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Showing 1–24 of 254 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Retinol Clear all
Recruiting Not applicable Interventional

Anti-inflammatory Activities of Vitamin C Supplementation on the Gut Barrier Function in Adults With Obesity

NCT07151105
View directory record Official record
Conditions
Adequate Vitamin C Status, Inadequate Vitamin C Status
Interventions
Vitamin C Supplement + Low Vitamin C Diet, Placebo + Low Vitamin C Diet
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 50 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

RCT of an Oral Acne Supplement for Adult Women

NCT06097871
View directory record Official record
Conditions
Acne
Interventions
Skin Nutraceutical Supplement, Placebo pill
Dietary Supplement · Other
Lead sponsor
Nutraceutical Wellness Inc.
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
High Point, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 24, 2024 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Study to Identify if Chemist Confessions Retinol Cream Works to Improve the Appearance of Early Signs of Aging.

NCT05039476
View directory record Official record
Conditions
Wrinkle, Aging
Interventions
Retinol face cream, Placebo face cream
Dietary Supplement
Lead sponsor
Chemist Confessions, Inc.
Industry
Eligibility
30 Years to 50 Years · Female only
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Feb 7, 2023 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 1 Interventional

Study of Dasatinib and All-Trans Retinoic Acid for Relapsed/Refractory and/or Elderly Patients With Acute Myelogenous Leukemia (AML) or Myelodysplastic Syndrome

NCT00892190
View directory record Official record
Conditions
Acute Myelogenous Leukemia, Myelodysplastic Syndrome
Interventions
dasatinib (SPRYCEL), all trans retinoic acid (VESANOID)
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 9, 2016 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Topical Vitamin K, Vitamin K and Retinol, and Arnica on Post-Laser Bruising

NCT00363038
View directory record Official record
Conditions
Ecchymosis
Interventions
Petrolatum United States Pharmacopeia (USP), Vitamin K and retinol ointment, Arnica ointment, Vitamin K ointment
Drug
Lead sponsor
Northwestern University
Other
Eligibility
20 Years to 60 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 2, 2021 · Synced Sep 6, 2026, 2:01 PM EDT
Terminated Phase 2 Interventional Results available

MemoryXL Effects on Mild Cognitive Impairment Patients

NCT00903695
View directory record Official record
Conditions
Mild Cognitive Impairment
Interventions
Memory XL, placebo
Drug
Lead sponsor
University of Oklahoma
Other
Eligibility
55 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
2
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Jan 25, 2012 · Synced Sep 6, 2026, 2:01 PM EDT
Terminated Not applicable Interventional Results available

Effects of Ergocalciferol on Erythropoetin Stimulating Agent Dose

NCT01263028
View directory record Official record
Conditions
Chronic Kidney Disease Stages 3-5
Interventions
Ergocalciferol supplementation
Drug
Lead sponsor
Kaiser Permanente
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 29, 2015 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 3 Interventional Results available

Chemotherapy and Radiation Therapy in Treating Young Patients With Newly Diagnosed, Previously Untreated, High-Risk Medulloblastoma/PNET

NCT00392327
View directory record Official record
Conditions
Anaplastic Medulloblastoma, Medulloblastoma
Interventions
Biospecimen Collection, Carboplatin, Cisplatin, Cyclophosphamide, Filgrastim, Isotretinoin, Lumbar Puncture, Magnetic Resonance Imaging, Quality-of-Life Assessment, Radiation Therapy, Vincristine Sulfate
Procedure · Drug · Biological + 2 more
Lead sponsor
Children's Oncology Group
Network
Eligibility
3 Years to 22 Years
Enrollment
379 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2026
U.S. locations
170
States / cities
Birmingham, Alabama • Anchorage, Alaska • Mesa, Arizona + 126 more
Source: ClinicalTrials.gov public record
Updated Jun 7, 2026 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Investigating the Wrinkle Reduction Potential of a Novel Compounded Skin Care Cream

NCT03878381
View directory record Official record
Conditions
Skin Care
Interventions
Skin Care Cream, Placebo
Combination Product · Drug
Lead sponsor
Wayne State University
Other
Eligibility
20 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Dearborn, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 31, 2022 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 2 Interventional

Antioxidant Therapy in Lean and Obese Asthmatics

NCT01317563
View directory record Official record
Conditions
Asthma
Interventions
Vitamins A, E, C & Selenium, Placebo
Dietary Supplement
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
12 Years to 25 Years
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2016
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 21, 2016 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 3 Interventional Results available

Adapalene Gel 0.3% Versus Tretinoin 0.05% Emollient Cream for Treatment of Photodamage

NCT00647556
View directory record Official record
Conditions
Photoaging
Interventions
adapalene gel, 0.3%, tretinoin 0.05% emollient cream
Drug
Lead sponsor
Galderma R&D
Industry
Eligibility
40 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jul 31, 2022 · Synced Sep 6, 2026, 2:01 PM EDT
Completed No phase listed Observational

Vitamins, Breastmilk HIV Shedding, and Child Health

NCT00197756
View directory record Official record
Conditions
Maternal and Child Health Outcomes
Interventions
Vitamin A alone, Multivitamins excluding vitamin A, multivitamins including vitamin A, Placebo
Dietary Supplement · Other
Lead sponsor
Harvard School of Public Health (HSPH)
Other
Eligibility
18 Years and older · Female only
Enrollment
771 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 20, 2009 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 2Phase 3 Interventional

