Nature’s Bounty® Controlled Delivery Probiotic CD takes advantage of today’s nutritional scientific innovation with a targeted approach to digestive health.* We combined our exceptional probiotics with BIO-tract® technology. BIO-tract® technology is the process of enrobing our probiotics with a vegetarian gel-like substance that protects the ingredients from gastric acids. BIO-tract® technology allows the caplet to pass through the digestive tract, and release live organisms within the digestive system.