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Showing 1–24 of 69 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Cocoa extract Clear all
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of Dark Chocolate (70% Cacao) on EEG Brain Waves in Vigorously Active Individuals

NCT03203824
View directory record Official record
Conditions
Healthy
Interventions
dark chocolate, non dark chocolate
Dietary Supplement · Other
Lead sponsor
Loma Linda University
Other
Eligibility
21 Years to 45 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Jun 24, 2018 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Long Term Cocoa Flavanol Intake on Blood Pressure and Platelet Function in Healthy Adults, Part 2

NCT02447783
View directory record Official record
Conditions
Healthy
Interventions
Control Capsules, Mars Cocoa Extract Capsules
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
30 Years to 55 Years
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated May 29, 2017 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional

Personalized Research on Diet in Ulcerative Colitis and Crohn's Disease

NCT03301311
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Crohn Disease, Ulcerative Colitis, Indeterminate Colitis
Interventions
Specific Carbohydrate Diet (SCD), Modified Specific Carbohydrate Diet (MSCD)
Other
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
7 Years to 18 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
20
States / cities
Little Rock, Arkansas • Los Angeles, California • Oakland, California + 17 more
Source: ClinicalTrials.gov public record
Updated Jun 27, 2022 · Synced Sep 4, 2026, 8:43 PM EDT
Recruiting Phase 1Phase 2 Interventional

Cocoa to Maximize Exercise Training in Older Adults - The COMET Trial

NCT07161726
View directory record Official record
Conditions
Mobility Disability
Interventions
(-)-Epicatechin-rich cocoa supplementation combined with exercise training, Placebo combined with exercise training
Combination Product
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
55 Years and older
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Intake-dependent Effect of Cocoa Flavanol Absorption, Metabolism and Excretion in Humans

NCT03201822
View directory record Official record
Conditions
Healthy
Interventions
100 mg of Cocoa Flavanols/70 kg BW, 200 mg of Cocoa Flavanols/70 kg BW, 400 mg of Cocoa Flavanols/70 kg BW, 1000 mg of Cocoa Flavanols/70 kg BW
Other
Lead sponsor
University of California, Davis
Other
Eligibility
25 Years to 40 Years · Male only
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jun 27, 2017 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional

Cocoa Polyphenols and Postprandial Metabolism in Type 2 Diabetes

NCT01886989
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Cocoa polyphenols
Dietary Supplement
Lead sponsor
Arpita Basu
Other
Eligibility
21 Years to 60 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Stillwater, Oklahoma
Source: ClinicalTrials.gov public record
Updated Jan 22, 2018 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional

Effects of Cocoa on Ambulatory Blood Pressure and Vascular Function in Patients With Stage I Hypertension

NCT01672840
View directory record Official record
Conditions
Hypertension
Interventions
5g Cocoa Consumption, 10g Cocoa Consumption
Dietary Supplement
Lead sponsor
Griffin Hospital
Other
Eligibility
18 Years to 75 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
2
States / cities
Derby, Connecticut • Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 25, 2020 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Food Matrix Effect on Flavanol Absorption, Metabolism and Excretion: Methylxanthines

NCT03526107
View directory record Official record
Conditions
Healthy
Interventions
CF Control, CF-Theobromine, CF-Caffeine
Other
Lead sponsor
University of California, Davis
Other
Eligibility
25 Years to 60 Years · Male only
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
2
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Oct 9, 2022 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Role of Flavanols in Exercise and Aging

NCT01557738
View directory record Official record
Conditions
Aging
Interventions
High Flavanol Trial, Low Flavanol Trial, High Flavanol Trial; long-term, Low Flavanol Trial; long-term effects
Dietary Supplement
Lead sponsor
University of Texas at Austin
Other
Eligibility
18 Years to 80 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Jun 24, 2014 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional

Effects of Epicatechin on Functional Capacity, Skeletal Muscle Structure and Diastolic Function in Patients With Heart Failure With Preserved Ejection Fraction (HFPEF)

NCT02068040
View directory record Official record
Conditions
Heart Failure
Interventions
CocoaVia
Dietary Supplement
Lead sponsor
University of California, San Diego
Other
Eligibility
40 Years to 60 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jun 2, 2015 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Phase 4 Interventional Results available

Antitussive Effect of a Naturally Flavored Syrup Containing Diphenhydramine, Compared With Dextromethorphan and Placebo

