Doc Roy's GI Synbiotics 30 ml Gel Contains live (viable), naturally occurring microorganisms to maintain a healthy microbial balance in the dog's or cat's GI tract May be safely used in dogs and cats of all ages and stages Contains MOS, a unique ingredient to support the growth of good bacteria and help remove bad bacteria from the GI tract Recommended to minimize the potential for diarrhea and strengthen the dog's or cat's immune system