- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03211767
Double-Blind, Randomized, Cross-Over Trial of Aged Garlic Extract for Hypertension
The primary objective of this trial is to assess the effect of consumption of aged garlic extract powder on 24 h systolic and diastolic ambulatory blood pressure in hypertensive individuals following 8 weeks of supplementation.
Additional secondary objectives are to assess the effects of aged garlic extract powder intake for 8 weeks on lipid profile (TC, HDL-C, LDL-C, and TG concentrations), blood glucose, office blood pressure, pulse-wave velocity and augmentation index, body mass index, and waist and hip circumference.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Forty hypertensive volunteers between 18 and 75 years will be recruited from the Winnipeg (Manitoba, Canada) area to participate in a two arm crossover, double-blind, randomized, placebo-controlled intervention study for 8 weeks per study period following obtainment of informed consent.
The 2 periods of treatment will include:
- Treatment period: One capsule twice a day, providing 600 mg each of aged garlic extract powder, for a total of 1200 mg/day of aged garlic extract powder.
- Control period: The control product will be an identical-looking placebo capsules containing cellulose, which is being used as a filler in the treatment capsules.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Manitoba
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Winnipeg, Manitoba, Canada, R3T 6C5
- Richardson Centre for Functional Foods and Nutraceuticals
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Ability to give written informed consent.
- Age: greater than or equal to 40 and less than or equal to 70 years.
- Systolic blood pressure140-160mmHg and/or diastolic blood pressure 90-100 mmHg
- LDL-C less than or equal to 4.9mmol/L
- Those on a stable dose of blood pressure lowering or lipid-lowering medication for greater than or equal to 3 months; if a participant chooses to stop taking blood pressure lowering medications, they will be required to have a minimum 3 month washout period prior to commencement of the study; all other medications medications will be permitted if they are on a stable dose before the start of the study
- Gender: Male and women who are not pregnant (determined by a negative urine pregnancy test at screening for women of childbearing potential) or lactating.
- Language: Participants must be able to read, write and speak English.
Exclusion Criteria:
- Systolic blood pressure > 160mmHg and/or diastolic blood pressure >100mmHg
- Those currently taking (or have taken within the last 3 months) lipid-lowering or blood pressure-lowering supplements (i.e., omega-3 supplements, plant sterols/stanols foods and/or supplements, fibre, etc.)
- Patients with unstable or serious illness, for example, dementia, terminal illness, recent bereavement, secondary hypertension, recent significant medical diagnosis.
- History of cancer, chronic illness, cardiovascular problems, liver and kidney disease (including chronic kidney disease (GFR < 60ml/min/1.732)), diabetes, inflammatory bowel disease, pancreatitis, gallbladder or biliary disease, neurological/psychological disease, bleeding disorders, experienced platelet abnormalities, macrovascular target organ damage (including cerebrovascular disease, stroke, hypertensive retinopathy, left ventricular dysfunction, angina pectoris, myocardial infarction, and peripheral artery disease)
- History of taking any type of garlic preparation (i.e., dried garlic homogenate, aged garlic extract, processed garlic capsule, time-released garlic powder tablet, regular garlic pill, garlic powder and garlic oil) in the past 6 months. in the past 3 months. (Note: regular garlic clove consumption as part of prepared meals, cooking preparations, etc. are permitted throughout the study period)
- Plan to consume any type of garlic preparation (i.e., dried garlic homogenate, aged garlic extract, processed garlic capsule, time-released garlic powder tablet, regular garlic pill, garlic powder and garlic oil. at any time during the study. (Note: regular garlic clove consumption as part of prepared meals, cooking preparations, etc. are permitted throughout the study period)
- Have gained or lost greater than or equal to 10lbs in the previous 3 months, or plan to lose weight at any time during the study
- Plan to become pregnant during the study period.
- Women of childbearing potential not using effective contraception which include: Hormonal contraceptives including combined oral contraceptives, hormone birth control patch, vaginal contraceptive ring, injectable contraceptives, or hormonal implants; Intrauterine devices (IUD) or Intrauterine system (IUS); Tubal ligation; Vasectomy of partner; Double barrier method (use of physical barrier by both partners, e.g. male condom and diaphragm, male condom and cervical cap)
- Consumption of more than 2 alcoholic drinks/day, or > 14 alcoholic beverages a week, or history of alcoholism or drug dependence.
- History of allergy to garlic, microcrystalline cellulose, silicon dioxide, magnesium stearate, gelatin, hydroxypropylcellulose, or caramel coloring
- Any planned surgeries any time during the study
- Taking medications with psychotropic properties for less than 3 months, i.e., those taking medications with psychotropic properties, such as anti-depressants, anti-anxiety, etc., at a stable consistent dose for a minimum of 3 months are eligible for the study, as long as the medication is consumed at a stable, consistent dose throughout the study period
- Smokers
- Exercising > 15 miles/wk or 4,000 kcal/wk
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Aged garlic extract
2 capsules per day containing aged garlic extract
|
Each capsule contains 600mg of aged garlic extract powder
|
Placebo Comparator: Placebo
2 capsules per day without aged garlic extract
|
Each capsule contains cellulose as a filler.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
24 hour ambulatory blood pressure
Time Frame: 8 weeks
|
8 weeks
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Waist circumference
Time Frame: 8 weeks
|
8 weeks
|
|
Blood total cholesterol
Time Frame: 8 weeks
|
8 weeks
|
|
Blood low-density lipoprotein cholesterol
Time Frame: 8 weeks
|
8 weeks
|
|
Blood high-density lipoprotein cholesterol
Time Frame: 8 weeks
|
8 weeks
|
|
Blood triglycerides
Time Frame: 8 weeks
|
8 weeks
|
|
Office blood pressure
Time Frame: 8 weeks
|
8 weeks
|
|
Pulse wave velocity
Time Frame: 8 weeks
|
Measured by Mobil-O-Graph
|
8 weeks
|
Augmentation index
Time Frame: 8 weeks
|
Measured by Mobil-O-Graph
|
8 weeks
|
Body mass index
Time Frame: 8 weeks
|
8 weeks
|
|
Hip circumference
Time Frame: 8 weeks
|
8 weeks
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Peter Jones, PhD, University of Manitoba
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- HS19581 (B2016:019)
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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