{ "api_version": "1", "request": { "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Placebo+%28Vitamin+C%29&page=3", "query": { "intervention": "Placebo (Vitamin C)", "page": 3 }, "page_size": 10 }, "pagination": { "page": 3, "page_size": 10, "total_count": 186, "total_pages": 19, "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Placebo+%28Vitamin+C%29&page=4&page_size=10", "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Placebo+%28Vitamin+C%29&page=2&page_size=10" }, "source": "remote", "last_synced_at": "2026-10-10T06:24:16.159Z", "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": "NCT00142610", "title": "The Role of Vitamins E and C in Maintaining Lung Health in People With Asthma", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE1" ], "conditions": [ "Asthma" ], "interventions": [ { "name": "Vitamin", "type": "DIETARY_SUPPLEMENT" } ], "intervention_types": [ "DIETARY_SUPPLEMENT" ], "sponsor": "University of North Carolina, Chapel Hill", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": "50 Years", "sex": "ALL", "summary": "18 Years to 50 Years" }, "enrollment_count": 16, "start_date": "2005-08", "completion_date": "2007-12", "has_results": false, "last_update_posted_date": "2013-03-04", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 1, "location_summary": "Chapel Hill, North Carolina", "locations": [ { "city": "Chapel Hill", "state": "North Carolina" } ], "official_url": "https://clinicaltrials.gov/study/NCT00142610" }, { "nct_id": "NCT00117403", "title": "Anti-Oxidant Treatment of Alzheimer's Disease", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE1" ], "conditions": [ "Alzheimer's Disease" ], "interventions": [ { "name": "Vitamin E, Vitamin C, and Alpha-lipoic Acid", "type": "DRUG" }, { "name": "Coenzyme Q", "type": "DRUG" }, { "name": "Placebo capsules", "type": "DRUG" }, { "name": "Placebo wafers", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "National Institute on Aging (NIA)", "sponsor_class": "NIH", "healthy_volunteers": false, "eligibility": { "minimum_age": "60 Years", "maximum_age": "85 Years", "sex": "ALL", "summary": "60 Years to 85 Years" }, "enrollment_count": 75, "start_date": "2006-01", "completion_date": "2007-09", "has_results": false, "last_update_posted_date": "2009-04-03", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 13, "location_summary": "Tucson, Arizona • Irvine, California • La Jolla, California + 10 more", "locations": [ { "city": "Tucson", "state": "Arizona" }, { "city": "Irvine", "state": "California" }, { "city": "La Jolla", "state": "California" }, { "city": "Los Angeles", "state": "California" }, { "city": "Miami Beach", "state": "Florida" } ], "official_url": "https://clinicaltrials.gov/study/NCT00117403" }, { "nct_id": "NCT01708278", "title": "Beneficial Effects of Quercetin in Chronic Obstructive Pulmonary Disease (COPD)", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE1" ], "conditions": [ "Chronic Obstructive Pulmonary Disease" ], "interventions": [ { "name": "Quercetin", "type": "DRUG" }, { "name": "Placebo - sugar chew", "type": "OTHER" } ], "intervention_types": [ "DRUG", "OTHER" ], "sponsor": "University of Michigan", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "40 Years", "maximum_age": "80 Years", "sex": "ALL", "summary": "40 Years to 80 Years" }, "enrollment_count": 9, "start_date": "2014-02", "completion_date": "2015-10", "has_results": true, "last_update_posted_date": "2016-12-26", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 1, "location_summary": "Ann Arbor, Michigan", "locations": [ { "city": "Ann Arbor", "state": "Michigan" } ], "official_url": "https://clinicaltrials.gov/study/NCT01708278" }, { "nct_id": "NCT03895749", "title": "Effect of a Nitric Oxide Supplementation Product on Endothelial