New! Supports the bod's natural immunity. 1 billion CFU. No water needed. Natrol Immune-Biotic is a convenient new way to support your immune system and digestive health at home or on-the-go. The great-tasting orange flavored quick dissolve packets contain a combination of prebiotics and probiotics with clinically supported Bacillus subtilis DE111. Immune support never tasted so good Natrol. Immune-Biotic is a convenient and delicious new way to support your immune and digestive health.