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Showing 1–21 of 21 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: K+ supplement Clear all
Withdrawn Phase 2Phase 3 Interventional Accepts healthy volunteers

Effects of a Supplement Derived From Palm Oil on Cholesterol Levels and Chinese Red Yeast Rice in the Blood

NCT02142569
View directory record Official record
Conditions
Cholesterol Lowering
Interventions
Sugar Pill, Chinese Red Yeast Rice (CRYR), CRYR + TRF, Tocotrienol-enriched Fraction of Palm Oil (TRF)
Drug · Device
Lead sponsor
University of California, Los Angeles
Other
Eligibility
35 Years to 70 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 10, 2019 · Synced Sep 5, 2026, 5:18 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Phosphorus Additives on the Metabolome in Healthy Adults

NCT03841786
View directory record Official record
Conditions
Metabolic Syndrome, Insulin Sensitivity, Cardiovascular Diseases
Interventions
Phosphorus-supplemented study diet, Control Diet
Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 45 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Dec 28, 2022 · Synced Sep 5, 2026, 5:18 PM EDT
Not listed Phase 1Phase 2 Interventional Accepts healthy volunteers

Retention of Potassium From Potatoes and Potassium Gluconate, and the Effect on Blood Pressure.

NCT02697708
View directory record Official record
Conditions
Hypertensive Disease
Interventions
Potassium control diet, Potassium gluconate diet, Potato Diet, French Fries Diet
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
21 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 8, 2018 · Synced Sep 5, 2026, 5:18 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

The Benefits of Natural Medicine, Vitamin IV Therapy and Supplements: Maintaining Good Health Through Nature

NCT05067998
View directory record Official record
Conditions
Anxiety Disorders and Symptoms, Fibromyalgia, Arthritis, Chronic Pain, Hypertension,Essential
Interventions
IV Vitamin Infused Therapy Treatment, Herbal medicine
Dietary Supplement · Drug
Lead sponsor
Faith A. Richardson
Other
Eligibility
21 Years to 80 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Dover, Delaware
Source: ClinicalTrials.gov public record
Updated Sep 22, 2025 · Synced Sep 5, 2026, 5:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Comparative Study of the Topcon Tonometers CT-800 and TRK-2P and the Haag-Streit Goldmann Manual Tonometer and Topcon SP-1P

NCT03439774
View directory record Official record
Conditions
Intraocular Pressure
Interventions
Topcon CT-800, Topcon TRK-2P
Device
Lead sponsor
Topcon Medical Systems, Inc.
Industry
Eligibility
18 Years and older
Enrollment
345 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Andover, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 7, 2022 · Synced Sep 5, 2026, 5:18 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Effects of Anorexia Nervosa on Peak Bone Mass

NCT01301183
View directory record Official record
Conditions
Anorexia Nervosa
Interventions
RhIGF-1 with transdermal 17-beta estradiol, Placebo and transdermal 17-beta estradiol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
14 Years to 22 Years · Female only
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 12, 2021 · Synced Sep 5, 2026, 5:18 PM EDT
Completed Phase 2 Interventional Results available

Effects of an Antioxidant-Enriched Multivitamin Supplement on Inflammation and Oxidative Stress in Cystic Fibrosis

NCT01859390
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
AquADEKs-2, control multivitamin
Drug · Dietary Supplement
Lead sponsor
University of Colorado, Denver
Other
Eligibility
10 Years and older
Enrollment
73 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
15
States / cities
Tucson, Arizona • Aurora, Colorado • Orlando, Florida + 12 more
Source: ClinicalTrials.gov public record
Updated Jul 13, 2017 · Synced Sep 5, 2026, 5:18 PM EDT
Completed Phase 2 Interventional Results available

The Effects of Potassium on Glucose Metabolism in African Americans

NCT02236598
View directory record Official record
Conditions
Borderline Hypokalemia
Interventions
K+ supplement, Placebo
Drug
Lead sponsor
Duke University
Other
Eligibility
30 Years and older
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 22, 2017 · Synced Sep 5, 2026, 5:18 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Vitamin K Supplementation Study in Healthy Volunteers (Aim 2B)

NCT04450212
View directory record Official record
Conditions
Vitamin K Status
Interventions
Phase I, Buccal Swab Collection for DNA Isolation, Phase II, Vitamin K (Vitacost) Supplementation
Genetic · Dietary Supplement
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
106 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2023
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Dec 18, 2023 · Synced Sep 5, 2026, 5:18 PM EDT
Recruiting Phase 4 Interventional

Hydroxycitrate: A Novel Therapy for Calcium Phosphate Urinary Stones

NCT06003348
View directory record Official record
Conditions
Calcium Phosphate Kidney Stones
Interventions
OHCit- standard dose, Potassium Citrate, Placebo, OHCit- low dose
Dietary Supplement · Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years to 99 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jun 1, 2026 · Synced Sep 5, 2026, 5:18 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin K and Glucose Metabolism in Adults at Risk for Diabetes (Vita-K 'n' Adults Study)

