Wellness starts with a healthy gut. Nature's Way Fortify Optima Ultra Potency 100 Billion Probiotic is a daily advanced care probiotic supplement formulated with 16 diverse probiotic strains to support gut comfort and digestive and immune health. With 100 billion live probiotic cultures per capsule. Reduces occasional constipation, gas and digestive discomfort. With plant-based prebiotic fiber, food for good bacteria. Fortify contains the doctor-preferred probiotic strain for regularity and is Non-GMO Project Verified, Certified Gluten-Free.