Yes, tempeh is a probiotic food because it contains bacteria that are beneficial to the human digestive system. It's considered a living culture, so you might notice that its packaging includes air to allow the culture to continue to grow. Once all the oxygen is used up, the culture will stop growing. The main bacteria in tempeh is Rhizopus Oryzae. Tempeh also produces a natural antibiotic that inhibits the growth of harmful bacteria in the body.