{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=800+IU+Vitamin+D+Supplement",
    "query": {
      "intervention": "800 IU Vitamin D Supplement"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 18,
    "total_pages": 2,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=800+IU+Vitamin+D+Supplement&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-10-01T00:26:47.906Z",
  "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": "NCT02753283",
      "title": "Preventing Osteoporosis Using Denosumab",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Osteoporosis, Postmenopausal",
        "Osteoporosis",
        "Osteoporotic Fractures"
      ],
      "interventions": [
        {
          "name": "denosumab",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "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": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 201,
      "start_date": "2016-06",
      "completion_date": "2023-08",
      "has_results": true,
      "last_update_posted_date": "2024-09-19",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02753283"
    },
    {
      "nct_id": "NCT00558012",
      "title": "Zoledronic Acid for Osteoporosis in the Elderly",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Osteoporosis",
        "Bone Loss",
        "Fragility Fractures"
      ],
      "interventions": [
        {
          "name": "Intravenous zoledronic acid",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D 800 IU/daily",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Calcium 1200 mg/daily",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Pittsburgh",
      "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": 181,
      "start_date": "2007-12",
      "completion_date": "2014-02",
      "has_results": true,
      "last_update_posted_date": "2015-07-31",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00558012"
    },
    {
      "nct_id": "NCT01988090",
      "title": "High Dose Vitamin D vs Standard Dose Vitamin D Study",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "800 IU Vitamin D Supplement",
          "type": "DRUG"
        },
        {
          "name": "50,000 IU Vitamin D supplement",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Mothaffar Rimawi",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 93,
      "start_date": "2013-12",
      "completion_date": "2018-12-10",
      "has_results": true,
      "last_update_posted_date": "2021-08-09",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 2,
      "location_summary": "St Louis, Missouri • Houston, Texas",
      "locations": [
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01988090"
    },
    {
      "nct_id": "NCT03408119",
      "title": "Dried Plums Prevent Inflammation And Improve Bone Health in Osteopenic Men",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Osteoporosis, Osteopenia"
      ],
      "interventions": [
        {
          "name": "Dried Plum",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "800 IU vitamin D and 450mg elemental calcium",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Florida State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "80 Years",
        "sex": "MALE",
        "summary": "50 Years to 80 Years · Male only"
      },
      "enrollment_count": 62,
      "start_date": "2017-11-20",
      "completion_date": "2022-08-30",
      "has_results": false,
      "last_update_posted_date": "2022-10-07",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Tallahassee, Florida",
      "locations": [
        {
          "city": "Tallahassee",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03408119"
    },
    {
      "nct_id": "NCT02293187",
      "title": "Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Sarcopenia"
      ],
      "interventions": [
        {
          "name": "vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Tufts University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "60 Years to 85 Years"
      },
      "enrollment_count": 100,
      "start_date": "2015-03-23",
      "completion_date": "2018-12-31",
      "has_results": false,
      "last_update_posted_date": "2019-03-21",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02293187"
    },
    {
      "nct_id": "NCT01469650",
      "title": "Serum 25-hydroxy Vitamin D [25(OH)D] Levels, Supplemental Vitamin D, and Parathyroid Hormone Levels in Premature Infants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Premature Infants"
      ],
      "interventions": [
        {
          "name": "cholecalciferal",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Nebraska",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "23 Weeks",
        "maximum_age": "32 Weeks",
        "sex": "ALL",
        "summary": "23 Weeks to 32 Weeks"
      },
      "enrollment_count": 32,
      "start_date": "2012-01",
      "completion_date": "2013-07",
      "has_results": false,
      "last_update_posted_date": "2023-09-06",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01469650"
    },
    {
      "nct_id": "NCT01827345",
      "title": "Vitamin D as a Supplement Against Falls in Elderly Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency (10 ng/mL to 30 ng/mL)"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Florida",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "70 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "70 Years and older"
      },
      "enrollment_count": 25,
      "start_date": "2013-04",
      "completion_date": "2016-12",
      "has_results": false,
      "last_update_posted_date": "2016-12-26",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Gainesville, Florida",
      "locations": [
        {
          "city": "Gainesville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01827345"
    },
    {
      "nct_id": "NCT05694689",
      "title": "Randomized Trial of Enteral Vitamin D Supplementation in Infants < 28 Weeks Gestational Age or <1000 Grams Birth Weight",
      "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": 60,
      "start_date": "2023-02-15",
      "completion_date": "2029-06-01",
      "has_results": false,
      "last_update_posted_date": "2026-06-11",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Galveston, Texas",
      "locations": [
        {
          "city": "Galveston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05694689"
    },
    {
      "nct_id": "NCT00494104",
      "title": "Prevention of Vitamin D Deficiency",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D drops, 200 or 400 or 600 IU/day or 800 IU/day",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "3 Weeks",
        "maximum_age": "5 Weeks",
        "sex": "ALL",
        "summary": "3 Weeks to 5 Weeks"
      },
      "enrollment_count": 398,
      "start_date": "2006-09",
      "completion_date": "2011-09",
      "has_results": false,
      "last_update_posted_date": "2012-12-18",
      "last_synced_at": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Coralville, Iowa",
      "locations": [
        {
          "city": "Coralville",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00494104"
    },
    {
      "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": "2026-10-01T00:26:47.906Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05459298"
    }
  ]
}