z",
  "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": "NCT01395823",
      "title": "Safety and Effects of Supplementation With Ergocalciferol on Erythropoietin Dosing in Hemodialysis Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "End Stage Renal Disease"
      ],
      "interventions": [
        {
          "name": "ergocalciferol supplementation",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Dialysis Clinic, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 470,
      "start_date": "2011-06",
      "completion_date": "2015-06",
      "has_results": true,
      "last_update_posted_date": "2016-03-14",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 12,
      "location_summary": "Redding, California • Albany, Georgia • Shreveport, Louisiana + 9 more",
      "locations": [
        {
          "city": "Redding",
          "state": "California"
        },
        {
          "city": "Albany",
          "state": "Georgia"
        },
        {
          "city": "Shreveport",
          "state": "Louisiana"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Columbia",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01395823"
    },
    {
      "nct_id": "NCT01314443",
      "title": "Impact of Smoking Cessation and γ-Tocopherol to Restore Vascular Endothelial Function",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Endothelial Dysfunction"
      ],
      "interventions": [
        {
          "name": "Nicotine Replacement Therapy (NRT)",
          "type": "OTHER"
        },
        {
          "name": "Gamma-Tocopherol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        },
        {
          "name": "Smoking cessation",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DIETARY_SUPPLEMENT",
        "BEHAVIORAL"
      ],
      "sponsor": "University of Connecticut",
      "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": 67,
      "start_date": "2011-01",
      "completion_date": "2014-12",
      "has_results": true,
      "last_update_posted_date": "2015-01-21",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 1,
      "location_summary": "Storrs, Connecticut",
      "locations": [
        {
          "city": "Storrs",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01314443"
    },
    {
      "nct_id": "NCT01769625",
      "title": "Changes in Biomarkers Using Prostaglandin Inhibitors",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Biomarker Change Linked to Breast Cancer"
      ],
      "interventions": [
        {
          "name": "placebo/celecoxib 400 mg and cholecalciferol 400 IU/cholecalciferol 2,000 IU",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Hartford Hospital",
      "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": 31,
      "start_date": "2009-01",
      "completion_date": "2016-11",
      "has_results": false,
      "last_update_posted_date": "2017-08-09",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 1,
      "location_summary": "Grand Forks, North Dakota",
      "locations": [
        {
          "city": "Grand Forks",
          "state": "North Dakota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01769625"
    },
    {
      "nct_id": "NCT01653678",
      "title": "Vitamin D and Omega-3 Hypertension Trial (VITAL Hypertension)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Vitamin D-3 (cholecalciferol), 2000 IU",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Omega-3 fatty acids (fish oil)",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Fish oil placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "99 Years",
        "sex": "ALL",
        "summary": "50 Years to 99 Years"
      },
      "enrollment_count": 25875,
      "start_date": "2011-11",
      "completion_date": "2026-06",
      "has_results": false,
      "last_update_posted_date": "2025-12-18",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01653678"
    },
    {
      "nct_id": "NCT00249704",
      "title": "Randomized Study Of Exercise And Vitamin D In Frail Elderly Subjects",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Elderly, Frail"
      ],
      "interventions": [
        {
          "name": "Vitamin D + Sham Exercise",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D Placebo + Exercise",
          "type": "PROCEDURE"
        },
        {
          "name": "Vitamin D Placebo + Sham Exercise",
          "type": "PROCEDURE"
        },
        {
          "name": "Vitamin D + Exercise",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG",
        "PROCEDURE"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "75 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "75 Years and older"
      },
      "enrollment_count": 64,
      "start_date": "2005-10",
      "completion_date": "2008-01",
      "has_results": false,
      "last_update_posted_date": "2009-01-08",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 4,
      "location_summary": "Farmington, Connecticut • Hyattsville, Maryland • Roslindale, Massachusetts + 1 more",
