Dietary Supplement. Highly Resilient Probiotic*. Bacillus Coagulans. 5 Billion Cells Source Naturals Duraflora is a beneficial probiotic that forms highly resilient structures that create a protective barrier around each cell and support healthy intestinal flora. Preliminary research indicates that these protective barriers survive a variety of adverse environmental conditions and can thrive in a wide pH range. The protective nature of Bacillus coagulans improves shelf stability of the product and viability of probiotic benefits.* Suitable for vegetarians and hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt,.