Lactobacillus strains are common inhabitants of the normal gut flora and are often found in probiotic products.
From the sciencedaily.com
Some yogurts and other probiotic foods already attempt to take advantage of this beneficial gut flora to boost well-being in other ways.
From the healthland.time.com
Some probiotic supplements use the yeast S. boulardii to maintain and restore the natural flora in the gastrointestinal tract.
From the en.wikipedia.org
Good-quality probiotic supplements from health specialists can be combined with prebiotic foods such as garlic, onions, leeks and kale, which encourage growth of friendly flora.