Prebiotics by Life Extension. Details:You want your gut-friendly bacteria to flourish. Why? Because keeping a healthy balance of probiotics in our digestive system is essential for immune and whole-body health. Our FLORASSIST GI with Phage Technology formula combines a blend of seven probiotic strains that replenish the beneficial bacteria in your gut, helping you better absorb the nutrients from the foods you eat. It also targets unwanted bacteria with a combination of four bacteriophages.