{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Menstrual+Cycle+Timing",
    "query": {
      "intervention": "Menstrual Cycle Timing"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 11,
    "total_pages": 2,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Menstrual+Cycle+Timing&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-03T19:16:38.354Z",
  "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": "NCT02520505",
      "title": "SO+IUI After Operative Laparoscopy in Patients With Advanced Stage Endometriosis",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Endometriosis",
        "Infertility"
      ],
      "interventions": [
        {
          "name": "Supraovulation clomiphene citrate",
          "type": "DRUG"
        },
        {
          "name": "Timed intercourse",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Intrauterine Insemination",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "BEHAVIORAL",
        "PROCEDURE"
      ],
      "sponsor": "The Cleveland Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 35 Years · Female only"
      },
      "enrollment_count": 0,
      "start_date": "2015-04",
      "completion_date": "2017-12",
      "has_results": false,
      "last_update_posted_date": "2018-01-24",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 1,
      "location_summary": "Cleveland, Ohio",
      "locations": [
        {
          "city": "Cleveland",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02520505"
    },
    {
      "nct_id": "NCT00005079",
      "title": "Timing of Menstrual Cycle and Surgery in Treating Premenopausal Women With Stage I, Stage II, or Stage III Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "conventional surgery",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Jonsson Comprehensive Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": null,
      "start_date": "1999-01",
      "completion_date": "2004-10",
      "has_results": false,
      "last_update_posted_date": "2013-05-15",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 2,
      "location_summary": "La Jolla, California • Los Angeles, California",
      "locations": [
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00005079"
    },
    {
      "nct_id": "NCT06471582",
      "title": "Timing of Energy Availability on Menstrual Cycle Function",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Menstrual Irregularity"
      ],
      "interventions": [
        {
          "name": "Artificially Sweetened Carbohydrate Beverage",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Artificially Sweetened Beverage",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Colorado, Colorado Springs",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 40 Years · Female only"
      },
      "enrollment_count": 64,
      "start_date": "2024-08-01",
      "completion_date": "2027-08-31",
      "has_results": false,
      "last_update_posted_date": "2026-05-01",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 1,
      "location_summary": "Colorado Springs, Colorado",
      "locations": [
        {
          "city": "Colorado Springs",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06471582"
    },
    {
      "nct_id": "NCT03074903",
      "title": "Does Skyla Insertion Timing Impact Bleeding?",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Vaginal Bleeding"
      ],
      "interventions": [
        {
          "name": "Intrauterine system",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Rutgers, The State University of New Jersey",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 45 Years · Female only"
      },
      "enrollment_count": 132,
      "start_date": "2016-04-16",
      "completion_date": "2017-07-28",
      "has_results": false,
      "last_update_posted_date": "2018-02-13",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 3,
      "location_summary": "Morristown, New Jersey • Newark, New Jersey",
      "locations": [
        {
          "city": "Morristown",
          "state": "New Jersey"
        },
        {
          "city": "Newark",
          "state": "New Jersey"
        },
        {
          "city": "Newark",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03074903"
    },
    {
      "nct_id": "NCT05610527",
      "title": "Hormonal Influences on Inflammatory Bowel Diseases",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Inflammatory Bowel Diseases",
        "Contraception",
        "Menstrual Problem"
      ],
      "interventions": [
        {
          "name": "Proposed study design and randomization scenarios",
          "type": "OTHER"
        },
        {
          "name": "Repeated measures of validated Inflammatory Bowel Disease Patient Reported Outcome Instruments",
          "type": "OTHER"
        },
        {
          "name": "Inflammatory marker collection and assessment for correlation with PRO responses and menstrual timing",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Utah",
      "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": 50,
      "start_date": "2025-07-01",
      "completion_date": "2025-12-09",
      "has_results": false,
      "last_update_posted_date": "2026-04-17",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 1,
      "location_summary": "Salt Lake City, Utah",
      "locations": [
        {
          "city": "Salt Lake City",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05610527"
    },
    {
      "nct_id": "NCT00456222",
      "title": "Impact of Sleep Disruption on the Menstrual Cycle",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Sleep",
        "Circadian Rhythm",
        "Menstrual Cycle"
      ],
      "interventions": [
        {
          "name": "Disrupting or changing the timing or the duration of sleep",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "30 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 30 Years · Female only"
      },
      "enrollment_count": 18,
      "start_date": "2003-06",
      "completion_date": "2009-08",
      "has_results": false,
      "last_update_posted_date": "2009-08-21",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 2,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00456222"
    },
    {
      "nct_id": "NCT05381532",
      "title": "Menstrual-phase-dependent Differences in Response to Sleep Loss",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Sleep Deprivation"
      ],
      "interventions": [
        {
          "name": "Controlled sleep",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 35 Years · Female only"
      },
      "enrollment_count": 29,
      "start_date": "2022-10-17",
      "completion_date": "2026-03-31",
      "has_results": false,
      "last_update_posted_date": "2026-07-02",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05381532"
    },
    {
      "nct_id": "NCT00353171",
      "title": "Organochlorine Exposure in Relation to Timing of Natural Menopause",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Menopause"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "National Institute of Environmental Health Sciences (NIEHS)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 514,
      "start_date": "2003-03-01",
      "completion_date": "2019-05-29",
      "has_results": false,
      "last_update_posted_date": "2019-06-17",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 1,
      "location_summary": "Research Triangle Park, North Carolina",
      "locations": [
        {
          "city": "Research Triangle Park",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00353171"
    },
    {
      "nct_id": "NCT03908320",
      "title": "Menstrual Phase and Smoking Cessation at a State Quitline",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Menstrual Cycle"
      ],
      "interventions": [
        {
          "name": "Menstrual Cycle Timing",
          "type": "OTHER"
        },
        {
          "name": "NRT Patch",
          "type": "DRUG"
        },
        {
          "name": "Cessation Counseling",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DRUG",
        "BEHAVIORAL"
      ],
      "sponsor": "University of Arizona",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 40 Years · Female only"
      },
      "enrollment_count": 119,
      "start_date": "2019-01-15",
      "completion_date": "2020-09-30",
      "has_results": false,
      "last_update_posted_date": "2020-10-19",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 1,
      "location_summary": "Tucson, Arizona",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03908320"
    },
    {
      "nct_id": "NCT02859337",
      "title": "Effectiveness of Orally Dosed Emergency Contraception in Obese Women - UPA",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Obesity",
        "Contraception"
      ],
      "interventions": [
        {
          "name": "UPA-ECx1",
          "type": "DRUG"
        },
        {
          "name": "UPA-ECx2",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Oregon Health and Science University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 35 Years · Female only"
      },
      "enrollment_count": 64,
      "start_date": "2017-05-30",
      "completion_date": "2023-11-15",
      "has_results": true,
      "last_update_posted_date": "2024-02-06",
      "last_synced_at": "2026-09-03T19:16:38.354Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02859337"
    }
  ]
}