CanPrev' s Pro-Biotik 15B is a shelf-stable probiotic capsule formula containing five critical probiotic species naturally found in the human intestinal tract, including bifidobacteria and lactobacilli. Each species is represented at optimal levels to enhance the natural gut flora and provide a health benefit. Pro-Biotik 15B is completely shelf stable for ease of use anytime, anywhere, no refrigeration is required. At the time of manufacture, CanPrev' s Probiotics 15B contains forty billion CFU's (colony forming units, a measure of friendly bacteria activity). By the time it reaches its expiry date it is still guaranteed to have an activity level of 15 billion CFU's, now that's impressive! Keep a bottle of Probiotics 15B in your bag, knowing with confidence that you have a probiotic that works for you, wherever life takes you.