Dr Q's Probiotic Maximum Strength is a vegetarian, dairy- and gluten-free, four strain probiotic totaling 100 billion CFU per capsule. Each vegetarian capsule is sealed in nitrogen-purged aluminum blister packs to serve as protection from factors proven to compromise the stability of probiotics such as heat, moisture, and oxygen. Dr Q's Probiotic Maximum Strength provides four researched strains of beneficial bacteria, including the extensively studied HN019 strain of Bifidobacterium lactis. These live microorganisms have proven health benefits and well-established safety, and have been tested for epithelial cell adhesion and/or resistance to low pH.