Nature's Way. More potent daily probiotic formulated for adults ages 50+ with researched probiotic strains to support digestive, immune, and colon health.* 10 probiotic strains to support gut diversity PLUS prebiotics as a food source for good bacteria.* 50 billion live probiotic strains per capsule, including extra Bifidobacteria. Contains the doctor-preferred probiotic strain for regularity.* ** (**Based on an IQVIA ProVoice survey of Primary Care Physicians, HOWARU B. lactis HN019 is the Doctor preferred probiotic strain for Regularity as compared to other strains in leading Probiotic brands, 52-week sales MULO, ending 10/3/2021; November 2021.*) Delayed release vegetarian capsules. Each capsule is resistant to the harmful effects of stomach acid and distributes live cultures to the proper area of the small intestine and colon. No refrigeration required. Trusted quality. This product is Non-GMO Project Verified, DNA-Authenticated, and Certified Gluten-Free. No artificial colors.