{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Supplemental+Vitamin+D",
    "query": {
      "intervention": "Supplemental Vitamin D"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 180,
    "total_pages": 18,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Supplemental+Vitamin+D&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-26T22:26:26.011Z",
  "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": "NCT01141972",
      "title": "The Role of Vitamin D in Menopause: Relationship to Menopausal Symptoms in Body Composition",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Hot Flushes",
        "Menopause, Premature",
        "Obesity",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Kaiser Permanente",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "60 Years",
        "sex": "FEMALE",
        "summary": "40 Years to 60 Years · Female only"
      },
      "enrollment_count": 23,
      "start_date": "2010-09",
      "completion_date": "2012-02",
      "has_results": false,
      "last_update_posted_date": "2013-05-30",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01141972"
    },
    {
      "nct_id": "NCT02626299",
      "title": "Assessment of DHA On Reducing Early Preterm Birth",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Preterm Birth"
      ],
      "interventions": [
        {
          "name": "Docosahexaenoic acid - 800mg/day",
          "type": "DRUG"
        },
        {
          "name": "Docosahexaenoic acid - 200mg/day",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "University of Kansas Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 1100,
      "start_date": "2016-06-08",
      "completion_date": "2020-10-05",
      "has_results": false,
      "last_update_posted_date": "2021-03-30",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 3,
      "location_summary": "Kansas City, Kansas • Cincinnati, Ohio • Columbus, Ohio",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Kansas"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        },
        {
          "city": "Columbus",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02626299"
    },
    {
      "nct_id": "NCT02375503",
      "title": "Efficacy of a Once Daily Calcium and Vitamin D Fortified Food Product to Improve Bone Microarchitecture",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Bone Alteration",
        "Dietary Modification"
      ],
      "interventions": [
        {
          "name": "Calcium/Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "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": 175,
      "start_date": "2015-04",
      "completion_date": "2015-06",
      "has_results": false,
      "last_update_posted_date": "2017-05-15",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Columbia, South Carolina",
      "locations": [
        {
          "city": "Columbia",
          "state": "South Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02375503"
    },
    {
      "nct_id": "NCT05862519",
      "title": "A Clinical Study to Evaluate the Efficacy of Four Supplements on Improving Readiness for Intimacy",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Libido",
        "Intimacy",
        "Gastrointestinal Issues"
      ],
      "interventions": [
        {
          "name": "Reset",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Stay Ready Fiber",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Libido",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Testosterone supplement",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "906 CMVI Holdings",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "44 Years",
        "sex": "MALE",
        "summary": "18 Years to 44 Years · Male only"
      },
      "enrollment_count": 36,
      "start_date": "2023-03-14",
      "completion_date": "2023-06-13",
      "has_results": false,
      "last_update_posted_date": "2023-05-17",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Santa Monica, California",
      "locations": [
        {
          "city": "Santa Monica",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05862519"
    },
    {
      "nct_id": "NCT04386577",
      "title": "Effects of Vitamin D and Omega-3 Supplementation on Telomeres in VITAL",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Aging"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 (cholecalciferol)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "fish oil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Augusta University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 1054,
      "start_date": "2016-08-19",
      "completion_date": "2021-04-30",
      "has_results": false,
      "last_update_posted_date": "2020-05-13",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Augusta, Georgia",
      "locations": [
        {
          "city": "Augusta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04386577"
    },
    {
      "nct_id": "NCT06522672",
      "title": "A Study to Assess the Effect of My Happy Flo on Alleviating Period Symptoms and Heavy Flows.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Menstrual Cramps",
        "Women's Health",
        "Fatigue"
      ],
      "interventions": [
        {
          "name": "My Happy Flo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "My Happy Flo",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 40,
      "start_date": "2024-05-31",
      "completion_date": "2024-08-31",
      "has_results": false,
      "last_update_posted_date": "2024-11-20",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Santa Monica, California",
      "locations": [
        {
          "city": "Santa Monica",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06522672"
    },
    {
      "nct_id": "NCT05522179",
      "title": "Nutritional Supplements and Foot Surgery",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Foot Injuries and Disorders"
      ],
      "interventions": [
        {
          "name": "NutraHeal",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "NutraHeal Plus",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "NutraHeal",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "20 Years to 80 Years"
      },
      "enrollment_count": 46,
      "start_date": "2022-08-29",
      "completion_date": "2023-07-30",
      "has_results": false,
      "last_update_posted_date": "2023-08-01",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 3,
      "location_summary": "Altoona, Pennsylvania • Ebensburg, Pennsylvania • State College, Pennsylvania",
      "locations": [
        {
          "city": "Altoona",
          "state": "Pennsylvania"
        },
        {
          "city": "Ebensburg",
          "state": "Pennsylvania"
        },
        {
          "city": "State College",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05522179"
    },
    {
      "nct_id": "NCT06158932",
      "title": "A Single Group Study to Evaluate the Effects of a Myo-Inositol and D-Chiro Inositol Supplement on Symptoms Associated With Polycystic Ovary Syndrome and Hormone Imbalance",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Polycystic Ovary Syndrome",
        "Hormone Imbalance"
      ],
      "interventions": [
        {
          "name": "Optify Myo Inositol and D-Chiro Inositol Plus Folate and Vitamin D supplement",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Optify",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 55 Years · Female only"
      },
      "enrollment_count": 40,
      "start_date": "2023-09-08",
      "completion_date": "2024-01-06",
      "has_results": false,
      "last_update_posted_date": "2024-04-03",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Santa Monica, California",
      "locations": [
        {
          "city": "Santa Monica",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06158932"
    },
    {
      "nct_id": "NCT00572104",
      "title": "Efficacy of Plyometrics to Increase Bone Mass in Men With Osteopenia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Osteopenia"
      ],
      "interventions": [
        {
          "name": "resistance exercise",
          "type": "OTHER"
        },
        {
          "name": "plyometric exercise",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Missouri-Columbia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "25 Years",
        "maximum_age": "60 Years",
        "sex": "MALE",
        "summary": "25 Years to 60 Years · Male only"
      },
      "enrollment_count": 38,
      "start_date": "2008-01",
      "completion_date": "2013-11",
      "has_results": false,
      "last_update_posted_date": "2016-10-07",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Columbia, Missouri",
      "locations": [
        {
          "city": "Columbia",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00572104"
    },
    {
      "nct_id": "NCT02212652",
      "title": "Vitamin D to Improve Nutrition Prior to Bariatric Surgery and Investigate the Relationship With Negative Outcomes",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Vitamin D Insufficiency"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        },
        {
          "name": "Standard of Care",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Johns Hopkins University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "18 Years to 64 Years"
      },
      "enrollment_count": 70,
      "start_date": "2017-01",
      "completion_date": "2017-04",
      "has_results": false,
      "last_update_posted_date": "2019-06-06",
      "last_synced_at": "2026-09-26T22:26:26.011Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02212652"
    }
  ]
}