Dietary Supplement. 75 Billion CFUs. Clinically studied daily use formula with 75 billion active cultures. For those with the highest probiotic needs due to heightened intestinal issues. Restores beneficial bacteria important for optimal digestive and immune health.*. What are Probiotics? Probiotics work to keep a healthy balance of intestinal flora. They reduce the amount of harmful bacteria by replenishing and maintaining the "friendly" bacteria.* The depletion of beneficial bacteria can occur as a result of poor diet, taking certain antibiotics, stress.