{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=High+Dose+Vitamin+D&page=2",
    "query": {
      "intervention": "High Dose Vitamin D",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 130,
    "total_pages": 13,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=High+Dose+Vitamin+D&page=3&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=High+Dose+Vitamin+D&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-06T23:03:45.800Z",
  "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": "NCT01561989",
      "title": "Cholecalciferol and Flu Vaccine in Treating Healthy Participants",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy, no Evidence of Disease"
      ],
      "interventions": [
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "questionnaire administration",
          "type": "OTHER"
        },
        {
          "name": "trivalent influenza vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER",
        "BIOLOGICAL"
      ],
      "sponsor": "Roswell Park Cancer Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "18 Years to 64 Years"
      },
      "enrollment_count": 11,
      "start_date": "2011-10",
      "completion_date": "2015-06",
      "has_results": true,
      "last_update_posted_date": "2020-03-10",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 1,
      "location_summary": "Buffalo, New York",
      "locations": [
        {
          "city": "Buffalo",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01561989"
    },
    {
      "nct_id": "NCT03270709",
      "title": "Effect of High-Dose Vitamin D3 in Smokers and Non-Smokers With and Without HIV",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "HIV/AIDS",
        "Vitamin D Deficiency",
        "Smoker Lung"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 450,000 IU orally",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 7,
      "start_date": "2018-04-11",
      "completion_date": "2018-10-15",
      "has_results": false,
      "last_update_posted_date": "2021-04-21",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 2,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03270709"
    },
    {
      "nct_id": "NCT01079923",
      "title": "Pilot Pharmacokinetic Study of Daily Versus Monthly High-Dose Cholecalciferol Supplementation",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy Volunteers"
      ],
      "interventions": [
        {
          "name": "Single High Dose Cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Daily Dose Cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 40 Years · Female only"
      },
      "enrollment_count": 40,
      "start_date": "2010-02",
      "completion_date": "2010-06",
      "has_results": false,
      "last_update_posted_date": "2012-11-20",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01079923"
    },
    {
      "nct_id": "NCT01354262",
      "title": "Effect of Vitamin D Supplementation on Hemoglobin A1c",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Diabetes Mellitus",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Ascension Health",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "34 Years",
        "maximum_age": "69 Years",
        "sex": "ALL",
        "summary": "34 Years to 69 Years"
      },
      "enrollment_count": 150,
      "start_date": "2011-03",
      "completion_date": "2012-06",
      "has_results": false,
      "last_update_posted_date": "2015-04-23",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 1,
      "location_summary": "Flint, Michigan",
      "locations": [
        {
          "city": "Flint",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01354262"
    },
    {
      "nct_id": "NCT03994172",
      "title": "Novel Combination Therapy for Osteoporosis in Men",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Male Osteoporosis"
      ],
      "interventions": [
        {
          "name": "Teriparatide or human parathyroid hormone (PTH) 1-34",
          "type": "DRUG"
        },
        {
          "name": "Cinacalcet",
          "type": "DRUG"
        },
        {
          "name": "placebo tablet",
          "type": "DRUG"
        },
        {
          "name": "Calcium citrate tablet",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": "85 Years",
        "sex": "MALE",
        "summary": "60 Years to 85 Years · Male only"
      },
      "enrollment_count": 40,
      "start_date": "2019-07-01",
      "completion_date": "2025-06-30",
      "has_results": true,
      "last_update_posted_date": "2026-09-03",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03994172"
    },
    {
      "nct_id": "NCT01331148",
      "title": "High Dose Vitamin D for Sickle Cell Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Sickle Cell Disease"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Wake Forest University Health Sciences",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "7 Years",
        "maximum_age": "21 Years",
        "sex": "ALL",
        "summary": "7 Years to 21 Years"
      },
      "enrollment_count": 46,
      "start_date": "2009-02",
      "completion_date": "2013-12",
      "has_results": true,
      "last_update_posted_date": "2022-08-09",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01331148"
    },
    {
      "nct_id": "NCT03418038",
      "title": "Ascorbic Acid and Chemotherapy for the Treatment of Relapsed or Refractory Lymphoma, CCUS, and Chronic Myelomonocytic Leukemia",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Clonal Cytopenia of Undetermined Significance",
        "High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements",
        "Recurrent Diffuse Large B-Cell Lymphoma",
