Yes. Certain probiotic strains, particularly Lactobacilli, can prevent recurrent yeast infections and urinary tract infections by:
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Lowering the pH of the vagina, making the environment unfavorable for harmful microbes
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Compete for space on the mucous membranes, making it more difficult for pathogens to attach
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Strengthen the body's local immune defense in the genital area
There are studies that show that women with Lactobacillus supplements often get fewer infections and if they do get an infection, they recover faster.