The Effects of a Commercially Available Synbiotic on the Gut Microbiome and Cardiometabolic Health: A Randomized Double-Blind Placebo-Controlled Trial

The purpose of this study is to see the effect of 30 days of synbiotic vs. probiotic supplementation (usingJuice+ nutrition products) on body weight, metabolism, cardiovascular health, and gut health. This study will provide information for future studies and how such supplementation might influence health long term. You are being asked to participate because you are 18-60 years old, relatively healthy 1 or fewer risk factors for cardiovascular disease), and have been weight stable (weight within ±4.4 lbs) for at least 6 months.People who present with 2 or more cardiovascular disease risk factors (we will ask you this information) or have uncontrolled/overt cardiovascular, pulmonary, or metabolic disease (Diabetes Mellitus), or recent blood donation (<8 weeks) will not be able to participate. Those who have been diagnosed and/or are being treated for cancer will not be able to participate. Anyone recently (<1yr) diagnosed with an eating disorder is also not eligible to participate. Women who are currently pregnant, breastfeeding, attempting to conceive, or without a period will not be allowed to participate. Anyone who is being treated for hypothyroid with levothyroxine will be excluded as one of the supplement ingredients, chromium polynicotinate, may interfere with this medication. Given the focus of the study, those who are currently, or have recently used (<3 months), oral antibiotics or have diagnosed irritable bowel syndrome or gut/bowel maladies (short bowel syndrome, etc.) will be excluded Anyone with severe illness or compromised or suppressed immune system (e.g. taking immune suppressants, chronic viral infection or treatment) will be excluded. Please discuss any other potential food allergies with the research team, as food allergies will disqualify you from participating. About 48 people will take part in this research.

Study Overview

• Status: Completed
• Conditions: Hypertension; Gut Dysbiosis; Overweight , Obesity
• Intervention / Treatment: Dietary supplement: Synbiotic; Dietary supplement: Placebo

Detailed Description

Accordingly, the purpose of this study is to evaluate the efficacy of 1) supplementation with a novel Synbiotic (JuicePlus), or 2) placebo control over 30 days on the gut microbiome, cardiometabolic health, body weight, and body composition in healthy individuals.

Specific Aim 1. Explore the changes in the gut microbiome using 16s rRNA sequencing to determine total bacterial counts, microbial diversity (alpha- and beta-diversity), short chain fatty acid (SCFA) concentration, circulating inflammatory biomarkers and mucosal immunity as a result of a novel synbiotic vs. placebo control.

Specific Aim 2. Document the functional changes in cardiometabolic health-related parameters; specifically, heart rate, heart rate variability (HRV), blood pressure (central and peripheral), vascular stiffness (augmentation index, AIx, and pulse wave velocity, PWV), body weight and composition, blood glucose and lipids as a result of a novel synbiotic vs. placebo control.

Specific Aim 3. Characterize the impact of synbiotic vs. placebo control on perceptions of gut health (questionnaire), and mood states, given the gut-brain axis.

• Study Type: Interventional
• Enrollment (Actual): 47
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Utah
    • Cedar, Utah, United States, 84721
      • Southern Utah University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• To be included participants must be healthy, weight stable (± 4.4 lb for > 6 months prior), and 18 to 60 years of age. Participants will be expected to be relatively healthy without uncontrolled chronic disease (e.g. cardiovascular, metabolic, or pulmonary) and 2 or fewer positive risk factors for cardiovascular disease (e.g. high blood pressure, high cholesterol, etc.) as described by the American College of Sports Medicine/American Heart Association Criteria [18] and presented in the table 1 below. Participants will be screened for eligibility by a health history form (Appendix A) in person before baseline measurements are made (Figure 1). To ensure greater inclusion, ecological validity, and representation, women will be included in this study; however, we will not control for the menstrual cycle phase, but will document for possible statistical consideration.

Exclusion Criteria:

• Given the focus of the study, those who are currently, or have recently used (<3 months), oral antibiotics or have diagnosed irritable bowel syndrome or gut/bowel maladies (short bowel syndrome, etc.) will be excluded [19]. Subjects who present with more than 2 CVD risk factors (table above) or have uncontrolled/overt cardiovascular, pulmonary, or metabolic disease (Diabetes Mellitus), or recent blood donation (<8 weeks) will be excluded. Those who have cancer or are being treated for cancer will also be excluded. Women who are currently pregnant, breastfeeding, attempting to conceive, or amenorrheic (not associated with menopause or use of contraceptive medications) will also be excluded from the study. Anyone with severe illness or compromised or suppressed immune system (e.g. taking immunosuppressants, chronic viral infection or treatment) will be excluded [20]. Anyone recently diagnosed (<1yr) with an eating disorder will also be excluded. Finally, anyone with food allergies should be cautioned but those with known sensitivity to wheat, acacia gum, stevia, maltodextrin, or rice flour should not participate and will be excluded.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Treatment group; 30 day supplementation of synbiotic	Dietary supplement: Synbiotic; daily supplementation of snybiotic drink packet and capsule of multistrain probiotic
Placebo Comparator: Control group; 30 day supplementation of placebo	Dietary supplement: Placebo; daily placebo drink packet and capsule

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Gut microbiome diversity and total bacteria	Explore the changes in the gut microbiome using 16s rRNA sequencing to determine total bacterial counts, microbial diversity (alpha- and beta-diversity).	30 days
Blood biomarkers	Blood markers of short chain fatty acid (SCFA) concentration, circulating inflammatory biomarkers and mucosal immunity	30 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Hypertension	Assess changes in peripheral blood pressure via an oscillometric cuff	30 days

Collaborators and Investigators

• Sponsor: Southern Utah University

Study record dates

Study Major Dates

• Study Start (Actual): September 1, 2025
• Primary Completion (Actual): December 31, 2025
• Study Completion (Actual): December 31, 2025

Study Registration Dates

• First Submitted: March 31, 2026
• First Submitted That Met QC Criteria: March 31, 2026
• First Posted (Actual): April 7, 2026

Study Record Updates

• Last Update Posted (Actual): April 7, 2026
• Last Update Submitted That Met QC Criteria: March 31, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Vascular Diseases; Cardiovascular Diseases; Nutrition Disorders; Overnutrition; Body Weight; Pathological Conditions, Signs and Symptoms; Nutritional and Metabolic Diseases; Signs and Symptoms; Overweight; Obesity; Hypertension; Dietary Supplements; Food; Diet, Food, and Nutrition; Physiological Phenomena; Food and Beverages; Prebiotics; Probiotics; Synbiotics
• Other Study ID Numbers: 30-052025a

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No