        "Recurrent Hodgkin Lymphoma",
        "Recurrent Lymphoma",
        "Refractory Diffuse Large B-Cell Lymphoma",
        "Refractory Lymphoma",
        "Chronic Myelomonocytic Leukemia"
      ],
      "interventions": [
        {
          "name": "Ascorbic Acid",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Carboplatin",
          "type": "DRUG"
        },
        {
          "name": "Cisplatin",
          "type": "DRUG"
        },
        {
          "name": "Cytarabine",
          "type": "DRUG"
        },
        {
          "name": "Dexamethasone",
          "type": "DRUG"
        },
        {
          "name": "Etoposide",
          "type": "DRUG"
        },
        {
          "name": "Gemcitabine Hydrochloride",
          "type": "DRUG"
        },
        {
          "name": "Ifosfamide",
          "type": "DRUG"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Oxaliplatin",
          "type": "DRUG"
        },
        {
          "name": "Placebo Administration",
          "type": "OTHER"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        },
        {
          "name": "Rituximab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Decitabine",
          "type": "DRUG"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Core Biopsy",
          "type": "PROCEDURE"
        },
        {
          "name": "Bone Marrow Aspiration",
          "type": "PROCEDURE"
        },
        {
          "name": "Bone Marrow Biopsy",
          "type": "PROCEDURE"
        },
        {
          "name": "Echocardiography",
          "type": "PROCEDURE"
        },
        {
          "name": "Positron Emission Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Central Venous Cannula Insertion",
          "type": "PROCEDURE"
        },
        {
          "name": "Portacath Placement",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Decitabine and Cedazuridine",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG",
        "OTHER",
        "BIOLOGICAL",
        "PROCEDURE"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 80,
      "start_date": "2018-03-23",
      "completion_date": "2033-11-02",
      "has_results": false,
      "last_update_posted_date": "2026-09-28",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 4,
      "location_summary": "Mankato, Minnesota • Rochester, Minnesota • Eau Claire, Wisconsin + 1 more",
      "locations": [
        {
          "city": "Mankato",
          "state": "Minnesota"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "Eau Claire",
          "state": "Wisconsin"
        },
        {
          "city": "La Crosse",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03418038"
    },
    {
      "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": "2026-10-06T23:03:45.800Z",
      "location_count": 1,
      "location_summary": "Phoenix, Arizona",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03176849"
    },
    {
      "nct_id": "NCT03307785",
      "title": "Study of Niraparib, TSR-022, Bevacizumab, and Platinum-Based Doublet Chemotherapy in Combination With TSR-042",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Neoplasms",
        "Metastatic Cancer",
        "Advanced Cancer",
        "Solid Tumor",
        "Non Small Cell Lung Cancer Metastatic",
        "Non Small Cell Lung Cancer Stage IIIB",
        "Non Small Cell Lung Cancer"
      ],
      "interventions": [
        {
          "name": "Niraparib",
          "type": "DRUG"
        },
        {
          "name": "TSR-042",
          "type": "DRUG"
        },
        {
          "name": "Carboplatin-Paclitaxel",
          "type": "DRUG"
        },
        {
          "name": "Bevacizumab",
          "type": "DRUG"
        },
        {
          "name": "TSR-022",
          "type": "DRUG"
        },
        {
          "name": "Carboplatin-Pemetrexed",
          "type": "DRUG"
        },
        {
          "name": "Carboplatin-Nab-Paclitaxel",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Tesaro, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 60,
      "start_date": "2017-10-12",
      "completion_date": "2024-12-11",
      "has_results": true,
      "last_update_posted_date": "2025-11-25",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 8,
      "location_summary": "Scottsdale, Arizona • Encinitas, California • San Marcos, California + 5 more",
      "locations": [
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Encinitas",
          "state": "California"
        },
        {
          "city": "San Marcos",
          "state": "California"
        },
        {
          "city": "Sarasota",
          "state": "Florida"
        },
        {
          "city": "Canton",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03307785"
    },
    {
      "nct_id": "NCT05977179",
      "title": "Dietary Intervention to Mitigate Post-Acute COVID-19 Syndrome",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Post-Acute COVID-19 Syndrome",
        "Fatigue"
      ],
      "interventions": [
        {
          "name": "Dietary intervention to mitigate Post-Acute COVID-19 Syndrome",
          "type": "OTHER"
        },
        {
          "name": "Attention Control",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "94 Years",
        "sex": "ALL",
        "summary": "50 Years to 94 Years"
      },
      "enrollment_count": 56,
      "start_date": "2025-05-12",
      "completion_date": "2028-09-30",
      "has_results": false,
      "last_update_posted_date": "2026-06-23",
      "last_synced_at": "2026-10-06T23:03:45.800Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05977179"
    }
  ]
}