NCT02062710
View directory record Official record
Conditions
Cough Reflex Sensitivity
Interventions
diphenhydramine/phenylephrine/cocoa; dextromethorophan; placebo, diphenhydramine/phenylephrine/cocoa; placebo; dextromethorphan, dextromethorphan; diphenhydramine/phenylephrine/cocoa; placebo, dextromethorophan; placebo; diphenhydramine/phenylephrine/cocoa, placebo; diphenhydramine/phenylephrine/cocoa; dextromethorphan, placebo; dextromethorphan; diphenhydramine/phenylephrine/cocoa
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Feb 27, 2018 · Synced Sep 4, 2026, 8:43 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

COcoa Supplement and Multivitamin Outcomes Study for the Mind

NCT03035201
View directory record Official record
Conditions
Cognitive Impairment, Dementia, Aging
Interventions
Not listed
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
65 Years and older
Enrollment
2,262 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 21, 2023 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional

Cocoa and Metabolic Health in Prediabetes

NCT02203240
View directory record Official record
Conditions
Prediabetes
Interventions
Cocoa, Placebo
Other
Lead sponsor
Virginia Polytechnic Institute and State University
Other
Eligibility
40 Years to 75 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Blacksburg, Virginia
Source: ClinicalTrials.gov public record
Updated Sep 20, 2023 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

An Exploratory Investigation of a B12 Vitamin to Increase Energy and Focus

NCT05517005
View directory record Official record
Conditions
B12 Deficiency Vitamin, Energy Supply; Deficiency, Mood
Interventions
Hype Bites Supplement
Dietary Supplement
Lead sponsor
Sourse
Industry
Eligibility
24 Years to 65 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 22, 2024 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

MINDSpeed Food and Brain Training RCT

NCT03419052
View directory record Official record
Conditions
Low Education, Cognition, Cognitive Training, Polyphenols
Interventions
Speed of processing training, MIND foods, Cognitive training control, Control foods
Behavioral
Lead sponsor
Indiana University
Other
Eligibility
60 Years and older
Enrollment
212 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2024
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Mar 6, 2025 · Synced Sep 4, 2026, 8:43 PM EDT
Terminated Not applicable Interventional Results available

Flavanol Augmentation for Antidepressant Non-Responsive Late Life Depression

NCT02943096
View directory record Official record
Conditions
Depression, Major Depressive Disorder
Interventions
CocoaVia, Placebo
Dietary Supplement · Other
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
60 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 5, 2019 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Cocoa Shot on the Human Brain 2

NCT02080845
View directory record Official record
Conditions
Caffeine
Interventions
no caffeine, high caffeine, no theobromine, low theobromine, high theobromine
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 55 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 17, 2018 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional

Flavanol-Rich Cocoa and Cerebral Blood Flow

NCT00825695
View directory record Official record
Conditions
Hypertension, Diabetes
Interventions
cocoa
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
65 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 29, 2014 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effect of Phytochemicals From Theobroma Cacao on Mental Energy

NCT01651793
View directory record Official record
Conditions
Mental Fatigue
Interventions
Caffeinated cocoa, Cocoa, Caffeine, Placebo
Other
Lead sponsor
University of Georgia
Other
Eligibility
18 Years to 34 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Athens, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 24, 2018 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Dietary Flavanols and Dentate Gyrus Function

NCT02312310
View directory record Official record
Conditions
Memory Loss
Interventions
Cocoa Flavanol
Dietary Supplement
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
50 Years to 75 Years
Enrollment
211 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 10, 2020 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Phase 1 Interventional

Effect of Cocoa Flavanols on Vascular Function

NCT00553774
View directory record Official record
Conditions
Coronary Artery Disease
Interventions
Cocoa Flavanols, Placebo
Dietary Supplement · Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 100 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Oct 26, 2016 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Cocoa Shot on the Human Brain

NCT01924481
View directory record Official record
Conditions
Caffeine, Flavonoids
Interventions
High Caffeine, Low caffeine, High theobromine, low theobromine, No theobromine
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 38 Years
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 17, 2018 · Synced Sep 4, 2026, 8:43 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Absorption and Metabolism of Dietary Cocoa Procyanidins in Humans

NCT01483508
View directory record Official record
Conditions
Healthy
Interventions
Flavanol- and procyanidins-containing drink, Procyanidins-containing drink, Flavanol-containing drink
Other
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 70 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Oct 24, 2012 · Synced Sep 4, 2026, 8:43 PM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Black Forest Cocoa Flavanol Supplementation and Health Trial

NCT07747714
View directory record Official record
Conditions
Endothelial Function, Oxidative Stress, Inflamation, Vascular Health
Interventions
Cocoa Flavanol Supplement, Low-Flavanol Control Powder
Dietary Supplement
Lead sponsor
The Black Forest LLC
Industry
Eligibility
30 Years to 75 Years · Male only
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
2
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Aug 4, 2026 · Synced Sep 4, 2026, 8:43 PM EDT