{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3+.",
    "query": {
      "intervention": "Vitamin D3 ."
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 962,
    "total_pages": 97,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D3+.&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-16T21:32:52.440Z",
  "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": "NCT01787409",
      "title": "Cholecalciferol in Improving Survival in Patients With Newly Diagnosed Cancer With Vitamin D Insufficiency",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Aggressive Non-Hodgkin Lymphoma",
        "Anaplastic Large Cell Lymphoma",
        "Angioimmunoblastic T-Cell Lymphoma",
        "Chronic Lymphocytic Leukemia",
        "Diffuse Large B-Cell Lymphoma",
        "Enteropathy-Associated T-Cell Lymphoma",
        "Hepatosplenic T-Cell Lymphoma",
        "Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma",
        "Mediastinal (Thymic) Large B-Cell Lymphoma",
        "Nasal Type Extranodal NK/T-Cell Lymphoma",
        "Peripheral T-Cell Lymphoma, Not Otherwise Specified",
        "Primary Cutaneous Anaplastic Large Cell Lymphoma",
        "Refractory Anaplastic Large Cell Lymphoma",
        "Small Lymphocytic Lymphoma",
        "Subcutaneous Panniculitis-Like T-Cell Lymphoma"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "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": 565,
      "start_date": "2013-03-06",
      "completion_date": "2028-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-06-16",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 5,
      "location_summary": "Scottsdale, Arizona • Atlanta, Georgia • Iowa City, Iowa + 2 more",
      "locations": [
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01787409"
    },
    {
      "nct_id": "NCT02945410",
      "title": "Effect of Caloric Restriction and Protein Intake on Metabolism and Anabolic Sensitivity",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Weight Loss",
        "Starvation"
      ],
      "interventions": [
        {
          "name": "Caloric Restriction",
          "type": "OTHER"
        },
        {
          "name": "Protein",
          "type": "OTHER"
        },
        {
          "name": "Exercise",
          "type": "OTHER"
        },
        {
          "name": "Calcium and Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Maltodextrin",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Nebraska Lincoln",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": "30 Years",
        "sex": "MALE",
        "summary": "19 Years to 30 Years · Male only"
      },
      "enrollment_count": 20,
      "start_date": "2016-09",
      "completion_date": "2019-02",
      "has_results": true,
      "last_update_posted_date": "2019-12-19",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 1,
      "location_summary": "Lincoln, Nebraska",
      "locations": [
        {
          "city": "Lincoln",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02945410"
    },
    {
      "nct_id": "NCT02138591",
      "title": "Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Vitamin d Deficiency"
      ],
      "interventions": [
        {
          "name": "Blood draw pre-operatively",
          "type": "PROCEDURE"
        },
        {
          "name": "Blood draw post-operative Day 1",
          "type": "PROCEDURE"
        },
        {
          "name": "Blood draw post-operative Day 2",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "University of Missouri, Kansas City",
      "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": "2016-02",
      "completion_date": "2016-05",
      "has_results": false,
      "last_update_posted_date": "2017-06-16",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 1,
      "location_summary": "Kansas City, Missouri",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02138591"
    },
    {
      "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": "2026-09-16T21:32:52.440Z",
      "location_count": 1,
      "location_summary": "Phoenix, Arizona",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03176849"
    },
    {
      "nct_id": "NCT05459298",
      "title": "ViDES Trial (Vitamin D Extra Supplementation)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "800 IU/day vitamin D supplementation with feedings in the first 28 days after birth",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Usual Care",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "The University of Texas Health Science Center, Houston",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "24 Hours",
        "maximum_age": "96 Hours",
        "sex": "ALL",
        "summary": "24 Hours to 96 Hours"
      },
      "enrollment_count": 180,
      "start_date": "2022-09-06",
      "completion_date": "2027-12-01",
      "has_results": false,
      "last_update_posted_date": "2026-06-11",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05459298"
    },
    {
      "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": "2026-09-16T21:32:52.440Z",
      "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": "NCT01274104",
      "title": "A Pilot Study on the Effect of Vitamin D Treatment in Patients With Statin-Associated Myalgia",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Hyperlipidemia"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Avera McKennan Hospital & University Health Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "88 Years",
        "sex": "ALL",
        "summary": "18 Years to 88 Years"
      },
      "enrollment_count": 0,
      "start_date": "2010-10",
      "completion_date": "2011-07",
      "has_results": false,
      "last_update_posted_date": "2015-04-22",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 1,
      "location_summary": "Sioux Falls, South Dakota",
      "locations": [
        {
          "city": "Sioux Falls",
          "state": "South Dakota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01274104"
    },
    {
      "nct_id": "NCT01617109",
      "title": "Optimizing Vitamin D Status During Initial Military Training",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Bone Health",
        "Nutrition Status"
      ],
      "interventions": [
        {
          "name": "Ca/Vit D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "United States Army Research Institute of Environmental Medicine",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "17 Years",
        "maximum_age": "42 Years",
        "sex": "ALL",
        "summary": "17 Years to 42 Years"
      },
      "enrollment_count": 342,
      "start_date": "2012-06",
      "completion_date": "2018-05-02",
      "has_results": false,
      "last_update_posted_date": "2018-10-11",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 2,
      "location_summary": "Fort Sill, Oklahoma • San Antonio, Texas",
      "locations": [
        {
          "city": "Fort Sill",
          "state": "Oklahoma"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01617109"
    },
    {
      "nct_id": "NCT01103934",
      "title": "Vitamin D Plus Fluticasone Propionate",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Seasonal Allergic Rhinitis"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Fluticasone Propionate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 35,
      "start_date": "2010-06",
      "completion_date": "2011-07",
      "has_results": true,
      "last_update_posted_date": "2014-10-09",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01103934"
    },
    {
      "nct_id": "NCT04615988",
      "title": "Correlation Vitamin D Level to Endocrine Autoimmune Toxicity Due to Immune Checkpoint Inhibitors",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Thyroid",
        "PD-1",
        "Cancer"
      ],
      "interventions": [
        {
          "name": "blood draw and questionnaire completion",
          "type": "OTHER"
        },
        {
          "name": "questionnaire completion, blood collection",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Icahn School of Medicine at Mount Sinai",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 17,
      "start_date": "2021-06-09",
      "completion_date": "2028-06",
      "has_results": false,
      "last_update_posted_date": "2026-03-27",
      "last_synced_at": "2026-09-16T21:32:52.440Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04615988"
    }
  ]
}