Colonization, AsymptomaticPhase 1ProbioticsNCT07439978
Encapsulated Probiotics & Gut Microbiota
A Phase 1 study testing probiotic containing L.rhamnosus R0011 strain and 200 ml yogurt drink in people with Colonization, Asymptomatic and Colonisation, run by University College Dublin.
Trial summary
The aim of this study is to determine whether encapsulation of probiotic bacteria using natural plant protein can enhance bacterial colonisation. Lactobacillus rhamnosus is an ideal strain for the intervention, as it has been shown to affect overall gut health, gut-brain axis, and brain function. Read more about this study
- Who is it for?
- Ages 25 to 65 yearsHealthy volunteers can take part
- Conditions the study is for
- Colonization, Asymptomatic, Colonisation
- What is being tested?
- probiotic containing L.rhamnosus R0011 strain and 200 ml yogurt drink
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 50 participants
- Where
- No sites listed yet
- Study dates
- Apr 2026to Aug 2026
- Phase
- Phase 1
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 25 to 65 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Capacity to obtain and sign informed consent before any study-related procedure
- BMI range 18.5-31.9 kg/m2
- Willing to abstain from regular consumption of probiotic supplements or food products containing probiotic bacteria (including fermented food and beverages).
- Willing to abstain from regular consumption of supplements and medications known to alter gastrointestinal function or inflammatory status during the study.
Who cannot join
- Participants who meet any of the following criteria will be excluded:
- Smoking
- Substance abuse
- Pregnancy
- Diagnosis of type 1 and/or type 2 diabetes
- Current (or within the last 4 weeks prior to study start) use of probiotic supplementation.
Show all 19Show fewer
- Immobile (defined as the inability to participate in all study-related procedures)
- History of complicated gastrointestinal surgery
- Diagnosed with inflammatory bowel disease (IBD)
- Current diagnosis of psychiatric disease/s or syndromes
- Current diagnosis of neurodegenerative disease
- Systemic use of antibiotics and/or steroid medication in the last 4 months prior to inclusion
- Use of any non-steroidal anti-inflammatory drug (NSAID) more than 3 times a week for the last 2 months
- Consumption of any NSAID within 7 days of study start
- Any condition which could substantially interfere with intestinal barrier function (e.g. gluten sensitivity, lactose intolerance, celiac disease, IBS, IBD) or in any other way with the outcome of the study, as decided by the principal investigator's discretion
- Regular smoking, use of snuff, nicotine, cannabidiol narcotics/supplements, or e-cigarette use
- Drinking more than 9 standard cups of alcohol per week and/or more than 3 standard cups of alcohol per occasion
- Regular use, for more than three times a week for the last 2 months and/or 7 days prior to inclusion, of medications which, according to the principal investigator, can have an anti-inflammatory effect or affect in any way the intestinal barrier function or have an impact on the study analysis (such as laxatives, anti-diarrheal, anti-cholinergic, etc.)
- After being included in the study, starting any medication or treatment that could potentially influence the study participation and/or study analysis.
Trial locations and contacts
No sites are listed yet. Contact the study team or a site near you to ask about taking part.
About this study
Official title: A Physiological Study of a Fermented Yogurt Drink Containing Probiotics
The aim of this study is to determine whether encapsulation of probiotic bacteria using natural plant protein can enhance bacterial colonisation. Lactobacillus rhamnosus is an ideal strain for the intervention, as it has been shown to affect overall gut health, gut-brain axis, and brain function.
Twenty-five participants aged 25 to 65 years will be recruited and assessed on four occasions to compare the blood and faecal effects of a 28-day ingestion of a yoghurt beverage with and without the probiotic strain of interest. The study window will be 70+/13 days.
The current study will provide important information on the physiological function of probiotics in the small bowel. Understanding the underlying physiological effects of targeted probiotic delivery to the intestine and the impact on the microbiome is important for health outcomes.
Read the detailed description
The investigators plan to assess the gut microbiome and changes in probiotic diversity at the end of a course of a beverage containing encapsulated Lacticaseibacillus rhamnosus, compared to those at the end of a course of the same beverage without probiotics.
