How do probiotics support the immune system?

Numerous studies have demonstrated that probiotics supplements that include strains of Lactobacillus and Bifidobacteria, can help support the immune system and reduce the risk of infections, such as respiratory infections (cold, flu) and ear infections. There are several ways in which probiotics do this. They enhance the innate immune system and modulate inflammation; they compete with and block harmful bacteria from adhering to the cells in the digestive tract; they enhance the gut barrier and they stimulate the protective immune responses from the gut. There is also evidence that Lactobacillus probiotics may enhance the protective effects of vaccination against influenza, basically boosting the efficacy of the flu shot.

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