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NCT Number: NCT06834984

Ritual Synbiotic+, a Dietary Supplement Designed to Impact Gastrointestinal Health, Mood, and Behavior in Women

The aim of this study is to determine how regular consumption of Synbiotic+, a dietary supplement that contains prebiotics, probiotics, and postbiotics, impacts functional gastrointestinal health, markers of intestinal inflammation and immune health, and influences mood and behavior. The primary outcome will be to assess gastrointestinal health using bowel movement tracking, self-report and objective assessments of gastrointestinal symptom severity, stool levels of short chain fatty acids, changes in the gut microbiota, including recovery of LGG and BB-12, and functional measures of the microbiome. Secondary outcomes will include stool and blood markers of gut barrier function and intestinal inflammation, immune health, and self-assessments of stress, anxiety, sleep, and quality of life.

Active, Not Recruiting

This study is active but is not currently recruiting participants.

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Key information

Conditions

Gastrointestinal Disease Symptoms

Age range

25 year–65 year

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

Colorado State University Food and Nutrition Clinical Research Laboratory

Fort Collins, Colorado, 80523, United States

About this study

The trial will be a double-blinded, randomized, placebo-controlled parallel arm intervention study taking place at Colorado State University. In total, ~100 adult women (25-65 years old) with a BMI <30, with moderate digestive discomfort (as evidenced by a moderate score on a functional gastrointestinal questionnaire will be enrolled into the study. With an estimated 20% attrition rate, this will allow approximately 80 individuals to complete the study. Exclusion criteria include a BMI>30, any significant systemic diseases (including Crohn's, Ulcerative Colitis, but not including diagnosis of Irritable Bowel Syndrome), prescription medication for digestive symptoms, antibiotic or probiotic ingestion within the two months before entry into the study, and pregnancy or breastfeeding. Subjects will be provided with the consent form prior to the baseline visit and informed consent will be obtained prior to participating in the study. Participants will be compensated for their participation. Medical health history will be collected at the baseline visit. Quality of Life (QOL) and GI Health questionnaires, along with questionnaires to gauge mood and anxiety, will be collected from each enrolled participant at the baseline, mid-point ("check-in visit 2"), and final clinic visits; a GI health questionnaire will also be collected at the acute study visit (48-72 hours after treatment start). Anthropometric measures at the baseline visit will include seated blood pressure, height, weight, and waist:hip measurements; blood pressure will also be collected at the final visit. A stool sample will be collected from participants at each clinic visit, and a blood sample will be collected at the baseline and final clinical visits. Two 3-day diet records will be completed prior to the start and at completion of the study. In addition, participants will keep a daily record of their bowel movements and brief notes regarding any GI symptoms starting 7-days prior to beginning the treatment and for the duration of the study.

All enrolled participants will start with a baseline clinic visit and a 7-day lead in period, after which they will take one of the treatments for 12 weeks. To determine the acute effects of the treatment, participants will return a stool sample to the clinic 48-72 hours after the treatment start to establish acute effects (ie. changes in SCFA, microbial dysbiosis index). Subjects will randomly be assigned to a starting treatment (A or B) and capsules will be blinded and labeled by Ritual personnel who are not directly involved in the study. CSU clinical personnel will not be provided with the code for treatment groups until after all data analysis has been completed.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy adult women (age 25-65, with target average age of 50).
  • BMI <30.
  • with moderate gastrointestinal symptoms.
  • Participants should be willing to follow the study protocol and attend clinic visits.

Exclusion criteria

  • less than 25 years of age or greater than 65 years of age.
  • have a BMI >30.
  • taken antibiotics within two months or any probiotic supplements within the past 14 days prior to the start of treatment.
  • current medications and dietary supplements will be assessed on a case-by- case basis and will result in exclusion if there is the possibility that the drugs or supplements used would influence the endpoints of the study. This would include statins, metformin, NSAIDs, MAO inhibitors, and hormone therapies.
  • Individuals with current disease diagnosis, including diagnosis of cancer, liver or kidney disease, gastrointestinal diseases, and cardiometabolic disorders (cardiovascular disease, diabetes, etc.)
  • pregnant and breastfeeding people.
  • overuse of alcohol as determined on a case-by-case self-reported alcohol use.
  • if the individual feels they are unable to adhere to the study requirements, which includes consuming capsules, providing stool or blood samples, tracking bowel movements and symptoms, and attending scheduled clinic visits.