Dysfunction and Prehypertensive Adults", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "NA" ], "conditions": [ "Hypertension" ], "interventions": [ { "name": "NEO40 Daily", "type": "DIETARY_SUPPLEMENT" } ], "intervention_types": [ "DIETARY_SUPPLEMENT" ], "sponsor": "Hypertension Institute, Nashville", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": "75 Years", "sex": "ALL", "summary": "18 Years to 75 Years" }, "enrollment_count": 42, "start_date": "2017-04-05", "completion_date": "2018-04-18", "has_results": false, "last_update_posted_date": "2019-10-30", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 1, "location_summary": "Nashville, Tennessee", "locations": [ { "city": "Nashville", "state": "Tennessee" } ], "official_url": "https://clinicaltrials.gov/study/NCT03895749" }, { "nct_id": "NCT01897792", "title": "Effect of Antioxidant Vitamins on Coagulopathy and Nosocomial Pneumonia After Severe Trauma", "overall_status": "TERMINATED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Coagulopathy", "Nosocomial Pneumonia" ], "interventions": [ { "name": "Vitamin C", "type": "DIETARY_SUPPLEMENT" }, { "name": "Vitamin E", "type": "DIETARY_SUPPLEMENT" }, { "name": "Saline (for Vitamin C)", "type": "DIETARY_SUPPLEMENT" }, { "name": "Placebo (for Vitamin E)", "type": "DRUG" } ], "intervention_types": [ "DIETARY_SUPPLEMENT", "DRUG" ], "sponsor": "University of Alabama at Birmingham", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "19 Years", "maximum_age": null, "sex": "ALL", "summary": "19 Years and older" }, "enrollment_count": 11, "start_date": "2013-05", "completion_date": "2015-02", "has_results": true, "last_update_posted_date": "2017-03-29", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 1, "location_summary": "Birmingham, Alabama", "locations": [ { "city": "Birmingham", "state": "Alabama" } ], "official_url": "https://clinicaltrials.gov/study/NCT01897792" }, { "nct_id": "NCT04001647", "title": "Targeting ER Stress in Vascular Dysfunction", "overall_status": "TERMINATED", "study_type": "INTERVENTIONAL", "phases": [ "EARLY_PHASE1" ], "conditions": [ "Vasodilation", "Arterial Stiffness" ], "interventions": [ { "name": "Acetylcholine", "type": "DRUG" }, { "name": "Sodium Nitroprusside", "type": "DRUG" }, { "name": "Ascorbic Acid", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Colorado State University", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": "80 Years", "sex": "ALL", "summary": "18 Years to 80 Years" }, "enrollment_count": 17, "start_date": "2019-06-01", "completion_date": "2022-08-16", "has_results": false, "last_update_posted_date": "2025-04-08", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 1, "location_summary": "Fort Collins, Colorado", "locations": [ { "city": "Fort Collins", "state": "Colorado" } ], "official_url": "https://clinicaltrials.gov/study/NCT04001647" }, { "nct_id": "NCT04335084", "title": "A Study of Hydroxychloroquine, Vitamin C, Vitamin D, and Zinc for the Prevention of COVID-19 Infection", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "COVID-19", "Coronavirus Infection", "Sars-CoV2", "Corona Virus Infection", "COVID", "Coronavirus", "Coronavirus-19", "Coronavirus 19" ], "interventions": [ { "name": "Hydroxychloroquine", "type": "DRUG" }, { "name": "Vitamin C", "type": "DIETARY_SUPPLEMENT" }, { "name": "Vitamin D", "type": "DIETARY_SUPPLEMENT" }, { "name": "Zinc", "type": "DIETARY_SUPPLEMENT" } ], "intervention_types": [ "DRUG", "DIETARY_SUPPLEMENT" ], "sponsor": "ProgenaBiome", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 254, "start_date": "2020-06-22", "completion_date": "2024-04-11", "has_results": false, "last_update_posted_date": "2025-06-05", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 