This is a randomised, double-blinded, placebo-controlled crossover study. Twenty-five healthy men and women with a body mass index (BMI) between 18.5-31.9 kg/m2, aged 25-65 years, will be recruited and randomised to a commercial fermented (yoghurt) drink containing a) encapsulated probiotics consisting of Lacticaseibacillus rhamnosus, or b) a non-probiotic fermented (yoghurt) dairy drink (control). The number of participants includes a 10% drop-out rate.
Each participant will be studied on four occasions in random order following a crossover design. Each will receive a 200 ml beverage containing yoghurt per day for 28 days, either a) fortified with 1 billion probiotics contained in pea protein capsules or b) the control beverage (same yoghurt without probiotic). Faecal samples will be collected on four occasions: at baseline, and at 28, 42 and 70 days after baseline.
The current study will provide important information on the physiological function of probiotics in metabolic and inflammatory biochemical parameters, as well as in their capacity to colonise the gastrointestinal tract.
- Conditions
- Colonization, Asymptomatic, Colonisation
- Being tested
- probiotic containing L.rhamnosus R0011 strain, 200 ml yogurt drink
- Keywords
- Probiotic, Microbiota, Colonization, Dairy
- Medical subject headings
- Asymptomatic Infections
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
probiotic containing L.rhamnosus R0011 strainBiological
Twenty-five participants will be studied on four occasions in random order and in a crossover design. Subjects will receive a daily dose of 200 ml on two different occasions for 28 days, a commercial dairy drink fortified with 1Billion probiotics in the pea protein capsules. Feacal samples will be collected on four occasions: at baseline, 28 days after baseline, 42 days and 70 days after baseline.
200 ml yogurt drinkDietary supplement
Twenty-five participants will be studied on four occasions in random order and in a crossover design. Subjects will receive a daily dose 200 ml on two different occasions for 28 days, a commercial dairy drink (no probiotics). Feacal samples will be collected on four occasions: at baseline, 28 days after baseline, 42 days and 70 days after baseline.
| Study group | Role | What they receive |
|---|---|---|
| Probiotic drink | Experimental | Encapsulated Lacticaseibacillus rhamnosus in 200 ml Yogurt drink Receives: Biological: probiotic containing L.rhamnosus R0011 strain |
| Placebo drink | Placebo comparator | 200 ml yogurt drink Receives: Dietary Supplement: 200 ml yogurt drink |
What is being measured
The primary outcome is the main question the study is designed to answer.
Colonisation
Faecal abundance of Lactobacillus rhamnosus after probiotic consumption measured through shotgun metagenomics -libraries with Illumina Nextera XT, sequenced 150 bp paired-end on NextSeq 2000. Negative + positive controls will be processed alongside study samples with around 15M paired reads/sample after quality controls.
Measured: 28 days
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted27 Feb 2026
- Study startApr 2026 (estimated)
- Primary completionJun 2026 (estimated)
- Study completionAug 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (23)Papers the sponsor has linked to this study.
- Other trials for Colonization, AsymptomaticStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Model description
- Each subject will be studied on four occasions in random order and in a crossover design. Subjects will receive a daily dose 200 ml on two different occasions for 28 days, either a) in a commercial dairy drink fortified with 1Billion probiotics in pea protein capsules or b) a commercial dairy drink (no probiotics). Feacal samples will be collected on four occasions: at baseline, 28 days, 42 days and 70 days after baseline.
- Masking
- Single blind
- Who is masked
- Participant
- Enrolment
- 50 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University College Dublin
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Carel Le Roux, PhD, Principal investigator, St Vincent's University Hospital, Ireland
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07439978
- Sponsor's protocol ID
- REF No. RS26-013
- Acronym
- Probiotics
- Status last verified
- Feb 2026
- First submitted
- 10 Feb 2026
- Last updated
- 8 May 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: This study will be carried out in a single center. Therefore, fecal samples sent for microbiota analysis and data for statistical analyses will be identified by numbers allocated in the protocol and not contain identifiable information.
Publications
Zhou JS, Shu Q, Rutherfurd KJ, Prasad J, Gopal PK, Gill HS. Acute oral toxicity and bacterial translocation studies on potentially probiotic strains of lactic acid bacteria. Food Chem Toxicol. 2000 Feb-Mar;38(2-3):153-61. doi: 10.1016/s0278-6915(99)00154-4.
