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Completed

NCT Number: NCT07265934

Impact of Supplementation of Probiotics and Grape Marc on Psychological Well-being of Healthy Adults

An open-label, baseline-controlled (pre-post) pilot study to assess the maintenance and/or improvement of both physical and mental well-being in subjects who daily consume either a food supplement or a functional food containing both the SYNBIO® probiotic blend and the dry grape marc extract. A target number of 40 healthy individuals will be recruited who meet the inclusion and exclusion criteria, who will be assessed upon enrollment and who have signed informed consent. Subjects will be randomly assigned to either the functional food or dietary supplement groups.

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Key information

Conditions

Healthy Participants

Age range

18 year–55 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Centro Universitario Sportivo, University of Camerino

Camerino, Macerata, 62032, Italy

About this study

The present clinical trial is a pilot open label, baseline-controlled (pre/post) experimental study, with a, a 2-week run-in period, 4-week intervention period and a further 2-week follow-up period without intervention to evaluate the potential prolonged effect of the functional products. Specifically, the supplementation should improve the parameters related to physical and mental well-being of subjects. Healthy adult participants were recruited and randomized into two treatment groups in a 1:1 ratio. Subjects will be randomly assigned to either the functional food or dietary supplement groups. The study will consist of three meetings at the coordinating center. The first visit will be for enrollment. Through an interview, the investigator will verify that the volunteer meets the inclusion criteria. The volunteer will receive an informed consent form to sign and the study protocol information sheet, which explains the study's progress in a simple and clear manner. The investigator will answer any questions and concerns the volunteer may have regarding the study. Subjects will be randomly assigned to either the functional food or dietary supplement group. Recruited subjects will be given questionnaires to complete independently. The second meeting will take place at the end of the month of taking the study products and will consist of the administration of the end-of-treatment questionnaires. The third and final meeting, two weeks after the end of treatment, will involve completing the questionnaires again to assess the possible persistence of the benefits that taking the products may have produced.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • men and women between 18 and 55 years;
  • healthy based on medical history;
  • commitment to comply with all study procedures;
  • have a moderate level of stress (score 13-20) based on the Cohen Perceived Stress Scale (PSS-10);
  • signing of informed consent.

Exclusion criteria

  • significant acute or chronic illnesses and/or an immunocompromised state
  • pregnant women who are breastfeeding or planning to become pregnant during the study period
  • subjects with clinically significant gastrointestinal tract disease, subjects with allergy or sensitivity to the active or inactive ingredients of the investigational product
  • subjects who had used antibiotics in the month prior to enrolment or who had used probiotics continuously in the two months prior to enrolment.

Treatment and study plan

Probiotic bars

Other

The functional bar contains two probiotic bacterial strains, Lacticaseibacillus rhamnosus IMC 501® and Lacticaseibacillus paracasei IMC 502® at a concentration of 10E9 live cells per gram in a 1:1 combination (SYNBIO, European patent EP 1743042) and 1% grape marc extract; Each participant received one box containing 30 bars, one bar per day for 4 weeks.

Probiotic capsules

Dietary Supplement

The dietary supplement consists of capsules containing two probiotic bacterial strains, Lacticaseibacillus rhamnosus IMC 501® and Lacticaseibacillus paracasei IMC 502® at a concentration of 10E9 live cells per gram in a 1:1 combination (SYNBIO, European patent EP 1743042) and 1% grape marc extract. Each participant received one bottle containing 30 capsules, one capsule per day for 4 weeks.

Primary outcomes

  1. Change in perceived stress levels

    Time frame: After 4 weeks consumption of the study product

    to evaluate the effect of the probiotic products on perceived stress levels measured using the Perceived Stress Scale (PSS). 5-point scale from 0 (never) to 4 (very often).

Secondary outcomes

  1. Assessment of sleep quality

    Time frame: After 4 week consumption of the study product

    To evaluate the sleep quality through the PSQI (Pittsburgh Sleep Quality Index) 4 weeks after consumption of the study product. 0-3 interval scale , global PSQI score (range 0-21), the lower the PSQI global score, the better the sleep quality.

