{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=High-Dose+Vitamin+D3",
    "query": {
      "intervention": "High-Dose Vitamin D3"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 120,
    "total_pages": 12,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=High-Dose+Vitamin+D3&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-17T08:05:05.649Z",
  "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": "NCT03176849",
      "title": "A Randomized Phase IV Control Trial of Single High Dose Oral Vitamin D3 in Pediatric Patients Undergoing HSCT",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Stem Cell Transplant Complications",
        "Pediatric Cancer",
        "Blood Disorder",
        "Pediatric Acute Myeloid Leukemia",
        "Pediatric Acute Lymphoid Leukemia",
        "Myelodysplastic Syndromes",
        "Sickle Cell Anemia in Children",
        "Aplastic Anemia",
        "Thalassemia in Children"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Standard Vitamin D3 Supplementation",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Phoenix Children's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "1 Year",
        "maximum_age": "25 Years",
        "sex": "ALL",
        "summary": "1 Year to 25 Years"
      },
      "enrollment_count": 49,
      "start_date": "2017-11-01",
      "completion_date": "2019-07-01",
      "has_results": false,
      "last_update_posted_date": "2020-11-17",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "Phoenix, Arizona",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03176849"
    },
    {
      "nct_id": "NCT02138838",
      "title": "Efficacy and Safety of Cinacalcet in Pediatric Patients With Secondary Hyperparathyroidism (SHPT) and Chronic Kidney Disease (CKD) on Dialysis",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Chronic Kidney Disease, Secondary Hyperparathyroidism"
      ],
      "interventions": [
        {
          "name": "Cinacalcet HCl",
          "type": "DRUG"
        },
        {
          "name": "Standard of Care",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Amgen",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "6 Years to 17 Years"
      },
      "enrollment_count": 55,
      "start_date": "2014-11-07",
      "completion_date": "2016-06-23",
      "has_results": true,
      "last_update_posted_date": "2020-06-29",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 26,
      "location_summary": "Los Angeles, California • Wilmington, Delaware • Atlanta, Georgia + 22 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Wilmington",
          "state": "Delaware"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02138838"
    },
    {
      "nct_id": "NCT00470353",
      "title": "Cholecalciferol and Calcium Carbonate in Treating Patients With Colon Cancer That Has Been Removed by Surgery",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer"
      ],
      "interventions": [
        {
          "name": "calcium carbonate",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "immunohistochemistry staining method",
          "type": "OTHER"
        },
        {
          "name": "laboratory biomarker analysis",
          "type": "OTHER"
        },
        {
          "name": "pharmacological study",
          "type": "OTHER"
        },
        {
          "name": "biopsy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "Roswell Park Cancer Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "120 Years",
        "sex": "ALL",
        "summary": "18 Years to 120 Years"
      },
      "enrollment_count": 8,
      "start_date": "2006-09",
      "completion_date": "2009-09",
      "has_results": false,
      "last_update_posted_date": "2023-08-04",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "Buffalo, New York",
      "locations": [
        {
          "city": "Buffalo",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00470353"
    },
    {
      "nct_id": "NCT01126671",
      "title": "Vitamin D Supplementation in Healthy Adolescents",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Supplementation"
      ],
      "interventions": [
        {
          "name": "Supplemental Vitamin D",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Boston Children's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "11 Years",
        "maximum_age": "18 Years",
        "sex": "ALL",
        "summary": "11 Years to 18 Years"
      },
      "enrollment_count": 56,
      "start_date": "2008-11",
      "completion_date": "2011-06",
      "has_results": true,
      "last_update_posted_date": "2018-06-04",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01126671"
    },
    {
      "nct_id": "NCT01508845",
      "title": "A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Tufts University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 61,
      "start_date": "2012-01",
      "completion_date": "2013-06",
      "has_results": false,
      "last_update_posted_date": "2014-07-21",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01508845"
    },
    {
      "nct_id": "NCT02603757",
      "title": "Effectiveness of High Dose Vitamin D Supplementation in Stage III Colorectal Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colon Cancer",
        "Rectal Cancer"
      ],
      "interventions": [
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Legacy Health System",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "99 Years",
        "sex": "ALL",
        "summary": "18 Years to 99 Years"
      },
      "enrollment_count": 70,
      "start_date": "2016-03",
      "completion_date": "2020-06",
      "has_results": false,
      "last_update_posted_date": "2020-10-01",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 3,
      "location_summary": "Gresham, Oregon • Portland, Oregon • Tualatin, Oregon",
      "locations": [
        {
          "city": "Gresham",
          "state": "Oregon"
        },
        {
          "city": "Portland",
          "state": "Oregon"
        },
        {
          "city": "Tualatin",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02603757"
    },
    {
      "nct_id": "NCT02225899",
      "title": "BioEnergetics and Metabolomics in Cystic Fibrosis",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 50,
      "start_date": "2014-09",
      "completion_date": "2018-11-07",
      "has_results": false,
      "last_update_posted_date": "2019-11-29",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02225899"
    },
    {
      "nct_id": "NCT03759262",
      "title": "Ultra-high Dose Vitamin D for HSCT",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Hematopoietic Stem Cell Transplant"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Children's Hospital Los Angeles",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "0 Years",
        "maximum_age": "25 Years",
        "sex": "ALL",
        "summary": "0 Years to 25 Years"
      },
      "enrollment_count": 33,
      "start_date": "2018-12-10",
      "completion_date": "2020-05-10",
      "has_results": false,
      "last_update_posted_date": "2024-05-20",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03759262"
    },
    {
      "nct_id": "NCT00748618",
      "title": "Vitamin D Replacement After Kidney Transplant",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Kidney Transplantation",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Standard vitamin D3 treatment",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "High dose vitamin D3 treatment",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "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": 116,
      "start_date": "2008-10-01",
      "completion_date": "2023-06-08",
      "has_results": true,
      "last_update_posted_date": "2024-10-26",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00748618"
    },
    {
      "nct_id": "NCT06266702",
      "title": "Evaluation of a Nutritional Technology for Vitamin D Absorption",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Nutrition, Healthy"
      ],
      "interventions": [
        {
          "name": "Experimental Oil with Phospholipids",
          "type": "OTHER"
        },
        {
          "name": "Control Polyunsaturated Oil Blend",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Abbott Nutrition",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 26,
      "start_date": "2024-03-15",
      "completion_date": "2024-05-02",
      "has_results": false,
      "last_update_posted_date": "2024-07-31",
      "last_synced_at": "2026-09-17T08:05:05.649Z",
      "location_count": 1,
      "location_summary": "North Canton, Ohio",
      "locations": [
        {
          "city": "North Canton",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06266702"
    }
  ]
}