Adult 50+ Probiotic from Webber Naturals provides 15 billion active cells of 10 strains of probiotics to support a healthy gut microbiome in older adults. Evidence suggests that the diversity of gut flora diminishes with age, including key Bifidobacterium strains. This age-specific formula is tailor-made for older adults to help refresh gut microbiome and support gastrointestinal and immune function after the age of 50. Adult 50+ Probiotic is also shelf stable, so there is no need to refrigerate it.