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A study of the preventive effects of an Echinacea extract upon the occurrence of respiratory infections in healthy students

A randomised, placebo-controlled pilot trial of the preventive effects of thermally stabilised Echinacea purpurea extract upon upper respiratory tract infections in healthy students (aged 18-30 years)

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ISRCTN
Registry ID
ISRCTN16713057
Enrollment
60
Registered
2018-11-22
Start date
2000-12-01
Completion date
Unknown
Last updated
2021-05-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Upper respiratory tract infections Respiratory Upper respiratory tract infections

Interventions

Randomised dose allocation of trial or placebo tablets of same size and shape with their identities concealed from supervisors, investigators and participants until outcome data collected and entered

Sponsors

University of Wolverhampton
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: 1. Age: 18-30 years 2. Male or female 3. Occupation: student 4. Health status: healthy

Exclusion criteria

Exclusion criteria: 1. Gastro-intestinal (i.e., gut) ailments at the time of the study 2. Previous anaphylactic shock 3. Proneness to food allergies (specifically including sunflower seeds) 4. Severe eczema 5. Autoimmune disorders such as lupus or rheumatoid arthritis 6. Pregnant or breastfeeding

Design outcomes

Primary

MeasureTime frame
Incidence of illness and number of days of illness in each week - frequency of symptoms of infectious illness related to immunity (e.g., flu, cold, mouth ulcers) measured using appropriate scoring methods, and investigators monitor subjects' compliance and collect information regarding incidence/symptoms of infection weekly by pre-arranged telephone contact

Secondary

MeasureTime frame
1. Personal information of volunteer trial subjects (home living arrangements, sleeping habits, medications, supplement usage [including antioxidants], number of URTIs in preceding 12 months, stress, smoking, alcohol intake, exercise frequency), assessed using form completed by volunteer trial subject prior to start of dose-period (trial intervention) 2. Feelings of illness defined from list of URTI symptoms, recorded using weekly diary forms completed by SI for each of their 12 volunteer trial subjects by recording in daily tick-boxes (i.e., record of URTI incidence and days ill) weekly throughout the trial intervention 3. Missed doses, recorded using weekly diary forms completed by SI for each of their 12 volunteer trial subjects by recording in daily tick-boxes weekly throughout the trial intervention 4. Ill effects of the dose and where applicable symptoms, recorded using weekly diary forms completed by SI for each of their 12 volunteer trial subjects weekly throughout the trial intervention 5. Exercise frequency (minimum time-period per iteration 20 mins), recorded using weekly diary forms completed by SI for each of their 12 volunteer trial subjects by recording in daily tick-boxes weekly throughout the trial intervention 6. Doses taken, recorded using form with tick-boxes for each (dated) day of the trial completed by each of the 12 volunteer trial subjects daily throughout the trial intervention 7. Dietary intakes, recorded using diet diary of all the food and drink consumed completed by volunteer trial subjects over two 4-day periods in the 2nd and 7th weeks during the trial intervention 8. Subjective perceptions of subjects, recorded using follow-up questionnaire completed by each of the 12 volunteer trial subjects (including dose identity, benefit, side-effects) following the trial intervention

Countries

United Kingdom

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026