Shelf-Stable Support Probiotic Growth & Activity Fast-Acting Relief Dietary Supplement GMP - Good Manufacturing Practices - Produced in a Certified MRM's Probiotic Booster contains PreforPro, a fast-acting novel prebiotic that supports the growth of good bacteria without the drawbacks of other common prebiotics, such as gas or bloating. In only hours this can promote the growth and activity of beneficial bacteria in the small and large intestines. Probiotic Booster with PreforPro is designed to be used with any of MRM's probiotics for a synergistic effect. Works within only hours. Effective throughout the entire GI tract. Supports a wide variety of probiotics. Shelf-stable, no refrigeration needed.