Bacillus Subtilis
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A spore-forming bacterium used as a probiotic strain in supplements. Its spores are more heat- and acid-resistant than many other probiotic bacteria, which is part of why it is used in shelf-stable products.
Why it’s used
Taken with an interest in digestive comfort and general gut support.
What the evidence is for
digestive comfort in small, inconsistent trials.
What the evidence says
Human trials on Bacillus subtilis strains are fewer and smaller than those for more established probiotic species, and results on digestive symptoms are mixed. The overall evidence base is considered thin.
Context
Existing trials vary widely in strain, dose (measured in colony-forming units), and outcome measured, making it difficult to generalize findings across products.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.