{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=vitamin+d",
    "query": {
      "intervention": "vitamin d"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 1030,
    "total_pages": 103,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=vitamin+d&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-14T06:34:08.632Z",
  "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": "NCT01633658",
      "title": "The Variability of 25-hydroxyvitamin D Response From Crystalline 25-hydroxyvitamin D3",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "25(OH)D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Creighton University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "20 Years to 60 Years"
      },
      "enrollment_count": 0,
      "start_date": "2012-11",
      "completion_date": "2013-11",
      "has_results": false,
      "last_update_posted_date": "2013-05-29",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01633658"
    },
    {
      "nct_id": "NCT05058976",
      "title": "Romosozumab Use to Build Skeletal Integrity",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Osteoporosis",
        "Osteoporosis, Postmenopausal",
        "Osteoporosis Fracture"
      ],
      "interventions": [
        {
          "name": "Romosozumab",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Zoledronic acid",
          "type": "DRUG"
        },
        {
          "name": "Calcium and Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Susan L. Greenspan",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "65 Years and older · Female only"
      },
      "enrollment_count": 184,
      "start_date": "2021-09-15",
      "completion_date": "2027-03-31",
      "has_results": false,
      "last_update_posted_date": "2026-02-17",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05058976"
    },
    {
      "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": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03994172"
    },
    {
      "nct_id": "NCT03596073",
      "title": "Topical Calcipotriene Treatment for Breast Cancer Immunoprevention",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Topical Calcipotriene Ointment",
          "type": "DRUG"
        },
        {
          "name": "Topical Vaseline",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 43,
      "start_date": "2018-11-07",
      "completion_date": "2020-08-31",
      "has_results": false,
      "last_update_posted_date": "2025-05-07",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03596073"
    },
    {
      "nct_id": "NCT00996866",
      "title": "Vitamin D Supplementation Requirement in Obese Subjects",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Winthrop University Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 27,
      "start_date": "2008-12",
      "completion_date": "2013-08",
      "has_results": true,
      "last_update_posted_date": "2023-07-03",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "Mineola, New York",
      "locations": [
        {
          "city": "Mineola",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00996866"
    },
    {
      "nct_id": "NCT02064946",
      "title": "High-dose Vitamin D Supplementation for ADT-induced Side Effects",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Prostatic Neoplasms",
        "Bone Mineral Density Quantitative Trait Locus 3"
      ],
      "interventions": [
        {
          "name": "vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Rochester",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": "99 Years",
        "sex": "MALE",
        "summary": "60 Years to 99 Years · Male only"
      },
      "enrollment_count": 108,
      "start_date": "2014-03",
      "completion_date": "2016-11",
      "has_results": false,
      "last_update_posted_date": "2019-04-08",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "Rochester, New York",
      "locations": [
        {
          "city": "Rochester",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02064946"
    },
    {
      "nct_id": "NCT00985361",
      "title": "Effect of Vitamin D Supplementation on Hemoglobin A1c in Patients With Uncontrolled Type 2 Diabetes Mellitus",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Type 2 Diabetes Mellitus"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 2000 international units daily",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin C 500mg daily",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "ProMedica Health System",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "21 Years to 75 Years"
      },
      "enrollment_count": 37,
      "start_date": "2009-10",
      "completion_date": "2010-03",
      "has_results": false,
      "last_update_posted_date": "2010-05-06",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 3,
      "location_summary": "Sylvania, Ohio • Toledo, Ohio",
      "locations": [
        {
          "city": "Sylvania",
          "state": "Ohio"
        },
        {
          "city": "Toledo",
          "state": "Ohio"
        },
        {
          "city": "Toledo",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00985361"
    },
    {
      "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": "2026-09-14T06:34:08.632Z",
      "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": "NCT01855009",
      "title": "Study of Parental Ratings of Quality of Life and Body Composition in 5-19 Year Olds While Participating in the Good NEWS 4 Kids Program",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Quality of Life",
        "Body Mass Index"
      ],
      "interventions": [
        {
          "name": "MannaBears",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "AlgaeCal Calcium",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Calcium carbonate",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Integrative Health Technologies, Inc.",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "19 Years",
        "sex": "ALL",
        "summary": "5 Years to 19 Years"
      },
      "enrollment_count": 200,
      "start_date": "2013-05",
      "completion_date": "2014-03",
      "has_results": false,
      "last_update_posted_date": "2013-06-24",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "San Antonio, Texas",
      "locations": [
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01855009"
    },
    {
      "nct_id": "NCT05559112",
      "title": "Effects of Vitamin D-Enriched Mushrooms on Vitamin D Status and Immune Function and Inflammatory Status in Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D-enriched mushrooms",
          "type": "OTHER"
        },
        {
          "name": "Study Powder",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Purdue University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "69 Years",
        "sex": "ALL",
        "summary": "30 Years to 69 Years"
      },
      "enrollment_count": 36,
      "start_date": "2022-12-05",
      "completion_date": "2024-04-30",
      "has_results": false,
      "last_update_posted_date": "2024-07-10",
      "last_synced_at": "2026-09-14T06:34:08.632Z",
      "location_count": 1,
      "location_summary": "West Lafayette, Indiana",
      "locations": [
        {
          "city": "West Lafayette",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05559112"
    }
  ]
}