Evidence supporting the use of: Bacillus subtilis natto
For the health condition: Colds (antiviral)

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Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Bacillus subtilis natto has a long history of use in traditional Japanese medicine, primarily as a probiotic and for general immune support rather than as a direct treatment for colds or viral infections. Natto, the fermented soybean product containing B. subtilis natto, has been consumed for centuries for its perceived health benefits, which include supporting digestion and overall immune system function. Folk medicine traditions sometimes suggest that a healthy gut flora, bolstered by probiotics like B. subtilis natto, may help the body resist infections, including common colds. However, there is minimal direct traditional evidence for using B. subtilis natto specifically as an antiviral or to treat colds.

From a scientific standpoint, while there is emerging interest in the immunomodulatory effects of certain probiotics, including B. subtilis strains, high-quality clinical trials specifically demonstrating efficacy against cold viruses or direct antiviral effects in humans are lacking. Some in vitro and animal studies suggest potential immune benefits or modulation, but these do not translate into strong clinical recommendations. Therefore, the traditional use as an immune tonic exists, but scientific validation for antiviral or anti-cold effects is weak and indirect.

More about Bacillus subtilis natto
More about Colds (antiviral)

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Products containing Bacillus subtilis natto

We currently have no products on Caring Sunshine that contain this ingredient.