A Phase 2 interventional study of Novel Herbal Cold & Flu Blend and Placebo in URTI and Common Cold, sponsored by RDC Clinical Pty Ltd. Not yet recruiting. Open to participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-06-11.
Sponsored by RDC Clinical Pty Ltd · Phase 2, Interventional, and Treatment
The aim of this study is to evaluate the efficacy of a Novel Herbal Cold \& Flu Blend in reducing the duration of symptoms of the common cold. The secondary objective is to assess whether the investigational product reduces the severity of symptoms. Participants will be enrolled for 16 weeks, during this period they will take the assigned study product when they experience URTI symptoms.
219 studies on the registry are indexed under Common Cold; 23 are open to participants now.
This study's planned enrollment of 300 is above the median of 150 across 184 interventional studies indexed under Common Cold.
Browse Common Cold studies →RDC Clinical Pty Ltd is the lead sponsor of 34 studies on the registry; 8 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Chronic obstructive pulmonary disease: long-term lung disease that makes it hard to breathe out, including emphysema and chronic bronchitis.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
COPD
Chronic obstructive pulmonary disease: long-term lung disease that makes it hard to breathe out, including emphysema and chronic bronchitis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Each 485mg capsule contains the Novel Herbal Cold \& Flu Blend. Participants will start taking the study product if they experience 2 or more URTI symptoms (as per the WURSS-24) or a fever above 38.0°C. Participants are to consume 2 capsules three times each day until symptoms resolve.
Dietary Supplement: Novel Herbal Cold & Flu Blend
Each placebo capsule contains Microcrystalline cellulose, Colloidal Silicon dioxide, Magnesium Stearate and Sodium Metabisulfite. Participants will start taking the study product if they experience 2 or more URTI symptoms (as per the WURSS-24) or a fever above 38.0°C. Participants are to consume 2 capsules three times each day until symptoms resolve.
Other: Placebo
Each 485mg capsule contains the Novel Herbal Cold \& Flu Blend. Participants will start taking the study product if they experience 2 or more URTI symptoms (as per the WURSS-24) or a fever above 38.0°C. Participants are to consume 2 capsules three times each day until symptoms resolve.
Each placebo capsule contains Microcrystalline cellulose, Colloidal Silicon dioxide, Magnesium Stearate and Sodium Metabisulfite. Participants will start taking the study product if they experience 2 or more URTI symptoms (as per the WURSS-24) or a fever above 38.0°C. Participants are to consume 2 capsules three times each day until symptoms resolve.
Cumulative number of days that participant recorded symptom positive on the WURSS-24 scoring system
Cumulative number of days that participant recorded symptom positive on the WURSS-24 scoring system
Time frame: Baseline to week 16
Symptom severity based on the total sum of all parameters in the WURSS-24 scoring system.
Change from baseline to the end of the Common Cold episode in Symptom severity based on the total sum of all parameters in the WURSS-24 scoring system.
Time frame: Baseline to week 16
Cumulative scores of each individual parameter in the Wisconsin Upper Respiratory Symptom Survey (WURSS-24) scoring system..
Change from baseline to the end of the Common Cold episode in Cumulative scores of each individual parameter in the Wisconsin Upper Respiratory Symptom Survey (WURSS-24) scoring system..
Time frame: Baseline to week 16
Number of days of absence from work / school.
Change from baseline to the end of the Common Cold episode in Number of days of absence from work / school.
Time frame: Baseline to week 16
Perception of efficacy rated on the Treatment Satisfaction VAS.
Change from baseline to the end of the Common Cold episode in Perception of efficacy rated on the Treatment Satisfaction VAS.
Time frame: Baseline to week 16
Safety via Adverse Event reporting and incident rate ratio between active and placebo groups
Change from baseline to the end of the Common Cold episode in Safety via Adverse Event reporting and incident rate ratio between active and placebo groups
Time frame: Baseline to week 16
Use of rescue medication for an URTI
Change from baseline to the end of the Common Cold episode in Use of rescue medication for an URTI e.g. Paracetamol, Ibuprofen.
Time frame: Baseline to week 16
Safety: Occurrence of adverse events and Serious Adverse Events
Occurrence of adverse events and Serious Adverse Events
Time frame: Baseline to week 16
No study locations are listed for this record.
Plan to share: Undecided
No publications or documents are linked to this record.
This study is not yet recruiting, as verified in May 2026. You cannot join it, but the record below documents what was studied.
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