What is the ruling on eating food that contains microorganisms whose origin is unknown?

The basic principle regarding foods and drinks is permissibility, except for what has been explicitly forbidden by religious law, based on the Almighty’s saying: "He it is Who created for you all that is in the earth" (Al-Baqarah/29), and His saying: "O mankind, eat from what is on earth [that is] lawful and good" (Al-Baqarah/168). Accordingly, consuming foods containing beneficial bacteria, such as those found in milk, is permissible as long as they are not harmful to the body or mind.