Beta-glucan boosts the immune system to prevent colds
6.0Moderate
evidence
evidence
The Claim
It is commonly believed that beta-glucan can enhance immune function so effectively that it prevents common colds and other infections.
Origin
This myth is perpetuated by supplement companies and media articles that emphasize beta-glucan's immunomodulatory effects without discussing the variability of results across studies.
What Science Says
Several RCTs have evaluated beta-glucan's effect on immune function, with some studies showing a reduction in cold incidence and severity. However, results are inconsistent, and not all studies demonstrate significant benefits. Meta-analytic reviews suggest a potential for modest immune support, but not outright prevention of colds.
Verdict
Misleading