LC-Plasma for Preventing URTIs and Reducing Symptoms

March 4, 2026 updated by: RDC Clinical Pty Ltd

A Randomized Controlled Trial Evaluating the Efficacy of Lactococcus Lactis JCM 5805 (LC-Plasma) Lactic Acid Bacteria in Preventing Upper Respiratory Tract Infections and Reducing Symptom Severity and Duration

The goal of this study is to evaluate the efficacy of the LC-Plasma in preventing upper respiratory tract infections (URTIs) in healthy volunteers. Researchers will compare LC-Plasma to placebo to see if LC-Plasma prevents URTIs. Participants will take a tablet containing LC-Plasma or placebo daily for 24 weeks.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
637

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Australia
    • Queensland
      • Brisbane, Queensland, Australia, 4006
        • RDC Clinical

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Adults aged 18-60 years living in Australia
  • Individuals with a history of recurrent upper respiratory tract infections
  • Able to provide informed consent
  • Generally healthy
  • Agree to not participate in another clinical trial while enrolled in this trial
  • Agree to maintain their usual daily activities without significant changes. This includes not changing their current diet or stopping/starting a new exercise regimen during entire study period
  • Agree not to travel internationally for over 1 month in a single trip during the intervention period (baseline to study completion).
  • Females of childbearing potential must a prescribed form of birth control

Exclusion Criteria:

  • Serious illness e.g., liver disease, kidney disease, heart disease, mood disorders, neurological disorders such as multiple sclerosis.
  • Unstable illness e.g., changing medication/treatment.
  • BMI <18.5, >30
  • Current malignancy (excluding Basal Cell Carcinoma) or chemotherapy or radiotherapy treatment for malignancy within the previous 2 years.
  • Individuals with chronic respiratory conditions (e.g., asthma, chronic obstructive pulmonary disease).
  • Has current symptoms of an acute sickness.
  • Active smokers, nicotine use or drug (prescription or illegal substances) abuse
  • Current alcohol use (>14 alcoholic drinks week)
  • Allergic to any of the ingredients in the active or placebo formula
  • Pregnant or lactating woman
  • People medically prescribed medications within the last month that would affect the immune and/or the inflammatory response excluding topical steroid use.
  • Participants who are currently participating in any other clinical trial or who have participated in any other clinical trial during the past 1 month
  • Participants with cognitive damage
  • Participants with seasonal allergic rhinitis
  • Regular use of antihistamines
  • Individuals deemed unsuitable for participation by the Principal Investigator (PI) of this study.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: LC-Plasma
1 tablet containing 50mg LC-Plasma is taken daily for 24 weeks.
Dietary supplement: LC-Plasma
1 tablet containing 50mg LC-Plasma is taken daily for 24 weeks
Placebo Comparator: Placebo
1 tablet containing 50mg microcrystalline cellulose is taken daily for 24 weeks
Other: Placebo
1 tablet containing 50mg MCC is taken daily for 24 weeks

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Cumulative incidence number of URTIs
Time Frame: Day 1 to 24 weeks
Cumulative incidence number of Upper Respiratory Tract Infections (URTIs)
Day 1 to 24 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Cumulative number of infected participants
Time Frame: Day 1 to week 24
Cumulative number of infected participants
Day 1 to week 24
Cumulative number of days that participant recorded symptom positive to WURSS-24 system
Time Frame: Day 1 to week 24
Cumulative number of days that participant recorded symptom positive to WURSS-24 (Wisconsin Upper Respiratory Symptom Survey) scoring system during intervention period.
Day 1 to week 24
Cumulative scores of each parameter in WURSS-24 scoring system, as well as the total sum of all parameters for each participant.
Time Frame: Day 1 to week 24
Cumulative scores of each parameter in WURSS-24 scoring system during the intervention period, as well as the total sum of all parameters for each participant.
Day 1 to week 24
Length of URTI symptomatic days per one URTI episode.
Time Frame: Day 1 to week 24
Length of Upper Respiratory Tract Infection (URTI) symptomatic days per one URTI episode.
Day 1 to week 24

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Safety: Occurrence of adverse events and Serious Adverse Events
Time Frame: Day 1 to week 24
Occurrence of adverse events and Serious Adverse Events
Day 1 to week 24

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
RDC Clinical Pty Ltd

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Kirin Holdings Company, Limited

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Yusuke Ushida, Kirin Holdings Company, Limited
  • Study Director: Osamu Kanauchi, Kirin Holdings Company, Limited

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 28, 2025

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 10, 2026

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 10, 2026

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 10, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 10, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
February 14, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
March 6, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 4, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
February 1, 2025

More Information

Terms related to this study

Keywords

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • KURTIS

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

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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