Spirulina extract shows promise in strengthening immune defenses against viruses
NCT ID NCT05447078
First seen Jan 11, 2026 · Last updated Jun 21, 2026 · Updated 23 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.
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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University of Mississippi Medical Center
Jackson, Mississippi, 39216, United States
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.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.