What Your Gut Bacteria Do

The microbiome is not just along for the ride. It performs critical functions:

• Digestion - bacteria break down fibers and complex carbs that human enzymes cannot touch
• Vitamin production - gut bacteria help produce vitamin K, folate, and other nutrients
• Immune training - much of your immune system is shaped by microbial interactions in the gut
• Neurochemical regulation - gut-lining cells make most of the body's serotonin, and microbes help regulate that production.