We are not alone. On any given day, we’re in the company of 100 trillion bacteria living in our gut. From our mouth to our bottom end, microbiota, a helpful type of bacteria commonly called “gut flora,” populate our digestive tract, synthesizing vitamins B and K, producing energy, training the immune system to respond to pathogens and protecting against certain diseases. Probiotics are a culture of these “good” bacteria, and the term probiotics can be used when referring to foods or supplements that...
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