{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Vitamin+A+Deficiency&page=2",
    "query": {
      "condition": "Vitamin A Deficiency",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Vitamin+A+Deficiency&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-05-22T09:46:05.909Z",
  "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": "NCT03471481",
      "title": "Magnesium as a Mediator of Bone and Vitamin D Metabolism in Patients on Antiepileptic Drug Therapy",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Epilepsy",
        "Magnesium Deficiency",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "No Intervention. Study is Cross Sectional in nature",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Drexel University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 7,
      "start_date": "2015-08-10",
      "completion_date": "2019-08-01",
      "has_results": false,
      "last_update_posted_date": "2021-03-01",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 2,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03471481"
    },
    {
      "nct_id": "NCT05543928",
      "title": "Phase 3 Safety and Efficacy Study of CTAP101 Extended-release Capsules in Children With Secondary Hyperparathyroidism",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Chronic Kidney Disease stage3",
        "Chronic Kidney Disease stage4",
        "Vitamin d Deficiency",
        "Secondary Hyperparathyroidism"
      ],
      "interventions": [
        {
          "name": "CTAP101",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "OPKO Health, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "8 Years to 17 Years"
      },
      "enrollment_count": 2,
      "start_date": "2023-01-31",
      "completion_date": "2024-06-19",
      "has_results": true,
      "last_update_posted_date": "2025-07-25",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 2,
      "location_summary": "Columbus, Ohio • Greenville, South Carolina",
      "locations": [
        {
          "city": "Columbus",
          "state": "Ohio"
        },
        {
          "city": "Greenville",
          "state": "South Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05543928"
    },
    {
      "nct_id": "NCT02477956",
      "title": "Effect of a Monthly High Dose of Vitamin D3 on Bariatric Surgery Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Morbid Obesity",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "vitamin D3 (Replesta)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Texas Tech University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 31,
      "start_date": "2012-11",
      "completion_date": "2013-12",
      "has_results": false,
      "last_update_posted_date": "2015-06-23",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 1,
      "location_summary": "Lubbock, Texas",
      "locations": [
        {
          "city": "Lubbock",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02477956"
    },
    {
      "nct_id": "NCT01163149",
      "title": "Safety and Efficacy Study of Asfotase Alfa in Adolescents and Adults With Hypophosphatasia (HPP)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Hypophosphatasia"
      ],
      "interventions": [
        {
          "name": "asfotase alfa",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Alexion Pharmaceuticals, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "13 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "13 Years to 65 Years"
      },
      "enrollment_count": 19,
      "start_date": "2010-06",
      "completion_date": "2016-06",
      "has_results": true,
      "last_update_posted_date": "2019-03-13",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 2,
      "location_summary": "St Louis, Missouri • Durham, North Carolina",
      "locations": [
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01163149"
    },
    {
      "nct_id": "NCT05453708",
      "title": "Maternal Risk Factors for Autism Spectrum Disorders: A Case-Control Approach",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Autism",
        "Autism Spectrum Disorder",
        "Autistic Disorder",
        "Pregnancy Related",
        "Diet, Healthy",
        "Diet; Deficiency",
        "Folate Deficiency",
        "Folic Acid Deficiency",
        "Folic Acid Overdose"
      ],
      "interventions": [
        {
          "name": "Survey",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Walden University",
      "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": 239,
      "start_date": "2022-06-16",
      "completion_date": "2023-01-22",
      "has_results": false,
      "last_update_posted_date": "2023-03-20",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 1,
      "location_summary": "Minneapolis, Minnesota",
      "locations": [
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05453708"
    },
    {
      "nct_id": "NCT01274013",
      "title": "Vitamin D Deficiency in Subjects With Chronic Hepatitis C Compared to Healthy Volunteers",
      "overall_status": "WITHDRAWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Chronic Hepatitis C"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Avera McKennan Hospital & University Health Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "20 Years to 60 Years"
      },
      "enrollment_count": 0,
      "start_date": "2009-10",
      "completion_date": "2019-01",
      "has_results": false,
      "last_update_posted_date": "2019-01-10",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 1,
      "location_summary": "Sioux Falls, South Dakota",
      "locations": [
        {
          "city": "Sioux Falls",
          "state": "South Dakota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01274013"
    },
    {
      "nct_id": "NCT02435940",
      "title": "Inherited Retinal Degenerative Disease Registry",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Eye Diseases Hereditary",
        "Retinal Disease",
        "Achromatopsia",
        "Bardet-Biedl Syndrome",
        "Bassen-Kornzweig Syndrome",
        "Batten Disease",
        "Best Disease",
        "Choroidal Dystrophy",
        "Choroideremia",
        "Cone Dystrophy",
        "Cone-Rod Dystrophy",
        "Congenital Stationary Night Blindness",
        "Enhanced S-Cone Syndrome",
        "Fundus Albipunctatus",
        "Goldmann-Favre Syndrome",
        "Gyrate Atrophy",
        "Juvenile Macular Degeneration",
        "Kearns-Sayre Syndrome",
        "Leber Congenital Amaurosis",
        "Refsum Syndrome",
        "Retinitis Pigmentosa",
        "Retinitis Punctata Albescens",
        "Retinoschisis",
        "Rod-Cone Dystrophy",
        "Rod Dystrophy",
        "Rod Monochromacy",
        "Stargardt Disease",
        "Usher Syndrome"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Foundation Fighting Blindness",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 20000,
      "start_date": "2014-06",
      "completion_date": "2037-06",
      "has_results": false,
      "last_update_posted_date": "2026-05-19",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 1,
      "location_summary": "Columbia, Maryland",
      "locations": [
        {
          "city": "Columbia",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02435940"
    },
    {
      "nct_id": "NCT02526160",
      "title": "Study of KRN23 in Adults With X-linked Hypophosphatemia (XLH)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "X-linked Hypophosphatemia"
      ],
      "interventions": [
        {
          "name": "burosumab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "Kyowa Kirin, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 134,
      "start_date": "2015-10-22",
      "completion_date": "2018-12-06",
      "has_results": true,
      "last_update_posted_date": "2024-06-18",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 8,
      "location_summary": "Los Angeles, California • San Francisco, California • New Haven, Connecticut + 5 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02526160"
    },
    {
      "nct_id": "NCT05011370",
      "title": "Prevalence of Liver Disease in Patients Dependent on Parenteral Nutrition",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Intestinal Failure-associated Liver Disease"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Protara Therapeutics",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "12 Years to 80 Years"
      },
      "enrollment_count": 80,
      "start_date": "2021-08-23",
      "completion_date": "2023-06-29",
      "has_results": false,
      "last_update_posted_date": "2023-10-03",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 10,
      "location_summary": "Los Angeles, California • Kissimmee, Florida • Chicago, Illinois + 7 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Kissimmee",
          "state": "Florida"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05011370"
    },
    {
      "nct_id": "NCT01475617",
      "title": "Efficacy of a Novel Multivitamin-Mineral Supplement in Preventing Vitamin Deficiency in Postoperative Bariatric Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Bariatric Surgery Candidate"
      ],
      "interventions": [
        {
          "name": "AquaVanta Chewable Tablet",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Flinstones Complete",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Nature Made Calcium Softgels",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Twin Labs Iron Caps",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Rexall Vitamin B12 Tablet",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Yasoo Health",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 61,
      "start_date": "2011-11",
      "completion_date": "2014-06",
      "has_results": false,
      "last_update_posted_date": "2015-01-22",
      "last_synced_at": "2026-05-22T09:46:05.909Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01475617"
    }
  ]
}