1, "location_summary": "Ventura, California", "locations": [ { "city": "Ventura", "state": "California" } ], "official_url": "https://clinicaltrials.gov/study/NCT04335084" }, { "nct_id": "NCT02516670", "title": "Docetaxel With or Without Ascorbic Acid in Treating Patients With Metastatic Prostate Cancer", "overall_status": "TERMINATED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Hormone-Resistant Prostate Cancer", "Metastatic Prostate Carcinoma", "Stage IV Prostate Cancer" ], "interventions": [ { "name": "Ascorbic Acid", "type": "DIETARY_SUPPLEMENT" }, { "name": "Docetaxel", "type": "DRUG" }, { "name": "Laboratory Biomarker Analysis", "type": "OTHER" }, { "name": "Pharmacological Study", "type": "OTHER" }, { "name": "Placebo", "type": "OTHER" }, { "name": "Quality-of-Life Assessment", "type": "OTHER" } ], "intervention_types": [ "DIETARY_SUPPLEMENT", "DRUG", "OTHER" ], "sponsor": "Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins", "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": 50, "start_date": "2016-06-20", "completion_date": "2021-10-14", "has_results": true, "last_update_posted_date": "2023-06-07", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 6, "location_summary": "Washington D.C., District of Columbia • Annapolis, Maryland • Baltimore, Maryland + 3 more", "locations": [ { "city": "Washington D.C.", "state": "District of Columbia" }, { "city": "Annapolis", "state": "Maryland" }, { "city": "Baltimore", "state": "Maryland" }, { "city": "Detroit", "state": "Michigan" }, { "city": "Cleveland", "state": "Ohio" } ], "official_url": "https://clinicaltrials.gov/study/NCT02516670" }, { "nct_id": "NCT03909789", "title": "Effect of Inorganic Nitrate Supplement on Blood Pressure", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "NA" ], "conditions": [ "Blood Pressure", "Endothelial Dysfunction" ], "interventions": [ { "name": "Plant based bioequivalent Nitrate supplementation", "type": "DIETARY_SUPPLEMENT" }, { "name": "Placebo", "type": "DIETARY_SUPPLEMENT" } ], "intervention_types": [ "DIETARY_SUPPLEMENT" ], "sponsor": "Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "40 Years", "maximum_age": "75 Years", "sex": "ALL", "summary": "40 Years to 75 Years" }, "enrollment_count": 67, "start_date": "2017-11-17", "completion_date": "2018-06-22", "has_results": false, "last_update_posted_date": "2019-04-12", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 1, "location_summary": "Torrance, California", "locations": [ { "city": "Torrance", "state": "California" } ], "official_url": "https://clinicaltrials.gov/study/NCT03909789" }, { "nct_id": "NCT04134091", "title": "The Efficacy, Safety and Tolerability of Oral LPCN 1144 in Subjects With Nonalcoholic Steatohepatitis", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Nonalcoholic Steatohepatitis (NASH)" ], "interventions": [ { "name": "LPCN 1144 Formulation A", "type": "DRUG" }, { "name": "LPCN 1144 Formulation B", "type": "DRUG" }, { "name": "Placebo", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Lipocine Inc.", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": "80 Years", "sex": "MALE", "summary": "18 Years to 80 Years · Male only" }, "enrollment_count": 56, "start_date": "2019-08-27", "completion_date": "2021-06-24", "has_results": true, "last_update_posted_date": "2023-12-14", "last_synced_at": "2026-10-10T06:24:16.159Z", "location_count": 19, "location_summary": "El Cajon, California • Murrieta, California • Rialto, California + 14 more", "locations": [ { "city": "El Cajon", "state": "California" }, { "city": "Murrieta", "state": "California" }, { "city": "Rialto", "state": "California" }, { "city": "Roseville", "state": "California" }, { "city": "Maitland", "state": "Florida" } ], "official_url": "https://clinicaltrials.gov/study/NCT04134091" } ] }