Ultimate Probiotic Formula The ultimate high potency, broad-spectrum probiotic formula, providing a 15 billion live cell count** of 13 species of beneficial cultures including soil-based probiotics called Homeostatic Soil Organisms. Supports normal intestinal comfort and function, and promotes healthy intestinal elimination regularity and consistency. Helps maintain a healthy, balanced immune system which is beneficial to overall health. Contains Bacillus subtilis to support healthy lactic acid bacteria (Bifidobacterium and/or Lactobacillus) count and healthy pH levels in the gut. The Saccharomyces boulardii in Primal Defense ULTRA nourishes intestinal mucosa cells to support the normal barrier function of the intestinal epithelium, the front line for the body's defense system. Delivered via UltraZorbe 100% vegetarian capsules to ensure potency, eliminate the need for fillers and binders, and provide quick nutrient release through faster dissolution into the body. Independent study suggests UltraZorbe capsules dissolve more completely than other vegetarian capsules.