1. The official definition of probiotics is: oral probiotics refer to living microorganisms that can play a healthy role beyond the basic inherent nutrients through a certain amount of digestion.

More generally, probiotics are living microorganisms that have beneficial effects on the host by improving the balance of intestinal flora.

2. There are nine confirmed probiotics: Lactobacillus casei Shirota (LCS), Lactobacillus rhamnosus LGG and Lactobacillus acidophilus LA7. D. Lactobacillus acidophilus LA5, Lactobacillus acidophilus DDS, F. B. Leiter BB 12 (Bifidobacterium lactis, BB 12), G. Bifidobacterium longum bb 536, H. Lactobacillus johnsonii ii la 1 (LC 1).

3, * * * * Same characteristics: it is a living microorganism (still alive); Oral bacteria; In order to be able to act on the balance of intestinal flora, bacteria must be able to survive until they reach the intestinal system.