\"Udo’s Choice Adult’s Blend Microbiotics contains 6 adult-specific bacterial strains at an appropriate strength, designed specifically to reflect healthy adult digestive microflora (gut bacteria). An adult’s healthy microflora will closely resemble that of a child but due to their larger size, an adult needs much greater quantities of the same bacteria. Each strain has been specifically chosen for it\'s role in digestive tract health and the balance of strains has been carefully tested to work in harmony together.All formula\'s are tested and guaranteed to survive stomach acidity. Ideal for travel - refrigeration ensures maximum potency and stability. However adults blend can be left unrefrigerated for short periods of time\"