Could a daily probiotic boost your immune defenses?

NCT ID NCT05632341

Completed Disease control Sponsor: Green Cross Wellbeing Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested a probiotic supplement called GCWB1176 in 100 adults with normal or slightly low white blood cell counts. Participants took either the supplement or a placebo daily for 8 weeks. Researchers measured changes in natural killer (NK) cell activity and other immune markers to see if the supplement could improve immune function.

What this could mean

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

Active substance: Lactococcus lactis (a probiotic supplement)
What this could lead to: If it works, this could point toward a simple daily supplement to help support the immune system, potentially reducing the frequency of common colds or infections.
What could go wrong: This is a small, early-stage trial with only 100 participants, and results may not apply to everyone. The supplement may show no significant benefit over placebo, and individual results can vary.

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

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As listed by the trial registrant

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

IMMUNE FUNCTION

Contacts and locations

Locations

Seoul St. Mary's Hospital, College of Medicine

Seoul, South Korea
St. Vincent's Hospital, College of Medicine

Suwon, South Korea

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