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Use of Carrageenan spray in the prevention of rhinovirus cold infection

A randomized placebo controlled trial of the preventative effects of Carrageenan nasal spray on reported cold infection symptoms and rhinovirus levels in the nose, when taken for 8 weeks by adults during cold season.

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12614000026628
Enrollment
100
Registered
2014-01-09
Start date
2014-04-10
Completion date
2015-06-09
Last updated
2020-01-13

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

Conditions

None listed

Brief summary

This is a pilot randomised control trial (RCT) to investigate whether using nasal Iota Carrageenan spray is protective against the development of colds caused by rhinovirus. The regular spraying of Iota Carrageenan may reduce the incidence of rhinovirus infections by blocking the binding of virus particles to nasal cells. If successful, the pilot study data will be used as the basis of a larger study to examine whether Iota Carrageenan can reduce rhinovirus infections among asthmatic adults.

Interventions

A nasal spray containing saline solution and 1.6 mg/ml carrageenan will be taken by participants in the active group during cold season. Each participant will take one spray into each nostril 3 times each day for 8 weeks. The participants will take a daily record of cold symptoms and a nasal swab will be taken at the beginning and end of the study, as well as when cold symptoms develop, to ascertain levels of rhinovirus in the nose.

Sponsors

Julian Crane
Lead SponsorIndividual

Study design

Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Prevention
Masking
Blinded (masking used) (Subject, Caregiver, Outcomes Assessor)

Eligibility

Sex/Gender
All
Age
18 Years to 60 Years
Healthy volunteers
Yes

Inclusion criteria

At least one cold infection reported in the previous year

Exclusion criteria

Not using any other nasal sprays during the study period Previous sensitivity to carrageenan spray.

Outcome results

None listed

Source: ANZCTR · Data processed: Feb 4, 2026