{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Oral+vitamin+D3&page=4",
    "query": {
      "intervention": "Oral vitamin D3",
      "page": 4
    },
    "page_size": 10
  },
  "pagination": {
    "page": 4,
    "page_size": 10,
    "total_count": 326,
    "total_pages": 33,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Oral+vitamin+D3&page=5&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Oral+vitamin+D3&page=3&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-07T02:23:34.220Z",
  "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": "NCT01163162",
      "title": "The Effect of Paricalcitol on Creatinine Filtration, Secretion and Glomerular Filtration Rate",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "Paricalcitol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Indiana University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 16,
      "start_date": "2010-08",
      "completion_date": "2011-06",
      "has_results": true,
      "last_update_posted_date": "2013-05-21",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Indianapolis, Indiana",
      "locations": [
        {
          "city": "Indianapolis",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01163162"
    },
    {
      "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": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Flint, Michigan",
      "locations": [
        {
          "city": "Flint",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01354262"
    },
    {
      "nct_id": "NCT02574286",
      "title": "Study of the Effect of Velaglucerase Alfa (VPRIV®) on Bone-related Pathology in Treatment-naïve Participants With Type 1 Gaucher Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Gaucher Disease"
      ],
      "interventions": [
        {
          "name": "Velaglucerase alfa",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Shire",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 21,
      "start_date": "2016-06-29",
      "completion_date": "2020-11-30",
      "has_results": true,
      "last_update_posted_date": "2022-02-01",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 8,
      "location_summary": "Beverly Hills, California • Los Angeles, California • Atlanta, Georgia + 5 more",
      "locations": [
        {
          "city": "Beverly Hills",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02574286"
    },
    {
      "nct_id": "NCT02758990",
      "title": "Interventional Testing of Gene-environment Interactions Via the Verifomics Mobile Application",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Obesity",
        "Rhinitis",
        "Rhinitis, Allergic",
        "Respiratory Sounds",
        "Dyspnea",
        "Headache",
        "Migraine Disorders",
        "Arthritis",
        "Arthralgia",
        "Anxiety",
        "Sleep Initiation and Maintenance Disorders",
        "Sleep Deprivation"
      ],
      "interventions": [
        {
          "name": "Vitamin A",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin B6",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin C",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Nicotinamide",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin E",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Broccoli",
          "type": "OTHER"
        },
        {
          "name": "Spinach",
          "type": "OTHER"
        },
        {
          "name": "Caffeine",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Coffee",
          "type": "OTHER"
        },
        {
          "name": "Axon Eyewear",
          "type": "DEVICE"
        },
        {
          "name": "Chocolate",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER",
        "DEVICE"
      ],
      "sponsor": "Verifomics LLC",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 16,
      "start_date": "2016-03",
      "completion_date": "2016-11-23",
      "has_results": false,
      "last_update_posted_date": "2017-10-02",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02758990"
    },
    {
      "nct_id": "NCT02686905",
      "title": "Vitamin Supplementation After Bariatric Surgery",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Complications of Bariatric Procedures",
        "Avitaminosis"
      ],
      "interventions": [
        {
          "name": "Chewable Multivitamin with Iron",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "PatchMD Vitamin D3/Calcium Patch",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "PatchMD Multivitamin Patch",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "PatchMD B12 Energy Plus Patch",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Chewable Calcium",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Quick Dissolve B12",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "California State Polytechnic University, Pomona",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 30,
      "start_date": "2016-01",
      "completion_date": "2017-06",
      "has_results": false,
      "last_update_posted_date": "2016-09-30",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Brea, California",
      "locations": [
        {
          "city": "Brea",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02686905"
    },
    {
      "nct_id": "NCT03401541",
      "title": "25-Hydroxyvitamin D Pharmacokinetic Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Fat Malabsorption"
      ],
      "interventions": [
        {
          "name": "Calcifediol",
          "type": "DRUG"
        },
        {
          "name": "Calciferol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Boston University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 16,
      "start_date": "2018-10-01",
      "completion_date": "2019-11-01",
      "has_results": false,
      "last_update_posted_date": "2020-06-04",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03401541"
    },
    {
      "nct_id": "NCT03552653",
      "title": "Bioequivalence Study on Vitamin D in Healthy Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Measure Absorption of Vitamin D in Blood"
      ],
      "interventions": [
        {
          "name": "Vitafusion Extra Strength Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Church & Dwight Company, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 31,
      "start_date": "2017-08-26",
      "completion_date": "2017-12-22",
      "has_results": false,
      "last_update_posted_date": "2018-06-12",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Princeton, New Jersey",
      "locations": [
        {
          "city": "Princeton",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03552653"
    },
    {
      "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": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03994172"
    },
    {
      "nct_id": "NCT01633177",
      "title": "Study of Vitamin D and Omega-3 Supplementation for Preventing Diabetes",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Type 2 Diabetes"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Omega-3 fatty acid (fish oil)",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D3 placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Fish oil placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 22220,
      "start_date": "2011-11",
      "completion_date": "2024-05-30",
      "has_results": true,
      "last_update_posted_date": "2026-04-03",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01633177"
    },
    {
      "nct_id": "NCT01578473",
      "title": "Testosterone Pellets Plus Vitamin D and E Versus Vitamin D and E Alone for the Treatment of Peyronie's Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Peyronie's Disease"
      ],
      "interventions": [
        {
          "name": "Vitamin D2",
          "type": "DRUG"
        },
        {
          "name": "Vitamin E",
          "type": "DRUG"
        },
        {
          "name": "Testosterone Pellets",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Men's Health Boston",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "MALE",
        "summary": "18 Years to 70 Years · Male only"
      },
      "enrollment_count": 75,
      "start_date": "2013-05-23",
      "completion_date": "2017-11-13",
      "has_results": false,
      "last_update_posted_date": "2018-03-29",
      "last_synced_at": "2026-10-07T02:23:34.220Z",
      "location_count": 1,
      "location_summary": "Chestnut Hill, Massachusetts",
      "locations": [
        {
          "city": "Chestnut Hill",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01578473"
    }
  ]
}