Our USDA Made with Organic certified Probiotic Blend contains 6 clinically documented and acid-resistant strains to give a comprehensive mix of probiotic species for optimal digestive health, immune function, mood balance, hair & skin health, and pathogen fighting support (candida, yeast, bacterial and viral). Each serving contains 16 billion probiotics along with crucial prebiotics which serves as fuel for probiotics and helps the good bacteria thrive in your gut so your probiotics work smarter, not harder. Unlike most probiotics, this does not require refrigeration because it's freeze-dried!