{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=cholecalciferol+%28vitamin+D%29&page=33",
    "query": {
      "intervention": "cholecalciferol (vitamin D)",
      "page": 33
    },
    "page_size": 10
  },
  "pagination": {
    "page": 33,
    "page_size": 10,
    "total_count": 960,
    "total_pages": 96,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=cholecalciferol+%28vitamin+D%29&page=34&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=cholecalciferol+%28vitamin+D%29&page=32&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-16T23:49:53.596Z",
  "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": "NCT05084248",
      "title": "Vitamin D Deficiency in Adults Following a Major Burn Injury",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Burns"
      ],
      "interventions": [
        {
          "name": "Ergocalciferol Capsules",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Texas Southwestern 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": 48,
      "start_date": "2022-09-29",
      "completion_date": "2025-08-18",
      "has_results": false,
      "last_update_posted_date": "2025-12-15",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05084248"
    },
    {
      "nct_id": "NCT00033826",
      "title": "Role of Fat Tissue in Vitamin D Metabolism",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Vitamin D",
        "Adipose Tissue"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Tufts University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 41,
      "start_date": "2002-04",
      "completion_date": "2007-09",
      "has_results": false,
      "last_update_posted_date": "2013-05-24",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00033826"
    },
    {
      "nct_id": "NCT00571285",
      "title": "Clinical Effects of Vitamin D Repletion in Patients With Parkinson's Disease",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Parkinson's Disease"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3 - high dose",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "89 Years",
        "sex": "ALL",
        "summary": "18 Years to 89 Years"
      },
      "enrollment_count": 31,
      "start_date": "2007-06",
      "completion_date": "2015-09",
      "has_results": false,
      "last_update_posted_date": "2017-01-24",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00571285"
    },
    {
      "nct_id": "NCT01403051",
      "title": "High Dose Vitamin D and Calcium for Bone Health in Individuals Initiating HAART",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "HIV-1 Infection"
      ],
      "interventions": [
        {
          "name": "EFV/FTC/TDF",
          "type": "DRUG"
        },
        {
          "name": "Calcium Carbonate",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Placebo for calcium carbonate",
          "type": "DRUG"
        },
        {
          "name": "Placebo for vitamin D3",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Advancing Clinical Therapeutics Globally for HIV/AIDS and Other Infections",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 167,
      "start_date": "2011-09",
      "completion_date": "2013-02",
      "has_results": true,
      "last_update_posted_date": "2018-10-12",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 38,
      "location_summary": "Birmingham, Alabama • Los Angeles, California • Palo Alto, California + 27 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01403051"
    },
    {
      "nct_id": "NCT01593501",
      "title": "How Does Magnesium Status Influence Calcium Homeostasis?",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Magnesium Deficiency",
        "Calcium Metabolism Disorders"
      ],
      "interventions": [
        {
          "name": "vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "75 Years",
        "sex": "FEMALE",
        "summary": "30 Years to 75 Years · Female only"
      },
      "enrollment_count": 39,
      "start_date": "2012-05",
      "completion_date": "2014-08",
      "has_results": false,
      "last_update_posted_date": "2016-11-01",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "Madison, Wisconsin",
      "locations": [
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01593501"
    },
    {
      "nct_id": "NCT00043719",
      "title": "Nitroglycerin Ointment for Preventing Bone Loss in Postmenopausal Women",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Osteoporosis",
        "Osteopenia"
      ],
      "interventions": [
        {
          "name": "Nitroglycerin ointment",
          "type": "DRUG"
        },
        {
          "name": "Calcium supplement with vitamin D",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "65 Years",
        "sex": "FEMALE",
        "summary": "40 Years to 65 Years · Female only"
      },
      "enrollment_count": 200,
      "start_date": "2002-07",
      "completion_date": "2007-12",
      "has_results": false,
      "last_update_posted_date": "2009-02-02",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "New Brunswick, New Jersey",
      "locations": [
        {
          "city": "New Brunswick",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00043719"
    },
    {
      "nct_id": "NCT01890772",
      "title": "Vitamin D + Telaprevir + Peginterferon + Ribavirin for of Hepatitis C Genotype 1",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Hepatitis C"
      ],
      "interventions": [
        {
          "name": "Telaprevir",
          "type": "DRUG"
        },
        {
          "name": "Peginterferon alfa-2a",
          "type": "DRUG"
        },
        {
          "name": "Ribavirin",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Timothy Morgan, MD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 0,
      "start_date": "2013-08",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2014-05-14",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 4,
      "location_summary": "Long Beach, California • Minneapolis, Minnesota • Kansas City, Missouri + 1 more",
      "locations": [
        {
          "city": "Long Beach",
          "state": "California"
        },
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        },
        {
          "city": "Kansas City",
          "state": "Missouri"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01890772"
    },
    {
      "nct_id": "NCT03046927",
      "title": "Vitamin D and Residual Beta-Cell Function in Type 1 Diabetes",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Type 1 Diabetes"
      ],
      "interventions": [
        {
          "name": "Ergocalciferol",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Benjamin U. Nwosu, MD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "10 Years",
        "maximum_age": "21 Years",
        "sex": "ALL",
        "summary": "10 Years to 21 Years"
      },
      "enrollment_count": 48,
      "start_date": "2017-10-19",
      "completion_date": "2021-04-20",
      "has_results": true,
      "last_update_posted_date": "2024-07-10",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "Worcester, Massachusetts",
      "locations": [
        {
          "city": "Worcester",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03046927"
    },
    {
      "nct_id": "NCT07199829",
      "title": "Evaluating Response to Vitamin D3 and K2 Supplementation in Healthcare Personnel",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypovitaminosis D",
        "Hypovitaminosis"
      ],
      "interventions": [
        {
          "name": "Vitamin Arm 1",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin Arm 2",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin Arm 3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Madigan Army Medical Center",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "69 Years",
        "sex": "ALL",
        "summary": "18 Years to 69 Years"
      },
      "enrollment_count": 96,
      "start_date": "2025-03-27",
      "completion_date": "2026-03",
      "has_results": false,
      "last_update_posted_date": "2025-09-30",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "Tacoma, Washington",
      "locations": [
        {
          "city": "Tacoma",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07199829"
    },
    {
      "nct_id": "NCT01371877",
      "title": "The Role of Vitamin D in Chronic Urticaria and Angioedema Treatment",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Urticaria",
        "Angioedema",
        "Hives",
        "Swelling"
      ],
      "interventions": [
        {
          "name": "High Dose Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Low Dose Vitamin D3",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Nebraska",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "19 Years and older"
      },
      "enrollment_count": 42,
      "start_date": "2011-11-01",
      "completion_date": "2013-09-01",
      "has_results": true,
      "last_update_posted_date": "2023-09-21",
      "last_synced_at": "2026-10-16T23:49:53.596Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01371877"
    }
  ]
}