PubMed 10717355Zhou JS, Shu Q, Rutherfurd KJ, Prasad J, Birtles MJ, Gopal PK, Gill HS. Safety assessment of potential probiotic lactic acid bacterial strains Lactobacillus rhamnosus HN001, Lb. acidophilus HN017, and Bifidobacterium lactis HN019 in BALB/c mice. Int J Food Microbiol. 2000 May 25;56(1):87-96. doi: 10.1016/s0168-1605(00)00219-1.
PubMed 10857928Zhou JS, Pillidge CJ, Gopal PK, Gill HS. Antibiotic susceptibility profiles of new probiotic Lactobacillus and Bifidobacterium strains. Int J Food Microbiol. 2005 Feb 1;98(2):211-7. doi: 10.1016/j.ijfoodmicro.2004.05.011.
PubMed 15681048Zheng Y, Yu Z, Zhang W, Sun T. Lactobacillus rhamnosus Probio-M9 Improves the Quality of Life in Stressed Adults by Gut Microbiota. Foods. 2021 Oct 8;10(10):2384. doi: 10.3390/foods10102384.
PubMed 34681433Zahr NM, Mayer D, Pfefferbaum A, Sullivan EV. Low striatal glutamate levels underlie cognitive decline in the elderly: evidence from in vivo molecular spectroscopy. Cereb Cortex. 2008 Oct;18(10):2241-50. doi: 10.1093/cercor/bhm250. Epub 2008 Jan 29.
PubMed 18234683Yao M, Xie J, Du H, McClements DJ, Xiao H, Li L. Progress in microencapsulation of probiotics: A review. Compr Rev Food Sci Food Saf. 2020 Mar;19(2):857-874. doi: 10.1111/1541-4337.12532. Epub 2020 Feb 11.
PubMed 33325164Wu D, Lewis ED, Pae M, Meydani SN. Nutritional Modulation of Immune Function: Analysis of Evidence, Mechanisms, and Clinical Relevance. Front Immunol. 2019 Jan 15;9:3160. doi: 10.3389/fimmu.2018.03160. eCollection 2018.
PubMed 30697214World Medical Association. World Medical Association Declaration of Helsinki: ethical principles for medical research involving human subjects. JAMA. 2013 Nov 27;310(20):2191-4. doi: 10.1001/jama.2013.281053. No abstract available.
PubMed 24141714Wickens KL, Barthow CA, Murphy R, Abels PR, Maude RM, Stone PR, Mitchell EA, Stanley TV, Purdie GL, Kang JM, Hood FE, Rowden JL, Barnes PK, Fitzharris PF, Crane J. Early pregnancy probiotic supplementation with Lactobacillus rhamnosus HN001 may reduce the prevalence of gestational diabetes mellitus: a randomised controlled trial. Br J Nutr. 2017 Mar;117(6):804-813. doi: 10.1017/S0007114517000289. Epub 2017 Apr 3.
PubMed 28367765Rode J, Edebol Carlman HMT, Konig J, Repsilber D, Hutchinson AN, Thunberg P, Andersson P, Persson J, Kiselev A, Lathrop Stern L, Salomon B, Mohammed AA, Labus JS, Brummer RJ. Probiotic Mixture Containing Lactobacillus helveticus, Bifidobacterium longum and Lactiplantibacillus plantarum Affects Brain Responses Toward an Emotional Task in Healthy Subjects: A Randomized Clinical Trial. Front Nutr. 2022 Apr 29;9:827182. doi: 10.3389/fnut.2022.827182. eCollection 2022.
PubMed 35571902Moro-Garcia MA, Alonso-Arias R, Baltadjieva M, Fernandez Benitez C, Fernandez Barrial MA, Diaz Ruisanchez E, Alonso Santos R, Alvarez Sanchez M, Saavedra Mijan J, Lopez-Larrea C. Oral supplementation with Lactobacillus delbrueckii subsp. bulgaricus 8481 enhances systemic immunity in elderly subjects. Age (Dordr). 2013 Aug;35(4):1311-26. doi: 10.1007/s11357-012-9434-6. Epub 2012 May 30.
