{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+A+supplementation&page=3",
    "query": {
      "intervention": "Vitamin A supplementation",
      "page": 3
    },
    "page_size": 10
  },
  "pagination": {
    "page": 3,
    "page_size": 10,
    "total_count": 298,
    "total_pages": 30,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+A+supplementation&page=4&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+A+supplementation&page=2&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-07T07:52:48.834Z",
  "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": "NCT05869812",
      "title": "Influence of β-hydroxy β-methyl Butyrate (HMB)Supplementation on Post-operative Muscle Mass and Function in Female Athletes",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Atrophy"
      ],
      "interventions": [
        {
          "name": "CaHMB (Dietary supplement, not Drug)",
          "type": "DRUG"
        },
        {
          "name": "CaLa",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Kansas Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 45 Years · Female only"
      },
      "enrollment_count": 30,
      "start_date": "2023-05-29",
      "completion_date": "2029-12",
      "has_results": false,
      "last_update_posted_date": "2026-03-02",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 1,
      "location_summary": "Overland Park, Kansas",
      "locations": [
        {
          "city": "Overland Park",
          "state": "Kansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05869812"
    },
    {
      "nct_id": "NCT05427279",
      "title": "Effects of Vitamin C Enriched Hydrolyzed Collagen, PrimaColl™, Whey Protein, or Placebo on Collagen Synthesis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Effect of Food Supplement"
      ],
      "interventions": [
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Hydrolized Collagen",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "PrimaColl",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Whey protein",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of California, Davis",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "30 Years",
        "sex": "ALL",
        "summary": "18 Years to 30 Years"
      },
      "enrollment_count": 20,
      "start_date": "2022-10-05",
      "completion_date": "2024-09-30",
      "has_results": false,
      "last_update_posted_date": "2026-05-08",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 1,
      "location_summary": "Davis, California",
      "locations": [
        {
          "city": "Davis",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05427279"
    },
    {
      "nct_id": "NCT07836712",
      "title": "Multiple Adjunct Therapies to Improve Immunotherapy Treatment in Patients With Locally Advanced or Metastatic Melanoma or Advanced Hepatocellular Cancer",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Advanced Hepatocellular Carcinoma",
        "Advanced Melanoma",
        "Locally Advanced Melanoma",
        "Metastatic Melanoma",
        "Stage III Hepatocellular Carcinoma AJCC v8",
        "Stage IV Hepatocellular Carcinoma AJCC v8"
      ],
      "interventions": [
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Desloratadine",
          "type": "DRUG"
        },
        {
          "name": "Immunotherapy",
          "type": "OTHER"
        },
        {
          "name": "Infusion Procedure",
          "type": "PROCEDURE"
        },
        {
          "name": "Magnesium Sulfate",
          "type": "DRUG"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Propranolol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DIETARY_SUPPLEMENT",
        "DRUG",
        "OTHER"
      ],
      "sponsor": "University of Southern California",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 46,
      "start_date": "2026-11-01",
      "completion_date": "2028-11-01",
      "has_results": false,
      "last_update_posted_date": "2026-09-23",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07836712"
    },
    {
      "nct_id": "NCT02172651",
      "title": "Vitamin D in Patients With Stage I-III Colon Cancer or Resectable Colon Cancer Liver Metastases",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Stage, Colon Cancer",
        "Stage I-III Colon Cancer",
        "Stage IV Colon Cancer With Resectable Liver Metastases"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Dana-Farber Cancer Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 80,
      "start_date": "2014-07-14",
      "completion_date": "2027-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-05-13",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02172651"
    },
    {
      "nct_id": "NCT00870961",
      "title": "Vitamin D Supplement in Preventing Colon Cancer in African Americans With Colon Polyps",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer",
        "Precancerous Condition"
      ],
      "interventions": [
        {
          "name": "cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 22,
      "start_date": "2009-02",
      "completion_date": "2012-06",
      "has_results": false,
      "last_update_posted_date": "2013-09-16",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 2,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00870961"
    },
    {
      "nct_id": "NCT04596657",
      "title": "Vitamin D3 Supplementation to Prevent Respiratory Tract Infections",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Respiratory Tract Infections",
        "Covid19",
        "Flu Like Illness"
      ],
      "interventions": [
        {
          "name": "Vitamin D supplementation",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "The Cooper Health System",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 877,
      "start_date": "2020-10-27",
      "completion_date": "2023-10-19",
      "has_results": false,
      "last_update_posted_date": "2023-12-08",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 1,
      "location_summary": "Camden, New Jersey",
      "locations": [
        {
          "city": "Camden",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04596657"
    },
    {
      "nct_id": "NCT01199926",
      "title": "Effect of Vitamin D Supplementation on Muscle Mass and Function",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Obesity",
        "Insulin Resistance",
        "Inflammation"
      ],
      "interventions": [
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Purdue University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "18 Years to 35 Years"
      },
      "enrollment_count": 34,
      "start_date": "2008-08",
      "completion_date": "2010-02",
      "has_results": true,
      "last_update_posted_date": "2015-05-15",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 1,
      "location_summary": "West Lafayette, Indiana",
      "locations": [
        {
          "city": "West Lafayette",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01199926"
    },
    {
      "nct_id": "NCT02137408",
      "title": "Docosahexaenoic Acid Supplementation of Women With Hypertension in Pregnancy to Improve Endothelial Health",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypertension in Pregnancy"
      ],
      "interventions": [
        {
          "name": "Docosahexaenoic acid 200 mg",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Docosahexaenoic acid 1000 mg",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Children's Hospital Medical Center, Cincinnati",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 45 Years · Female only"
      },
      "enrollment_count": 0,
      "start_date": "2014-12",
      "completion_date": "2016-04",
      "has_results": false,
      "last_update_posted_date": "2014-09-18",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02137408"
    },
    {
      "nct_id": "NCT03633708",
      "title": "A Trial of Etelcalcetide in Pediatric Participants With Secondary Hyperparathyroidism and Chronic Kidney Disease on Hemodialysis",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Secondary Hyperparathyroidism",
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "Etelcalcetide",
          "type": "DRUG"
        },
        {
          "name": "Standard of Care",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Amgen",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "0 Years",
        "maximum_age": "18 Years",
        "sex": "ALL",
        "summary": "0 Years to 18 Years"
      },
      "enrollment_count": 56,
      "start_date": "2019-04-29",
      "completion_date": "2029-01-31",
      "has_results": false,
      "last_update_posted_date": "2026-02-27",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 10,
      "location_summary": "Los Angeles, California • Aurora, Colorado • Kansas City, Missouri + 7 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Kansas City",
          "state": "Missouri"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03633708"
    },
    {
      "nct_id": "NCT00186901",
      "title": "A Severity-Adapted Clinical Trial of Diminished Bone Mineral Density in Acute Lymphoblastic Leukemia Survivors",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Leukemia, Lymphoblastic, Acute",
        "Osteoporosis"
      ],
      "interventions": [
        {
          "name": "Calcium carbonate (Tums), vitamin D",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "St. Jude Children's Research Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 429,
      "start_date": "2000-07",
      "completion_date": "2011-09",
      "has_results": true,
      "last_update_posted_date": "2017-05-10",
      "last_synced_at": "2026-10-07T07:52:48.834Z",
      "location_count": 3,
      "location_summary": "Memphis, Tennessee",
      "locations": [
        {
          "city": "Memphis",
          "state": "Tennessee"
        },
        {
          "city": "Memphis",
          "state": "Tennessee"
        },
        {
          "city": "Memphis",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00186901"
    }
  ]
}