You can and should enjoy foods naturally rich with beneficial yeast and bacteria, like raw cultured vegetables, coconut kefir, and other fermented foods. (mindbodygreen.com)
Kefir is fermented milk made by using kefir grains containing beneficial yeast as well as probiotic bacteria found in the yoghurt. (get-gorgeous.com)
Here is a list of the 30 + strains of probiotics and beneficial yeasts in properly fermented kefir, according to the Journal Food Microbiology. (thehealthyhomeeconomist.com)