{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=L-Tryptophan",
    "query": {
      "intervention": "L-Tryptophan"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 63,
    "total_pages": 7,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=L-Tryptophan&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-02T21:50:06.443Z",
  "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": "NCT00001918",
      "title": "L-5-HTP-Related EMS",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Eosinophilia-Myalgia Syndrome"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "National Institute of Mental Health (NIMH)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 20,
      "start_date": "1999-07",
      "completion_date": "2000-08",
      "has_results": false,
      "last_update_posted_date": "2008-03-04",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00001918"
    },
    {
      "nct_id": "NCT07115563",
      "title": "Daily Amino Acid Supplementation for People With Parkinson's Disease",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Parkinson Disease (PD)"
      ],
      "interventions": [
        {
          "name": "Targeted Amino Acid Supplement",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Control (placebo)",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Cristina Colon-Semenza",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "50 Years to 90 Years"
      },
      "enrollment_count": 30,
      "start_date": "2025-10-31",
      "completion_date": "2027-11",
      "has_results": false,
      "last_update_posted_date": "2026-08-13",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 2,
      "location_summary": "Farmington, Connecticut • Storrs, Connecticut",
      "locations": [
        {
          "city": "Farmington",
          "state": "Connecticut"
        },
        {
          "city": "Storrs",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07115563"
    },
    {
      "nct_id": "NCT00090831",
      "title": "Investigating the Role of Serotonin in Emotional Processing Through the Use of Tryptophan Depletion",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Healthy"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "National Institute of Mental Health (NIMH)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "20 Years to 50 Years"
      },
      "enrollment_count": 91,
      "start_date": "2004-08-31",
      "completion_date": "2012-09-17",
      "has_results": false,
      "last_update_posted_date": "2019-12-03",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00090831"
    },
    {
      "nct_id": "NCT02974699",
      "title": "Role of Gastrointestinal Microbes on Digestion of Resistant Starch and Tryptophan Availability to Humans",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Type II Diabetes"
      ],
      "interventions": [
        {
          "name": "Potato Starch (Bob's Red Mill)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Pregelatinized Starch (Resource ThickenUp)",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Wayne State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 20,
      "start_date": "2017-01",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2017-05-04",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 1,
      "location_summary": "Detroit, Michigan",
      "locations": [
        {
          "city": "Detroit",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02974699"
    },
    {
      "nct_id": "NCT02184832",
      "title": "Dietary Intake of Tryptophan and Metformin Response",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Metformin Response",
        "Fasting Glucose",
        "Tryptophan Concentration",
        "Metformin Concentration",
        "Diet Tolerability"
      ],
      "interventions": [
        {
          "name": "Metformin",
          "type": "DRUG"
        },
        {
          "name": "Low tryptophan diet",
          "type": "OTHER"
        },
        {
          "name": "High tryptophan diet",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "20 Years to 40 Years"
      },
      "enrollment_count": 20,
      "start_date": "2014-08",
      "completion_date": "2016-03",
      "has_results": false,
      "last_update_posted_date": "2016-03-16",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02184832"
    },
    {
      "nct_id": "NCT06378866",
      "title": "Stereotactic Body Radiation Therapy Plus Immediate or Delayed Androgen Receptor Pathway Inhibitor and Androgen Deprivation Therapy or Salvage Radiation Therapy for the Treatment of Prostate Cancer, DIVINE Trial",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Recurrent Castration-Sensitive Prostate Carcinoma",
        "Recurrent Prostate Cancer",
        "Castration-resistant Prostate Cancer",
        "Biochemically Recurrent Prostate Carcinoma"
      ],
      "interventions": [
        {
          "name": "Abiraterone",
          "type": "DRUG"
        },
        {
          "name": "Apalutamide",
          "type": "DRUG"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Bone Scan",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Darolutamide",
          "type": "DRUG"
        },
        {
          "name": "Degarelix",
          "type": "DRUG"
        },
        {
          "name": "Enzalutamide",
          "type": "DRUG"
        },
        {
          "name": "Goserelin",
          "type": "DRUG"
        },
        {
          "name": "Histrelin",
          "type": "DRUG"
        },
        {
          "name": "Leuprolide",
          "type": "DRUG"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Patient Observation",
          "type": "OTHER"
        },
        {
          "name": "Positron Emission Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Prednisone",
          "type": "DRUG"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        },
        {
          "name": "Relugolix",
          "type": "DRUG"
        },
        {
          "name": "Stereotactic Body Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Triptorelin",
          "type": "DRUG"
        },
        {
          "name": "Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Image-Guided Therapy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "PROCEDURE",
        "OTHER",
        "RADIATION"
      ],
