{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=quercetin%2Fplacebo",
    "query": {
      "intervention": "quercetin/placebo"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 27,
    "total_pages": 3,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=quercetin%2Fplacebo&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-22T05:17:17.430Z",
  "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": "NCT04514510",
      "title": "Fixed Dose Flavonoid Isoquercetin on Thrombo-Inflammatory Biomarkers in Subjects With Stable Sickle Cell Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Sickle Cell Disease"
      ],
      "interventions": [
        {
          "name": "Isoquercetin",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Heart, Lung, and Blood Institute (NHLBI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 46,
      "start_date": "2020-11-02",
      "completion_date": "2022-07-07",
      "has_results": true,
      "last_update_posted_date": "2024-01-02",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04514510"
    },
    {
      "nct_id": "NCT00913081",
      "title": "Advancing Niacin by Inhibiting Flushing (ANTI-FLUSH)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Flushing"
      ],
      "interventions": [
        {
          "name": "Quercetin",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Pennsylvania",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "21 Years to 75 Years"
      },
      "enrollment_count": 17,
      "start_date": "2009-02",
      "completion_date": "2009-12",
      "has_results": true,
      "last_update_posted_date": "2015-03-05",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 2,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00913081"
    },
    {
      "nct_id": "NCT01185067",
      "title": "Physiological Effects of Grape Seed Extract in Diastolic Heart Failure",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Diastolic Heart Failure",
        "Hypertensive Heart Disease",
        "Heart Failure With Preserved Ejection Fraction",
        "Hypertension",
        "Oxidative Stress"
      ],
      "interventions": [
        {
          "name": "grape seed extract (MegaNatural BP, Polyphenolics, Inc.)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Michigan",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2010-10",
      "completion_date": "2014-02-24",
      "has_results": false,
      "last_update_posted_date": "2017-06-06",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 1,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01185067"
    },
    {
      "nct_id": "NCT02874989",
      "title": "Targeting Pro-Inflammatory Cells in Idiopathic Pulmonary Fibrosis: a Human Trial",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Idiopathic Pulmonary Fibrosis (IPF)"
      ],
      "interventions": [
        {
          "name": "Dasatinib + Quercetin",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Wake Forest University Health Sciences",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 26,
      "start_date": "2016-12-16",
      "completion_date": "2019-06-03",
      "has_results": false,
      "last_update_posted_date": "2020-05-12",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 2,
      "location_summary": "Winston-Salem, North Carolina • San Antonio, Texas",
      "locations": [
        {
          "city": "Winston-Salem",
          "state": "North Carolina"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02874989"
    },
    {
      "nct_id": "NCT05371340",
      "title": "Quercetin's Effect on Bone Health and Inflammatory Markers",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Osteoporosis, Postmenopausal"
      ],
      "interventions": [
        {
          "name": "Quercetin (500 mg)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo (500 mg)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Kennesaw State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": "75 Years",
        "sex": "FEMALE",
        "summary": "45 Years to 75 Years · Female only"
      },
      "enrollment_count": 33,
      "start_date": "2019-08-27",
      "completion_date": "2020-04-27",
      "has_results": false,
      "last_update_posted_date": "2022-05-12",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 1,
      "location_summary": "Kennesaw, Georgia",
      "locations": [
        {
          "city": "Kennesaw",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05371340"
    },
    {
      "nct_id": "NCT01839344",
      "title": "Effects of Quercetin on Blood Sugar and Blood Vessel Function in Type 2 Diabetes.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Diabetes Mellitus, Type 2"
      ],
      "interventions": [
        {
          "name": "Quercetin",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Acarbose",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Bastyr University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 19,
      "start_date": "2013-05",
      "completion_date": "2015-03",
      "has_results": false,
      "last_update_posted_date": "2015-03-18",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 1,
      "location_summary": "Seattle, Washington",
      "locations": [
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01839344"
    },
    {
      "nct_id": "NCT06683534",
      "title": "Palmitic Acid and Human Microvascular Function",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Microvascular Dysfunction",
        "Microvasculature",
        "Cardiovascular Diseases",
        "Cardiovascular Diseases (CVD)",
        "Microvascular Health",
        "Obesity and Overweight"
      ],
      "interventions": [
        {
          "name": "Quercetin (dietary supplement)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Medical College of Wisconsin",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 40,
      "start_date": "2026-07",
      "completion_date": "2030-12",
      "has_results": false,
      "last_update_posted_date": "2026-04-29",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 1,
      "location_summary": "Wauwatosa, Wisconsin",
      "locations": [
        {
          "city": "Wauwatosa",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06683534"
    },
    {
      "nct_id": "NCT00065676",
      "title": "Investigating the Use of Quercetin on Glucose Absorption in Obesity, and Obesity With Type 2 Diabetes",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Obesity",
        "Diabetes"
      ],
      "interventions": [
        {
          "name": "Quercetin",
          "type": "OTHER"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 24,
      "start_date": "2010-04-30",
      "completion_date": "2021-08-06",
      "has_results": false,
      "last_update_posted_date": "2026-08-31",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00065676"
    },
    {
      "nct_id": "NCT06615752",
      "title": "Green Tea and Quercetin in Combination With Docetaxel Chemotherapy in Castration-resistant Prostate Cancer Patients",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Metastatic Castration-resistant Prostate Cancer (mCRPC)"
      ],
      "interventions": [
        {
          "name": "green tea and quercetin + docetaxel",
          "type": "DRUG"
        },
        {
          "name": "Placebo + docetaxel",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Charles Drew University of Medicine and Science",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 99,
      "start_date": "2026-10",
      "completion_date": "2029-02",
      "has_results": false,
      "last_update_posted_date": "2026-04-15",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06615752"
    },
    {
      "nct_id": "NCT07144293",
      "title": "Improving Physical Ability and Cellular Senescence Elimination in HIV",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "HIV",
        "Frailty",
        "Prefrail",
        "Aging Problems"
      ],
      "interventions": [
        {
          "name": "Dasatinib",
          "type": "DRUG"
        },
        {
          "name": "Quercetin",
          "type": "DRUG"
        },
        {
          "name": "Placebo - Dasatinib",
          "type": "OTHER"
        },
        {
          "name": "Placebo - Quercetin",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 82,
      "start_date": "2025-12-04",
      "completion_date": "2026-08-26",
      "has_results": false,
      "last_update_posted_date": "2026-09-15",
      "last_synced_at": "2026-09-22T05:17:17.430Z",
      "location_count": 24,
      "location_summary": "Los Angeles, California • San Diego, California • San Francisco, California + 18 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Torrance",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07144293"
    }
  ]
}