      "locations": [
        {
          "city": "Farmington",
          "state": "Connecticut"
        },
        {
          "city": "Hyattsville",
          "state": "Maryland"
        },
        {
          "city": "Roslindale",
          "state": "Massachusetts"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00249704"
    },
    {
      "nct_id": "NCT01419743",
      "title": "Effect of Vitamin D Supplementation on In-vitro Fertilization (IVF) Outcomes",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Infertility",
        "Vitamin D Deficiency"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "38 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 38 Years · Female only"
      },
      "enrollment_count": 102,
      "start_date": "2011-08",
      "completion_date": "2014-01",
      "has_results": false,
      "last_update_posted_date": "2014-02-19",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 3,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01419743"
    },
    {
      "nct_id": "NCT01922843",
      "title": "A Phase 2 Study of an Oral Vitamin D Compound (DP001) in Secondary Hyperparathyroidism in Patients on Hemodialysis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Hyperparathyroidism, Secondary",
        "Kidney Failure, Chronic"
      ],
      "interventions": [
        {
          "name": "DP001 softgel capsules",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Deltanoid Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 62,
      "start_date": "2013-09",
      "completion_date": "2014-06",
      "has_results": false,
      "last_update_posted_date": "2017-08-18",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 14,
      "location_summary": "Phoenix, Arizona • Tucson, Arizona • Washington D.C., District of Columbia + 11 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Evanston",
          "state": "Illinois"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01922843"
    },
    {
      "nct_id": "NCT04286529",
      "title": "Effect of 1,25-dihydroxyvitamin D3, Treatment on Insulin Secretion and Muscle Strength in Pre-diabetic Persons",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Pre-Diabetic"
      ],
      "interventions": [
        {
          "name": "Calcitriol capsules",
          "type": "DRUG"
        },
        {
          "name": "Oral Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "20 Years to 45 Years"
      },
      "enrollment_count": 17,
      "start_date": "2020-10-01",
      "completion_date": "2021-05-28",
      "has_results": true,
      "last_update_posted_date": "2022-04-18",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04286529"
    },
    {
      "nct_id": "NCT00048061",
      "title": "MOBILE Study - A Study of Bonviva (Ibandronate) Regimens in Women With Post-Menopausal Osteoporosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Post Menopausal Osteoporosis"
      ],
      "interventions": [
        {
          "name": "Ibandronate [Bonviva/Boniva]",
          "type": "DRUG"
        },
        {
          "name": "Calcium",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Hoffmann-La Roche",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": "80 Years",
        "sex": "FEMALE",
        "summary": "55 Years to 80 Years · Female only"
      },
      "enrollment_count": 1609,
      "start_date": "2002-04",
      "completion_date": "2004-12",
      "has_results": true,
      "last_update_posted_date": "2018-03-29",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 20,
      "location_summary": "Irvine, California • Loma Linda, California • Los Angeles, California + 17 more",
      "locations": [
        {
          "city": "Irvine",
          "state": "California"
        },
        {
          "city": "Loma Linda",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Oakland",
          "state": "California"
        },
        {
          "city": "Rancho Mirage",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00048061"
    },
    {
      "nct_id": "NCT00799383",
      "title": "Calcium and Vitamin D to Optimize Bone Mass in Boys With Risperidone-induced Hyperprolactinemia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Risperidone-induced Hyperprolactinemia"
      ],
      "interventions": [
        {
          "name": "Calcium and Vitamin D",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Chadi A. Calarge",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "17 Years",
        "sex": "MALE",
        "summary": "5 Years to 17 Years · Male only"
      },
      "enrollment_count": 47,
      "start_date": "2008-11",
      "completion_date": "2014-03",
      "has_results": true,
      "last_update_posted_date": "2017-12-26",
      "last_synced_at": "2026-10-14T22:40:02.063Z",
      "location_count": 1,
      "location_summary": "Iowa City, Iowa",
      "locations": [
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00799383"
    }
  ]
}