Lactobacillus acidophilus

Lactobacillus acidophilus often colonizes the small intestine after passing gastric acid. It commonly secretes lactase that hydrolyzes lactose into glucose and galactose, reducing bloating, abdominal pain, and gas after milk or cheese. Lactose-digestion discomfort and upper-gut comfort are the most often matched felt effects; several continuous weeks make post-meal abdominal ease easier to notice. Unhydrolyzed lactose that reaches the colon is fermented to gas—the source of post-meal bloating.

It metabolizes to lactic acid, lowers local pH, and adheres to intestinal epithelium via surface proteins, occupying attachment sites of pathogens. Vaginal mucosa often maintains the same mild acidity; lactic acid helps hold the local environment. Felt effects usually fall on less bloating and mucosal comfort. Once the mucosal surface is occupied, transient microbes have a harder time settling and multiplying.