Natren Healthy Start Kit contains one bottle each of Natren's MegaDophilus Dairy, Bifido Factor Dairy, and Digesta-Lac Dairy: the three most beneficial bacteria for intestinal health. Works throughout the digestive system to maximize absorption, digestion, and regularity. MegaDophilus: Certified Organic For the small intestine, Megadophilus (Lactobacillus acidophilus DDS-1 super strain) contain bacteria that aid in digesting nutrients, processing of carbohydrates, and help support the body's natural ability to discourage yeast imbalance (candida). Bifido Factor: Certified Organic In the large intestine, Bifido Factor (Bifidobacterium bifidum) stimulates an environment which discourages harmful bacteria and yeasts by taking away their homes along the intestinal wall. B. bifidum bacteria produce lactic and acetic acids that help maintain a healthy intestinal system. B. bifidum bacteria produce B vitamins to help the large intestine process food naturally and efficiently. DigestaLac: Certified Organic Digesta-Lac (Lactobacillus bulgaricus LB-51 super strain) assists the body in digesting and absorbing food properly, promotes maximum digestion of carbohydrates and proteins, and has also been reported that L. bulgaricus bacteria promote healthy and natural elimination. Added benefits from natural supernatant (culturing medium) are maintained by Natren's proprietary Trenev Process.