      "sponsor": "Mayo Clinic",
      "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": 532,
      "start_date": "2024-06-03",
      "completion_date": "2031-02-28",
      "has_results": false,
      "last_update_posted_date": "2026-07-20",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 3,
      "location_summary": "Phoenix, Arizona • Jacksonville, Florida • Rochester, Minnesota",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06378866"
    },
    {
      "nct_id": "NCT05400733",
      "title": "Prandial Metabolic Phenotype in Adults",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Protein Metabolism"
      ],
      "interventions": [
        {
          "name": "Total Amino Acids",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Essential Amino Acids",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Essential Amino Acids + Hydroxy-methylbutyric acid (HMB)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Essential Amino Acids + Leucine",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Essential Amino Acids High",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo Water",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Texas A&M University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "60 Years to 80 Years"
      },
      "enrollment_count": 50,
      "start_date": "2022-06-24",
      "completion_date": "2026-09",
      "has_results": false,
      "last_update_posted_date": "2025-10-01",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 1,
      "location_summary": "College Station, Texas",
      "locations": [
        {
          "city": "College Station",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05400733"
    },
    {
      "nct_id": "NCT04423211",
      "title": "Treating Prostate Cancer That Has Come Back After Surgery With Apalutamide and Targeted Radiation Based on PET Imaging",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Biochemically Recurrent Prostate Carcinoma",
        "Metastatic Prostate Carcinoma",
        "Prostate Adenocarcinoma",
        "Stage IVB Prostate Cancer AJCC v8"
      ],
      "interventions": [
        {
          "name": "3-Dimensional Conformal Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Apalutamide",
          "type": "DRUG"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Degarelix",
          "type": "DRUG"
        },
        {
          "name": "External Beam Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Fluciclovine F18",
          "type": "OTHER"
        },
        {
          "name": "Goserelin Acetate",
          "type": "DRUG"
        },
        {
          "name": "Intensity-Modulated Proton Therapy",
          "type": "PROCEDURE"
        },
        {
          "name": "Intensity-Modulated Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Leuprolide Acetate",
          "type": "DRUG"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Positron Emission Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Quality-of-Life Assessment",
          "type": "OTHER"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        },
        {
          "name": "Relugolix",
          "type": "DRUG"
        },
        {
          "name": "Stereotactic Body Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Triptorelin",
          "type": "DRUG"
        },
        {
          "name": "Volume Modulated Arc Therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "RADIATION",
        "DRUG",
        "PROCEDURE",
        "OTHER"
      ],
      "sponsor": "ECOG-ACRIN Cancer Research Group",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 804,
      "start_date": "2020-10-08",
      "completion_date": "2032-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-08-19",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 341,
      "location_summary": "Anchorage, Alaska • Fairbanks, Alaska • Phoenix, Arizona + 240 more",
      "locations": [
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04423211"
    },
    {
      "nct_id": "NCT07222306",
      "title": "Cannabis, Neuroinflammation, and Suicidal Ideation: A Supplemental Brain Imaging Study",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "PTSD",
        "Suicidal Thoughts and Behaviors",
        "PTSD Symptoms",
        "Depressive Symptoms"
      ],
      "interventions": [
        {
          "name": "1-(2-[+F]fluoroethyl)-L-tryptophan",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Wayne State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": "69 Years",
        "sex": "ALL",
        "summary": "19 Years to 69 Years"
      },
      "enrollment_count": 100,
      "start_date": "2026-01-01",
      "completion_date": "2030-08-31",
      "has_results": false,
      "last_update_posted_date": "2026-08-06",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 1,
      "location_summary": "Detroit, Michigan",
      "locations": [
        {
          "city": "Detroit",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07222306"
    },
    {
      "nct_id": "NCT02077881",
      "title": "Study of IDO Inhibitor in Combination With Gemcitabine and Nab-Paclitaxel in Patients With Metastatic Pancreatic Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Metastatic Pancreatic Adenocarcinoma",
        "Metastatic Pancreatic Cancer"
      ],
      "interventions": [
        {
          "name": "Nab-Paclitaxel",
          "type": "DRUG"
        },
        {
          "name": "Gemcitabine",
          "type": "DRUG"
        },
        {
          "name": "Indoximod",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "NewLink Genetics Corporation",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 157,
      "start_date": "2014-08",
      "completion_date": "2018-10-17",
      "has_results": true,
      "last_update_posted_date": "2026-04-03",
      "last_synced_at": "2026-09-02T21:50:06.443Z",
      "location_count": 11,
      "location_summary": "Palo Alto, California • Augusta, Georgia • Lexington, Kentucky + 8 more",
      "locations": [
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "Augusta",
          "state": "Georgia"
        },
        {
          "city": "Lexington",
          "state": "Kentucky"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Paramus",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02077881"
    }
  ]
}