According to Jetson, the gut is the control center of the body and its mission is to simplify health. 70% of the immune system and 90% of serotonin live in the gut, which is why staying healthy is vital. Jetson Probiotics changes its formula every season to expose your gut to a range of strains and keep it as healthy as possible. We use clinically proven strains that are always fresh and delivered straight to your home.