Treatment and study plan

Prebiotic, probiotic, postbiotic combination

Dietary Supplement

The product consists of two probiotics, Lactobacillus rhamnosus LGG and Bifidibacterium animalis subsp. lactis BB-12, supplied at a total concentration of 11B CFU's, a prebiotic consisting of 1 × 106 Plaque Forming Units (PFU) LH01-Myoviridae, LL5-Siphoviridae, T4D-Myoviridae, and LL12-Myoviridae bacteriophages, marketed as PreforPro, and tributyrin- a stale form of butyrate

Placebo

Dietary Supplement

Placebo pill containing stomach acid-resistant outer vegan capsule (hypromellose, gellan gum), hi oleic safflower oil, inner vegan capsule (hypromellose, gellan gum) microcrystalline cellulose, ascorbyl palmitate, silica

Primary outcomes

  1. Short Chain Fatty Acid concentration in stool

    Time frame: 4X: baseline, acute (3 days), mid-point (6 weeks), final (12 weeks).

    Gas chromatography will be used to measure changes in SCFA production in stool.

  2. Fecal pH

    Time frame: 4X: baseline, acute (3 days), mid-point (6 weeks), final (12 weeks).

    Stool sample pH will be measured before and after treatment.

  3. Fermentation Rate of microbiome

    Time frame: 4X: baseline, acute (3 days), mid-point (6 weeks), final (12 weeks).

    This is a functional measure of the microbiome and will be measured ex-vivo Radio Frequency Identification (RFID) system. Stool sample microbes will be assessed for fermentation rates.

  4. Microbial composition (alpha and beta diversity, dysbiosis index, differential taxa)

    Time frame: 2X: baseline, and final (12 weeks)

    Changes in microbiota profiles, ratio of pro-inflammatory to beneficial microbes, recovery of LGG & BB-12 in stool; measured using 16s rRNA and targeted assays.

  5. Total number and types of bowel movements

    Time frame: Daily for 12 weeks

    Defecation frequency and proportion of abnormal to normal bowel movements as recorded in a diary using the Bristol Stool Form Scale. The scale runs from 1-7 with healthier outcomes associated with 3-5 on the Bristol scale.

  6. Gastrointestinal Symptom Rating Scale

    Time frame: 4X: baseline, acute (3 days), mid-point (6 weeks), final (12 weeks).

    Measures Abdominal Pain Heartburn Acid Regurgitation Sucking Sensations in the Epigastrium Nausea & Vomiting Borborygmus (rumbling) Abdominal Distension (bloating) Eructation (burping) Flatus (gas) Decreased or Increased Passage of Stools Loose or Hard Stools Urgent Need for Defecation Feeling of Incomplete Evacuation Rated on a scale starting at "No Discomfort at all" to "Very severe discomfort", where better outcomes are associated with "No Discomfort At All" while worse outcomes are associated near(er) to "Very Severe Discomfort".

Secondary outcomes

  1. Fecal calprotectin

    Time frame: 3X: baseline, mid-point (6 weeks), final (12 weeks)

    Intestinal inflammation

  2. Alpha-1 antitrypsin

    Time frame: 3X: baseline, mid-point (6 weeks), final (12 weeks)

    Gut permeability

  3. Lipopolysaccharide binding protein and soluble CD14 in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Barrier function: Lipopolysaccharide binding protein and soluble CD14 are involved in binding LPS and initiating systemic inflammatory cascades and have been used as a proxy for gut barrier function.

