OptiBac Probiotics \'For daily immunity\' has been created especially for those looking for natural immune support. It contains the extensively researched strain Lactobacillus paracasei CASEI 431 as well as vitamin C which helps to support your body\'s resistance to infection and supports a healthy immune system. Suggested for daily use each capsule provides 5 billion live microorganisms guaranteed.This supplement is researched and proven to survive through stomach acidity and reach the gut alive.