NCT02366481
View directory record Official record
Conditions
Obesity, Insulin Resistance, Insulin Sensitivity, Beta-Cell Dysfunction, Prediabetes
Interventions
Placebo, Low-Dose Vitamin K2 Supplement (menaquinone-7; 90-mcg/d), High-Dose Vitamin K2 Supplement (menaquinone-7; 180-mcg/d)
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 19, 2019 · Synced Sep 5, 2026, 5:18 PM EDT
Not yet recruiting Phase 2 Interventional Accepts healthy volunteers

Value of Potassium Magnesium Citrate in Preventing and Treating Hypertension in African Americans

NCT05145309
View directory record Official record
Conditions
Hypertension
Interventions
KMgCit, Placebo
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years and older
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2032
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 16, 2025 · Synced Sep 5, 2026, 5:18 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Effect of Vitamin K on Age-Related Bone Loss and Vascular Calcification

NCT00183001
View directory record Official record
Conditions
Osteoporosis, Vascular Calcification, Inflammation
Interventions
Vitamin K
Drug
Lead sponsor
National Institute on Aging (NIA)
NIH
Eligibility
60 Years to 80 Years
Enrollment
452 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2001 – 2006
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 15, 2009 · Synced Sep 5, 2026, 5:18 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Role Of Phosphorus And FGF 23 In Patients With Dent Disease

NCT02016235
View directory record Official record
Conditions
Dent Disease
Interventions
Phosphorus Supplement, Observation
Drug · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
Male only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 22, 2020 · Synced Sep 5, 2026, 5:18 PM EDT
Terminated Phase 3 Interventional Results available

Vitamin D Supplement Study for Stage Three and Four Chronic Kidney Disease (CKD) Patients

NCT01173848
View directory record Official record
Conditions
Chronic Kidney Disease Stage 3 and 4
Interventions
Ergocalciferol, Cholecalciferol
Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 99 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 3, 2017 · Synced Sep 5, 2026, 5:18 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Early Achievements - Shaping Early Language and Literacy Skills

NCT07103044
View directory record Official record
Conditions
Developmental Language Disorder
Interventions
Early Achievements - Shaping Early Language and Literacy Skills
Behavioral
Lead sponsor
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
Other
Eligibility
45 Months to 65 Months
Enrollment
360 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 4, 2025 · Synced Sep 5, 2026, 5:18 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Impact of Exogenous Ketones on Sleep and Breathing in Healthy Volunteers (K-SLEEP)

NCT07224074
View directory record Official record
Conditions
Healthy Participants, Sleep
Interventions
KETONE-IQ 20 grams (g), KETONE-IQ 40 grams (g)
Dietary Supplement
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 13, 2026 · Synced Sep 5, 2026, 5:18 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Evaluating Response to Vitamin D3 and K2 Supplementation in Healthcare Personnel

NCT07199829
View directory record Official record
Conditions
Hypovitaminosis D, Hypovitaminosis
Interventions
Vitamin Arm 1, Vitamin Arm 2, Vitamin Arm 3, Placebo
Dietary Supplement · Other
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 69 Years
Enrollment
96 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Sep 5, 2026, 5:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Comparative Study of Non-contact Tonometers for Intraocular Pressure and Corneal Cell Thickness Measurements

NCT02138279
View directory record Official record
Conditions
Intraocular Pressure, Corneal Pachymetry
Interventions
Not listed
Lead sponsor
Topcon Medical Systems, Inc.
Industry
Eligibility
18 Years and older
Enrollment
65 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Andover, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 7, 2022 · Synced Sep 5, 2026, 5:18 PM EDT
Completed No phase listed Interventional Accepts healthy volunteers Results available

Comparative Study of the NIDEK TONOREF III and the Haag-Streit Goldmann Manual Tonometer and Comparison of Pachymetry Values for NIDEK TONOREF III With the NIDEK CEM-530

NCT03441477
View directory record Official record
Conditions
Intraocular Pressure
Interventions
Nidek Tonoref III, Haag-Streit Goldmann Manual Tonometer, NIDEK CEM-530
Device
Lead sponsor
Nidek Co. LTD.
Industry
Eligibility
18 Years and older
Enrollment
225 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Andover, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 2, 2023 · Synced Sep 5, 2026, 5:18 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Melatonin-Micronutrients for Osteopenia Treatment Study

NCT01870115
View directory record Official record
Conditions
Osteoporosis, Osteopenia
Interventions
Fiber Pill, Melatonin, Strontium citrate, Vitamins D3 and K2
Dietary Supplement
Lead sponsor
Duquesne University
Other
Eligibility
Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2017
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 13, 2018 · Synced Sep 5, 2026, 5:18 PM EDT