Spirulina extract shows promise in strengthening immune defenses against viruses

NCT ID NCT05447078

Completed Disease control Sponsor: University of Mississippi Medical Center Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jul 31, 2026 · Updated 2 times

Summary

This study tested whether a daily supplement called Immulina, made from Spirulina, can help healthy people fight off upper respiratory viruses like the flu. Researchers measured natural killer cell activity and other immune markers in 492 healthy adults aged 18-59 and 65+. Participants took either Immulina or a placebo for 20 weeks to see if the supplement boosted their immune resilience.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Immulina (Spirulina extract)
What this could lead to: If it works, this could support using Spirulina extract as a dietary supplement to strengthen the immune system against common colds and flu.
What could go wrong: This is a completed Phase 3 trial, but results are not yet published. The supplement may show no significant benefit over placebo, and individual responses can vary.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

influenza

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

HEALTHY VOLUNTEERS

Contacts and locations

Locations

University of Mississippi Medical Center

Jackson, Mississippi, 39216, United States

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