Natren Megadophilus® is step one in Natren Probiotics easy-to-use three-step system for optimal internal wellness. Cultured with Lactobacillus acidophilus from super strain DDS-1, this high-potency probiotic product contains more than 2 billion cfu of viable live bacteria per serving size (1/2 tsp). The Lactobacillus acidophilus is surrounded by their growth medium (culturing substrate) packaged as loose powder in a bottle.