PubMed 22645023Hutchinson AN, Bergh C, Kruger K, Susserova M, Allen J, Ameen S, Tingo L. The Effect of Probiotics on Health Outcomes in the Elderly: A Systematic Review of Randomized, Placebo-Controlled Studies. Microorganisms. 2021 Jun 21;9(6):1344. doi: 10.3390/microorganisms9061344.
PubMed 34205818Gbassi GK, Vandamme T. Probiotic encapsulation technology: from microencapsulation to release into the gut. Pharmaceutics. 2012 Feb 6;4(1):149-63. doi: 10.3390/pharmaceutics4010149.
PubMed 24300185Claesson MJ, Jeffery IB, Conde S, Power SE, O'Connor EM, Cusack S, Harris HM, Coakley M, Lakshminarayanan B, O'Sullivan O, Fitzgerald GF, Deane J, O'Connor M, Harnedy N, O'Connor K, O'Mahony D, van Sinderen D, Wallace M, Brennan L, Stanton C, Marchesi JR, Fitzgerald AP, Shanahan F, Hill C, Ross RP, O'Toole PW. Gut microbiota composition correlates with diet and health in the elderly. Nature. 2012 Aug 9;488(7410):178-84. doi: 10.1038/nature11319.
PubMed 22797518Hill C, Guarner F, Reid G, Gibson GR, Merenstein DJ, Pot B, Morelli L, Canani RB, Flint HJ, Salminen S, Calder PC, Sanders ME. Expert consensus document. The International Scientific Association for Probiotics and Prebiotics consensus statement on the scope and appropriate use of the term probiotic. Nat Rev Gastroenterol Hepatol. 2014 Aug;11(8):506-14. doi: 10.1038/nrgastro.2014.66. Epub 2014 Jun 10.
PubMed 24912386
Study at a glance
From the registry record, last updated by the sponsor on 8 May 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Physiological Study of a Fermented Yogurt Drink Containing Probiotics
- ClinicalTrials.gov ID
- NCT07439978
- Acronym / sponsor ID
- Probiotics / REF No. RS26-013
- Conditions
- Colonization, Asymptomatic, Colonisation
- Keywords
- Probiotic, Microbiota, Colonization, Dairy
- Phase
- Phase 1
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 50 participants (estimated)
- Lead sponsor
- University College DublinUniversity, hospital or other
- Study start
- Apr 2026 (estimated)
- Primary completion
- Jun 2026 (estimated)
- Study completion
- Aug 2026 (estimated)
- First posted
- 27 Feb 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The aim of this study is to determine whether encapsulation of probiotic bacteria using natural plant protein can enhance bacterial colonisation. Lactobacillus rhamnosus is an ideal strain for the intervention, as it has been shown to affect overall gut health, gut-brain axis, and brain function.
Twenty-five participants aged 25 to 65 years will be recruited and assessed on four occasions to compare the blood and faecal effects of a 28-day ingestion of a yoghurt beverage with and without the probiotic strain of interest. The study window will be 70+/13 days.
The current study will provide important information on the physiological function of probiotics in the small bowel. Understanding the underlying physiological effects of targeted probiotic delivery to the intestine and the impact on the microbiome is important for health outcomes.
Detailed description
The investigators plan to assess the gut microbiome and changes in probiotic diversity at the end of a course of a beverage containing encapsulated Lacticaseibacillus rhamnosus, compared to those at the end of a course of the same beverage without probiotics.
This is a randomised, double-blinded, placebo-controlled crossover study. Twenty-five healthy men and women with a body mass index (BMI) between 18.5-31.9 kg/m2, aged 25-65 years, will be recruited and randomised to a commercial fermented (yoghurt) drink containing a) encapsulated probiotics consisting of Lacticaseibacillus rhamnosus, or b) a non-probiotic fermented (yoghurt) dairy drink (control). The number of participants includes a 10% drop-out rate.
Each participant will be studied on four occasions in random order following a crossover design. Each will receive a 200 ml beverage containing yoghurt per day for 28 days, either a) fortified with 1 billion probiotics contained in pea protein capsules or b) the control beverage (same yoghurt without probiotic). Faecal samples will be collected on four occasions: at baseline, and at 28, 42 and 70 days after baseline.
