{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=L-theanine+capsule",
    "query": {
      "intervention": "L-theanine capsule"
    },
    "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": "2026-09-21T07:25:47.925Z",
  "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": "NCT03364101",
      "title": "The Poweroff Sleep Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Sleep"
      ],
      "interventions": [
        {
          "name": "Placebo Capsule",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "POWEROFF Capsule",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "NYU Langone Health",
      "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": 60,
      "start_date": "2017-10-01",
      "completion_date": "2018-04-24",
      "has_results": false,
      "last_update_posted_date": "2018-05-22",
      "last_synced_at": "2026-09-21T07:25:47.925Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03364101"
    },
    {
      "nct_id": "NCT05592561",
      "title": "Impact of Supplements on Stress Markers",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Physiological Stress"
      ],
      "interventions": [
        {
          "name": "mental stress task",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Texas State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 109,
      "start_date": "2022-01-25",
      "completion_date": "2023-04-10",
      "has_results": false,
      "last_update_posted_date": "2023-04-12",
      "last_synced_at": "2026-09-21T07:25:47.925Z",
      "location_count": 1,
      "location_summary": "San Marcos, Texas",
      "locations": [
        {
          "city": "San Marcos",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05592561"
    },
    {
      "nct_id": "NCT03019523",
      "title": "The Effect of a Caffeine Blend on Reaction Time, Mental Performance and Focus in Athletic Males",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Mental Fatigue"
      ],
      "interventions": [
        {
          "name": "Caffeine Blend",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Sugar Pill",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "University of Mary Hardin-Baylor",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "25 Years",
        "sex": "MALE",
        "summary": "18 Years to 25 Years · Male only"
      },
      "enrollment_count": 31,
      "start_date": "2016-08",
      "completion_date": "2016-12",
      "has_results": false,
      "last_update_posted_date": "2017-01-25",
      "last_synced_at": "2026-09-21T07:25:47.925Z",
      "location_count": 1,
      "location_summary": "Belton, Texas",
      "locations": [
        {
          "city": "Belton",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03019523"
    },
    {
      "nct_id": "NCT01851122",
      "title": "The Effect of the Amino Acid L-Theanine on Alertness and Vigilance",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Theanine, (L)-Isomer"
      ],
      "interventions": [
        {
          "name": "L-theanine capsule",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo capsule",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "The University of Texas Health Science Center, Houston",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 26,
      "start_date": "2011-11",
      "completion_date": "2012-10",
      "has_results": false,
      "last_update_posted_date": "2023-12-13",
      "last_synced_at": "2026-09-21T07:25:47.925Z",
      "location_count": 1,
      "location_summary": "Sugar Land, Texas",
      "locations": [
        {
          "city": "Sugar Land",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01851122"
    },
    {
      "nct_id": "NCT07189442",
      "title": "L-theanine and Paraxanthine for Cognitive Improvement in Adults With ADHD and ASD",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Attention Deficit Hyperactivity Disorder (ADHD)",
        "Autism Spectrum Disorder (ASD)"
      ],
      "interventions": [
        {
          "name": "L-theanine and paraxanthine",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Texas Tech University Health Sciences Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "MALE",
        "summary": "Male only"
      },
      "enrollment_count": 17,
      "start_date": "2025-10-01",
      "completion_date": "2026-06-01",
      "has_results": false,
      "last_update_posted_date": "2026-08-24",
      "last_synced_at": "2026-09-21T07:25:47.925Z",
      "location_count": 1,
      "location_summary": "Lubbock, Texas",
      "locations": [
        {
          "city": "Lubbock",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07189442"
    },
    {
      "nct_id": "NCT04749745",
      "title": "Effects of L-theanine on Motor Cortex Excitability in Healthy Subjects: A Paired-Pulse TMS Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Cortical Excitability",
        "Psychiatric Disorder"
      ],
      "interventions": [
        {
          "name": "L-theanine",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Butler Hospital",
      "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": 11,
      "start_date": "2020-06-09",
      "completion_date": "2021-05-31",
      "has_results": true,
      "last_update_posted_date": "2021-09-23",
      "last_synced_at": "2026-09-21T07:25:47.925Z",
      "location_count": 1,
      "location_summary": "Providence, Rhode Island",
      "locations": [
        {
          "city": "Providence",
          "state": "Rhode Island"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04749745"
    }
  ]
}