Evaluation of Tretinoin Cream on the Integrity of Aged Forearm Skin

NCT07084116
View directory record Official record
Conditions
Skin Tear, Solar Purpura, Dermatoporosis
Interventions
Tretinoin 0.1% cream, Bland cream (non-drug)
Drug
Lead sponsor
James Thomas Pathoulas
Other
Eligibility
55 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 6, 2026, 2:01 PM EDT
Active, not recruiting Phase 3 Interventional Results available

Tretinoin and Arsenic Trioxide in Treating Patients With Untreated Acute Promyelocytic Leukemia

NCT02339740
View directory record Official record
Conditions
Acute Promyelocytic Leukemia With t(15;17)(q24.1;q21.2); PML-RARA
Interventions
Arsenic Trioxide, Cytarabine, Dexamethasone, Idarubicin, Laboratory Biomarker Analysis, Mitoxantrone Hydrochloride, Quality-of-Life Assessment, Questionnaire Administration, Tretinoin
Drug · Other
Lead sponsor
Children's Oncology Group
Network
Eligibility
12 Months to 21 Years
Enrollment
158 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2029
U.S. locations
152
States / cities
Birmingham, Alabama • Mobile, Alabama • Anchorage, Alaska + 121 more
Source: ClinicalTrials.gov public record
Updated Feb 17, 2026 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 2 Interventional Results available

To Immunize Patients With Extensive Stage SCLC Combined With Chemo With or Without All Trans Retinoic Acid

NCT00617409
View directory record Official record
Conditions
Small Cell Lung Cancer
Interventions
Paclitaxel, Drug: Ad.p53-DC vaccines, All -trans Retinoic Acid (ATRA)
Drug · Biological
Lead sponsor
H. Lee Moffitt Cancer Center and Research Institute
Other
Eligibility
18 Years and older
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2019
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Nov 7, 2019 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 1 Interventional

Combination Therapy With Ursodeoxycholic Acid (UDCA) and All-Trans Retinoic Acid (ATRA) for Treatment of Primary Sclerosing Cholangitis

NCT01456468
View directory record Official record
Conditions
Cholangitis, Sclerosing
Interventions
Oral all-trans retinoic acid (ATRA)
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 80 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
2
States / cities
New Haven, Connecticut • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 13, 2016 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Pilot Feasibility of Rice Bran Supplementation in Children

NCT02557373
View directory record Official record
Conditions
Dietary Rice Bran Supplementation
Interventions
Vitamin A, Rice Bran + Vitamin A
Dietary Supplement
Lead sponsor
Colorado State University
Other
Eligibility
4 Months to 10 Months
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 20, 2017 · Synced Sep 6, 2026, 2:01 PM EDT
Not listed Not applicable Interventional

Vitamin A Supplementation in Preterm Infants

NCT00063596
View directory record Official record
Conditions
Infant, Premature
Interventions
Vitamin A supplementation
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
1 Day to 3 Days
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2004
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 2 Interventional Results available

A Study of Acne Treatment in Children Ages 9 to 11

NCT00907335
View directory record Official record
Conditions
Acne Vulgaris
Interventions
Retin-A Micro 0.04% facial acne treatment, Vehicle control
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
9 Years to 11 Years
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
12
States / cities
Encino, California • San Diego, California • Miami, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated Feb 14, 2012 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 3 Interventional Results available

A Clinical Study to Evaluate the Safety and Effectiveness of an Investigational Product Called CT Gel

NCT00689117
View directory record Official record
Conditions
Acne Vulgaris, Acne
Interventions
CT Gel, Clindamycin Gel (clindamycin ), Tretinoin Gel (tretinoin), Vehicle Gel
Drug
Lead sponsor
Stiefel, a GSK Company
Industry
Eligibility
12 Years and older
Enrollment
1,649 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
27
States / cities
Birmingham, Alabama • Mobile, Alabama • Hot Springs, Arkansas + 24 more
Source: ClinicalTrials.gov public record
Updated May 29, 2017 · Synced Sep 6, 2026, 2:01 PM EDT
Not yet recruiting Not applicable Interventional

Vitamin A Supplementation and Breast Milk Vitamin A Levels in Mothers of Preterm Infants

NCT07736768
View directory record Official record
Conditions
Premature, Preterm Infant Health, Vitamin A Deficiency, Human Milk, Breastfeeding
Interventions
Oral multivitamin containing vitamin A
Dietary Supplement
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
18 Years to 45 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Bioavailability of Golden Rice Carotenoids in Humans

NCT00680355
View directory record Official record
Conditions
Healthy
Interventions
golden rice, corn oil 0g, corn oil 10g, coren oil 5 g
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
40 Years to 70 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 30, 2013 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Not applicable Interventional

Efficacy of Vitamin D Supplementation in Obese Children

NCT02956408
View directory record Official record
Conditions
Obesity, Pediatric, Obesity, Childhood, Obesity, Morbid, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
5 Years to 11 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Sep 6, 2026, 2:01 PM EDT
Completed Phase 1Phase 2 Interventional

Combination Therapy in Amyotrophic Lateral Sclerosis (ALS)

NCT00919555
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis
Interventions
Pioglitazone and Tretinoin, Tretinoin and Pioglitazone HCL, Placebo
Drug
Lead sponsor
Phoenix Neurological Associates, LTD
Other
Eligibility
18 Years to 85 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 29, 2012 · Synced Sep 6, 2026, 2:01 PM EDT