The current study will provide important information on the physiological function of probiotics in metabolic and inflammatory biochemical parameters, as well as in their capacity to colonise the gastrointestinal tract.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Single blind (participant)
- Number of arms
- 2
- Model description
- Each subject will be studied on four occasions in random order and in a crossover design. Subjects will receive a daily dose 200 ml on two different occasions for 28 days, either a) in a commercial dairy drink fortified with 1Billion probiotics in pea protein capsules or b) a commercial dairy drink (no probiotics). Feacal samples will be collected on four occasions: at baseline, 28 days, 42 days and 70 days after baseline.
| Arm | Type | Receives |
|---|---|---|
| Probiotic drink | Experimental | Biological: probiotic containing L.rhamnosus R0011 strainEncapsulated Lacticaseibacillus rhamnosus in 200 ml Yogurt drink |
| Placebo drink | Placebo comparator | Dietary Supplement: 200 ml yogurt drink200 ml yogurt drink |
Who may qualify
- Ages
- 25 to 65 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Capacity to obtain and sign informed consent before any study-related procedure
- BMI range 18.5-31.9 kg/m2
- Willing to abstain from regular consumption of probiotic supplements or food products containing probiotic bacteria (including fermented food and beverages).
- Willing to abstain from regular consumption of supplements and medications known to alter gastrointestinal function or inflammatory status during the study.
Key exclusion criteria (19 listed)
- Smoking
- Substance abuse
- Pregnancy
- Diagnosis of type 1 and/or type 2 diabetes
- Current (or within the last 4 weeks prior to study start) use of probiotic supplementation.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| probiotic containing L.rhamnosus R0011 strainTwenty-five participants will be studied on four occasions in random order and in a crossover design. Subjects will receive a daily dose of 200 ml on two different occasions for 28 days, a commercial dairy drink fortified with 1Billion probiotics in the pea protein capsules. Feacal samples will be collected on four occasions: at baseline, 28 days after baseline, 42 days and 70 days after baseline. | Biological | Probiotic drink |
| 200 ml yogurt drinkTwenty-five participants will be studied on four occasions in random order and in a crossover design. Subjects will receive a daily dose 200 ml on two different occasions for 28 days, a commercial dairy drink (no probiotics). Feacal samples will be collected on four occasions: at baseline, 28 days after baseline, 42 days and 70 days after baseline. | Dietary supplement | Placebo drink |
Primary outcome
Colonisation
Time frame: 28 days
Faecal abundance of Lactobacillus rhamnosus after probiotic consumption measured through shotgun metagenomics -libraries with Illumina Nextera XT, sequenced 150 bp paired-end on NextSeq 2000. Negative + positive controls will be processed alongside study samples with around 15M paired reads/sample after quality controls.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 May 2026.
- Background: PubMed 10717355Zhou JS, Shu Q, Rutherfurd KJ, Prasad J, Gopal PK, Gill HS. Acute oral toxicity and bacterial translocation studies on potentially probiotic strains of lactic acid bacteria. Food Chem Toxicol. 2000 Feb-Mar;38(2-3):153-61. doi: 10.1016/s0278-6915(99)00154-4.
- Background: PubMed 10857928Zhou JS, Shu Q, Rutherfurd KJ, Prasad J, Birtles MJ, Gopal PK, Gill HS. Safety assessment of potential probiotic lactic acid bacterial strains Lactobacillus rhamnosus HN001, Lb. acidophilus HN017, and Bifidobacterium lactis HN019 in BALB/c mice. Int J Food Microbiol. 2000 May 25;56(1):87-96. doi: 10.1016/s0168-1605(00)00219-1.
- Background: PubMed 15681048Zhou JS, Pillidge CJ, Gopal PK, Gill HS. Antibiotic susceptibility profiles of new probiotic Lactobacillus and Bifidobacterium strains. Int J Food Microbiol. 2005 Feb 1;98(2):211-7. doi: 10.1016/j.ijfoodmicro.2004.05.011.
- Background: PubMed 34681433Zheng Y, Yu Z, Zhang W, Sun T. Lactobacillus rhamnosus Probio-M9 Improves the Quality of Life in Stressed Adults by Gut Microbiota. Foods. 2021 Oct 8;10(10):2384. doi: 10.3390/foods10102384.
