{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=%22Echinacea+purpurea%22+placebo",
    "query": {
      "intervention": "\"Echinacea purpurea\" placebo"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 6,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-10-07T20:27:04.739Z",
  "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": "NCT02134119",
      "title": "Echinacea-based Supplement Does Not Improve Markers of Performance in Athletes",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Ineffective Erythropoiesis"
      ],
      "interventions": [
        {
          "name": "Echinacea-based dietary supplement",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "University of Georgia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "44 Years",
        "sex": "ALL",
        "summary": "18 Years to 44 Years"
      },
      "enrollment_count": 45,
      "start_date": "2012-01",
      "completion_date": "2013-07",
      "has_results": true,
      "last_update_posted_date": "2017-01-05",
      "last_synced_at": "2026-10-07T20:27:04.739Z",
      "location_count": 1,
      "location_summary": "Lubbock, Texas",
      "locations": [
        {
          "city": "Lubbock",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02134119"
    },
    {
      "nct_id": "NCT00689468",
      "title": "Echinacea Purpurea and Osteopathy in Children With Recurrent Otitis Media",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Otitis Media"
      ],
      "interventions": [
        {
          "name": "Cranial osteopathic manipulative treatment.",
          "type": "PROCEDURE"
        },
        {
          "name": "Echinacea purpurea",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Sham osteopathic manipulative treatment",
          "type": "PROCEDURE"
        },
        {
          "name": "\"Echinacea purpurea\" placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Arizona",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "12 Months",
        "maximum_age": "60 Months",
        "sex": "ALL",
        "summary": "12 Months to 60 Months"
      },
      "enrollment_count": 90,
      "start_date": "1999-07",
      "completion_date": "2002-10",
      "has_results": false,
      "last_update_posted_date": "2008-06-03",
      "last_synced_at": "2026-10-07T20:27:04.739Z",
      "location_count": 3,
      "location_summary": "Tucson, Arizona",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00689468"
    },
    {
      "nct_id": "NCT00860795",
      "title": "Immunologic Effects of Echinacea",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Upper Respiratory Tract Infections"
      ],
      "interventions": [
        {
          "name": "Echinacea purpurea",
          "type": "BIOLOGICAL"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "DRUG"
      ],
      "sponsor": "University of Washington",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "21 Years to 65 Years"
      },
      "enrollment_count": 20,
      "start_date": "2009-03",
      "completion_date": "2009-08",
      "has_results": true,
      "last_update_posted_date": "2018-05-01",
      "last_synced_at": "2026-10-07T20:27:04.739Z",
      "location_count": 1,
      "location_summary": "Kenmore, Washington",
      "locations": [
        {
          "city": "Kenmore",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00860795"
    },
    {
      "nct_id": "NCT01129128",
      "title": "Three Arm Trial of Immune Effects of Echinacea",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Upper Respiratory Tract Infections"
      ],
      "interventions": [
        {
          "name": "Echinacea purpurea product",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "University of Washington",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "21 Years to 65 Years"
      },
      "enrollment_count": 67,
      "start_date": "2010-05",
      "completion_date": "2011-03",
      "has_results": true,
      "last_update_posted_date": "2012-06-21",
      "last_synced_at": "2026-10-07T20:27:04.739Z",
      "location_count": 1,
      "location_summary": "Kenmore, Washington",
      "locations": [
        {
          "city": "Kenmore",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01129128"
    },
    {
      "nct_id": "NCT00065715",
      "title": "Echinacea Versus Placebo Effect in Common Cold (Physician Echinacea Placebo)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Common Cold"
      ],
      "interventions": [
        {
          "name": "Echinacea",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Blinded placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 719,
      "start_date": "2003-09",
      "completion_date": "2013-04",
      "has_results": false,
      "last_update_posted_date": "2014-12-04",
      "last_synced_at": "2026-10-07T20:27:04.739Z",
      "location_count": 1,
      "location_summary": "Madison, Wisconsin",
      "locations": [
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00065715"
    },
    {
      "nct_id": "NCT02003651",
      "title": "Echinacea and Acute Respiratory Illness",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Acute Respiratory Infections"
      ],
      "interventions": [
        {
          "name": "Quick Defense",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Appalachian State University",
      "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": "2013-11",
      "completion_date": "2014-08",
      "has_results": false,
      "last_update_posted_date": "2016-12-13",
      "last_synced_at": "2026-10-07T20:27:04.739Z",
      "location_count": 1,
      "location_summary": "Kannapolis, North Carolina",
      "locations": [
        {
          "city": "Kannapolis",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02003651"
    }
  ]
}