  4. Human high sensitivity T-cell panel/Peripheral blood mononuclear cells (PBMCs)

    Time frame: 2X: baseline, and final (12 weeks)

    Immune health: in supernatants from LPS-stimulated PBMC; uses Milliplex MAP

  5. Alpha-1 antitrypsin in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Gut permeability/malabsorption

  6. Cortisol blood levels

    Time frame: 2X: baseline, and final (12 weeks)

    Cortisol levels

  7. GLP-1

    Time frame: 2X: baseline, and final (12 weeks)

    GLP-1 levels, metabolic health, measured with ELISA assay.

  8. Quality of Life as measured by Inflammatory Bowel Disease (IBD) Specific Quality of Life survey

    Time frame: 3X: baseline, mid-point (6 weeks), final (12 weeks)

    Online Survey measuring Helplessness, Embarrassment, Vulnerability, Discomfort, Enjoyment of Life, Body Image, Depression, Isolation, Behavior Change, Anger, and Irritability in regards to bowel problems.

    Survey scale starts at "not at all" and goes up to "extremely" with healthier outcomes associated with "not at all".

  9. Generalized Anxiety Disorder 7 Item Survey

    Time frame: 3X: baseline, mid-point (6 weeks), final (12 weeks)

    The GAD-7 (Generalized Anxiety Disorder-7) is a self-report questionnaire designed to screen for generalized anxiety disorder (GAD) and assess the severity of anxiety symptoms in individuals. It consists of 7 questions that focus on the frequency of anxiety-related symptoms experienced over the past two weeks.

    Scoring:

    0-4: Minimal or no anxiety 5-9: Mild anxiety 10-14: Moderate anxiety 15-21: Severe anxiety

  10. Positive and Negative Affect Schedule

    Time frame: 3X: baseline, mid-point (6 weeks), final (12 weeks)

    Subjective experience of mood (how you feel on average) rated on a scale from "very slightly or none at all" to "extremely". Moods can be positive (e.g inspiration) or negative (e.g. guilty), so the score does not reflect a better or worse outcome.

  11. Perceived Stress Scale

    Time frame: 3X: baseline, mid-point (6 weeks), final (12 weeks)

    Subjective experiences of stress. The questions in this scale ask about your feelings and thoughts during the last month. In each case, you will be asked to indicate how often you felt or thought a certain way. The scale ranges from "never" to "very often". Questions are regarding positive and negative situations, so a total score is not indicative of a better or worse outcome.

  12. Ritual Marketing Interest measuring the user experience of the probiotic supplement.

    Time frame: 3X: baseline, mid-point (6 weeks), final (12 weeks)

    Subjective experiences regarding smell, taste, ingestion, tolerability, nausea, burping, after taking the product. Also asks whether the participant would recommend the product, enjoyed the overall experience, easy to incorporate into daily routine, whether it improved skin and/or stomach discomfort.

    The survey uses a Likert Scale for all questions. Each question is situational in that the lower score, "Strongly Disagree" or the higher score "Strongly Agree" do not correlate as a "better" or "worse" outcome across all questions.

  13. Blood Glucose levels

    Time frame: 2X: baseline, final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  14. Alanine Aminotransferase (ALT) in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  15. Aspartate Aminotransferase (AST) in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  16. Alkaline Phosphatase (ALP) in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  17. Blood Creatinine

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  18. Blood bilirubin

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  19. Total Cholesterol

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  20. High Density Lipoprotein (HDL) in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  21. Blood Triglycerides

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  22. Non-HDL Cholesterol (nHDLc)

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  23. Total Cholesterol to HDL ratio (TC/H) in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  24. Low Density Lipoprotein (LDL) in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

  25. Very low density lipoprotein (VLDL) in blood

    Time frame: 2X: baseline, and final (12 weeks)

    Measured with a point of care instrument (Piccolo Express) using a disc-based photometric analysis.

Sponsors and collaborators

Lead sponsor

Colorado State University

Other

Collaborators

  • Ritual

Registry information

Official study title

Ritual Synbiotic+, a Dietary Supplement

Acronym: SYN

Important dates

Study start
2025
Primary completion
2026
Study completion
2026
First posted
Feb 19, 2025
Registry last updated
Jun 24, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.