{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+supplementation",
    "query": {
      "intervention": "Vitamin D supplementation"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 276,
    "total_pages": 28,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+supplementation&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-22T04:25:52.817Z",
  "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": "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": "2026-09-22T04:25:52.817Z",
      "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": "NCT01759771",
      "title": "Vitamin D3 Supplementation for Low-Risk Prostate Cancer: A Randomized Trial",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": "90 Years",
        "sex": "MALE",
        "summary": "19 Years to 90 Years · Male only"
      },
      "enrollment_count": 130,
      "start_date": "2013-01-03",
      "completion_date": "2020-05-11",
      "has_results": true,
      "last_update_posted_date": "2024-03-18",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 2,
      "location_summary": "Charleston, South Carolina",
      "locations": [
        {
          "city": "Charleston",
          "state": "South Carolina"
        },
        {
          "city": "Charleston",
          "state": "South Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01759771"
    },
    {
      "nct_id": "NCT00204906",
      "title": "Correction of Vitamin D Inadequacy in Nursing Home Residents",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypovitaminosis D"
      ],
      "interventions": [
        {
          "name": "vitamin D supplementation",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": null,
      "start_date": "2005-01",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2015-10-05",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 1,
      "location_summary": "Madison, Wisconsin",
      "locations": [
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00204906"
    },
    {
      "nct_id": "NCT00587158",
      "title": "Oral Paricalcitol in Kidney Transplant Recipients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Transplant; Failure, Kidney",
        "Renal Disease, End Stage",
        "Hyperparathyroidism, Secondary"
      ],
      "interventions": [
        {
          "name": "Paricalcitol",
          "type": "DRUG"
        },
        {
          "name": "Corticosteroid Avoidance Immune Suppression Protocol",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "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": 100,
      "start_date": "2007-01",
      "completion_date": "2011-11",
      "has_results": true,
      "last_update_posted_date": "2013-05-13",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 2,
      "location_summary": "Scottsdale, Arizona • Rochester, Minnesota",
      "locations": [
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00587158"
    },
    {
      "nct_id": "NCT00499408",
      "title": "Vitamin D and Soy Supplements in Treating Patients With Recurrent Prostate Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "soy",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Wake Forest University Health Sciences",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "120 Years",
        "sex": "MALE",
        "summary": "18 Years to 120 Years · Male only"
      },
      "enrollment_count": 26,
      "start_date": "2007-04",
      "completion_date": "2012-12",
      "has_results": true,
      "last_update_posted_date": "2018-11-21",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 1,
      "location_summary": "Winston-Salem, North Carolina",
      "locations": [
        {
          "city": "Winston-Salem",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00499408"
    },
    {
      "nct_id": "NCT03686150",
      "title": "Vitamin D Oral Replacement in Asthma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Asthma",
        "Vitamin D Deficiency",
        "Pediatric Obesity"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 oral regimen",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "IDeA States Pediatric Clinical Trials Network",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "6 Years to 17 Years"
      },
      "enrollment_count": 112,
      "start_date": "2019-01-30",
      "completion_date": "2021-09-30",
      "has_results": true,
      "last_update_posted_date": "2023-04-19",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 15,
      "location_summary": "Little Rock, Arkansas • Wilmington, Delaware • Honolulu, Hawaii + 12 more",
      "locations": [
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Wilmington",
          "state": "Delaware"
        },
        {
          "city": "Honolulu",
          "state": "Hawaii"
        },
        {
          "city": "Louisville",
          "state": "Kentucky"
        },
        {
          "city": "Baton Rouge",
          "state": "Louisiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03686150"
    },
    {
      "nct_id": "NCT00476346",
      "title": "Calcium and Vitamin D Supplementation Decreases Incidence of Stress Fractures in Female Navy Recruits",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Stress Fracture"
      ],
      "interventions": [
        {
          "name": "Calcium & Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Creighton University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 5201,
      "start_date": "2002-05",
      "completion_date": "2006-03",
      "has_results": false,
      "last_update_posted_date": "2015-03-25",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00476346"
    },
    {
      "nct_id": "NCT00876928",
      "title": "Vitamin D in Minorities With Prediabetes",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Pre-diabetes"
      ],
      "interventions": [
        {
          "name": "vitamin D",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Charles Drew University of Medicine and Science",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "18 Years to 90 Years"
      },
      "enrollment_count": 117,
      "start_date": "2009-03",
      "completion_date": "2012-06",
      "has_results": true,
      "last_update_posted_date": "2013-06-14",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00876928"
    },
    {
      "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": "2026-09-22T04:25:52.817Z",
      "location_count": 1,
      "location_summary": "Rochester, New York",
      "locations": [
        {
          "city": "Rochester",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02064946"
    },
    {
      "nct_id": "NCT01847027",
      "title": "Exercise and NutraStem (NT-020): Effects on Stem Cells",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Adult Stem Cell Proliferation"
      ],
      "interventions": [
        {
          "name": "NutraStem",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of North Texas Health Science Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "50 Years to 70 Years"
      },
      "enrollment_count": 23,
      "start_date": "2013-04",
      "completion_date": "2017-07-17",
      "has_results": true,
      "last_update_posted_date": "2019-05-29",
      "last_synced_at": "2026-09-22T04:25:52.817Z",
      "location_count": 1,
      "location_summary": "Fort Worth, Texas",
      "locations": [
        {
          "city": "Fort Worth",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01847027"
    }
  ]
}