Bacteria • Ad-Free

Your body hosts trillions of bacteria that help digest food, produce vitamins (like B and K), and train your immune system.

Tail-like structures for swimming and hair-like structures for sticking to surfaces. 2. The Good: Essential Life Support bacteria

We use bacteria to make food (yogurt, cheese, sauerkraut), treat sewage, and even produce medicines like insulin. 3. The Bad: Pathogens Your body hosts trillions of bacteria that help