Seniors generally need a large quantity of beneficial bacteria and several varieties of bifidobacteria for optimum bowel health. High concentrations of acidophilus in the absence of bifidobacteria may tend to constipate. This formula has been specifically designed with an emphasis on the particular bifido strains necessary for health and longevity in seniors. This blend is also indicated for adults under age 65 who are experiencing lower bowel symptoms such as chronic diarrhea &/or constipation, often indicators of more serious conditions. The specific strains used in Advanced Adult's blend have been specially chosen for their value to lower bowel health and have been formulated to the appropriate viable count.