  2. Assessment of sleep quality

    Time frame: After 2 weeks follow-up (week 6)

    To evaluate the sleep quality through the PSQI (Pittsburgh Sleep Quality Index) 2 weeks after the end of the study product consumption period. 0-3 interval scale , global PSQI score (range 0-21), the lower the PSQI global score, the better the sleep quality.

  3. Assessment of physical activity

    Time frame: After 4 weeks consumption of study product

    To evaluate the physical activity through the IPAQ (International Physical Activity Questionnaire) 4 week after consumption of the study product

  4. Assessment of physical activity

    Time frame: After 2 weeks follow-up (week 6)

    To evaluate physical activity through the IPAQ (International Physical Activity Questionnaire) 2 weeks after the end of the study product consumption period

  5. Changes on health-related quality of life

    Time frame: After 4 weeks consumption of the study product

    To evaluate changes on health-related quality of life through the GIQLI questionnaire 4 weeks after consumption of the study product. Scale from 0 to 4, a global score can be estimated that goes from 0 to 144. The higher the score, the better the result.

  6. Changes on health-related quality of life

    Time frame: After 2 weeks follow-up (week 6)

    To evaluate changes on health-related quality of life through the GIQLI questionnaire 2 weeks after the end of the study product consumption period. Scale from 0 to 4, a global score can be estimated that goes from 0 to 144. The higher the score, the better the result.

  7. Changes in quality of life

    Time frame: After 4 weeks consumption of the study product

    To evaluate changes in quality of life, assessed through the PGWBI questionnaire (The Psychologi-cal General Well-Being Index) 4 weeks after consumption of the study product. Score from 0 (severe stress) to 110 (well-being).

  8. Changes in quality of life

    Time frame: After 2 weeks follow-up (week 6)

    To evaluate changes in quality of life, assessed through the PGWBI questionnaire (The Psychologi-cal General Well-Being Index) 2 weeks after the end of the study product consumption period. Score from 0 (severe stress) to 110 (well-being).

  9. Changes in intestinal function

    Time frame: After 4 weeks consumption of the study product

    To evaluate changes in intestinal function assessed according to the Bristol Stool Form Scale 4 weeks after consumption of the study product

  10. Changes in intestinal function

    Time frame: After 2 weeks follow-up (week 6)

    To evaluate changes in intestinal function assessed according to the Bristol Stool Form Scale 2 weeks after the end of the study product consumption period

  11. Changes in gastrointestinal symptoms

    Time frame: After 4 weeks consumption of the study product

    To evaluate changes in gastrointestinal symptoms assessed through the GSRS questionnaire (Gastrointestinal Symptom Rating Scale) 4 weeks after consumption of the study product. Seven-point Likert scale, from no discomfort (score 1) to very severe discomfort (score 7).

  12. Changes in gastrointestinal symptoms

    Time frame: After 2 weeks follow-up (week 6)

    To evaluate changes in gastrointestinal symptoms assessed through the GSRS questionnaire (Gastrointestinal Symptom Rating Scale) 2 weeks after the end of the study product consumption period. Seven-point Likert scale, from no discomfort (score 1) to very severe discomfort (score 7).

  13. Change in perceived stress levels

    Time frame: After 2 weeks follow-up (week 6)

    To evaluate perceived stress levels measured using the Perceived Stress Scale (PSS) 2 weeks after the end of the study product consumption period. 5-point scale from 0 (never) to 4 (very often).

Sponsors and collaborators

Lead sponsor

Synbiotec Srl

Industry

Registry information

Official study title

Beneficial Effects of a Food Supplement in Capsule Form and a Functional Chocolate Bar, Both Containing SYNBIO® Probiotic Strains and Grape Marc Plant Extract, on Healthy Adults.

Acronym: Rescue-bio

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
Dec 5, 2025
Registry last updated
Dec 11, 2025

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.

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