How does lactobacillus help the digestive system?

Answer 1

bacteria begin to colonise the gut soon after birth, they play a key role in training the immune system to recognise pathogenic and non-pathogenic bacteria. Just having the bacteria there prevents other pathogenic species from taking up the same space and so prevents some diseases. They also produce some vitamins notably biotin and vitamin K and some ferment carbohydrate foods which we could not other wise digest turning them in to short chain fatty acids.

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Answer 2

it produces lactase which digests milk sugars

it facilitates the enzymatic cleavage of milk proteins such as casein into amino acids and ammonia