Natural Factors Relief Biotic^® is a multi-strain formula featuring 7 billion colony forming units (cfu) of probiotics, including Lactobacillus, Bacillus, and Enterococcus strains shown to relieve some symptoms of irritable bowel syndrome (IBS). This innovative probiotic formula also helps reduce the risk of antibiotic-associated diarrhea and is shelf stable – no refrigeration required!