While some bacteria can cause illness, others—known as probiotics or friendly bacteria—are beneficial. These helpful microorganisms are found in foods like yogurt and miso and naturally live in our bodies. They can help support digestive health and maintain a healthy gut flora.

Good bacteria in the gut help digest food, absorb nutrients, and support immunity. However, these beneficial colonies can become depleted due to factors such as illness, poor diet, antibiotic use, digestive disorders, autoimmune conditions, and certain medications.