- Background: PubMed 18234683Zahr NM, Mayer D, Pfefferbaum A, Sullivan EV. Low striatal glutamate levels underlie cognitive decline in the elderly: evidence from in vivo molecular spectroscopy. Cereb Cortex. 2008 Oct;18(10):2241-50. doi: 10.1093/cercor/bhm250. Epub 2008 Jan 29.
- Background: PubMed 33325164Yao M, Xie J, Du H, McClements DJ, Xiao H, Li L. Progress in microencapsulation of probiotics: A review. Compr Rev Food Sci Food Saf. 2020 Mar;19(2):857-874. doi: 10.1111/1541-4337.12532. Epub 2020 Feb 11.
- Background: PubMed 30697214Wu D, Lewis ED, Pae M, Meydani SN. Nutritional Modulation of Immune Function: Analysis of Evidence, Mechanisms, and Clinical Relevance. Front Immunol. 2019 Jan 15;9:3160. doi: 10.3389/fimmu.2018.03160. eCollection 2018.
- Background: PubMed 24141714World Medical Association. World Medical Association Declaration of Helsinki: ethical principles for medical research involving human subjects. JAMA. 2013 Nov 27;310(20):2191-4. doi: 10.1001/jama.2013.281053. No abstract available.
- Background: PubMed 28367765Wickens KL, Barthow CA, Murphy R, Abels PR, Maude RM, Stone PR, Mitchell EA, Stanley TV, Purdie GL, Kang JM, Hood FE, Rowden JL, Barnes PK, Fitzharris PF, Crane J. Early pregnancy probiotic supplementation with Lactobacillus rhamnosus HN001 may reduce the prevalence of gestational diabetes mellitus: a randomised controlled trial. Br J Nutr. 2017 Mar;117(6):804-813. doi: 10.1017/S0007114517000289. Epub 2017 Apr 3.
- Background: PubMed 35571902Rode J, Edebol Carlman HMT, Konig J, Repsilber D, Hutchinson AN, Thunberg P, Andersson P, Persson J, Kiselev A, Lathrop Stern L, Salomon B, Mohammed AA, Labus JS, Brummer RJ. Probiotic Mixture Containing Lactobacillus helveticus, Bifidobacterium longum and Lactiplantibacillus plantarum Affects Brain Responses Toward an Emotional Task in Healthy Subjects: A Randomized Clinical Trial. Front Nutr. 2022 Apr 29;9:827182. doi: 10.3389/fnut.2022.827182. eCollection 2022.
- Background: PubMed 22645023Moro-Garcia MA, Alonso-Arias R, Baltadjieva M, Fernandez Benitez C, Fernandez Barrial MA, Diaz Ruisanchez E, Alonso Santos R, Alvarez Sanchez M, Saavedra Mijan J, Lopez-Larrea C. Oral supplementation with Lactobacillus delbrueckii subsp. bulgaricus 8481 enhances systemic immunity in elderly subjects. Age (Dordr). 2013 Aug;35(4):1311-26. doi: 10.1007/s11357-012-9434-6. Epub 2012 May 30.
- Background: PubMed 34205818Hutchinson AN, Bergh C, Kruger K, Susserova M, Allen J, Ameen S, Tingo L. The Effect of Probiotics on Health Outcomes in the Elderly: A Systematic Review of Randomized, Placebo-Controlled Studies. Microorganisms. 2021 Jun 21;9(6):1344. doi: 10.3390/microorganisms9061344.
- Individual participant dataSharing planned: No. This study will be carried out in a single center. Therefore, fecal samples sent for microbiota analysis and data for statistical analyses will be identified by numbers allocated in the protocol and not contain identifiable information.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Carel Le Roux, PhD principal investigator
St Vincent's University Hospital, Ireland
Questions about this trial
What is this clinical trial studying?
A Phase 1 study testing probiotic containing L.rhamnosus R0011 strain and 200 ml yogurt drink in people with Colonization, Asymptomatic and Colonisation, run by University College Dublin.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 19 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 8 May 2026. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Werd Al-Najim, PhD (+353 0864117842, werd.al-najim@ucd.ie), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Colonisation (time frame: 28 days). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07439978, which also lists 23 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 May 2026.