First of all, when you buy this probiotic product, you should see whether there are strains listed on it and whether there is a strain number after the strain name. Without the strain number, it is actually impossible to trace all the related studies of this bacterium, and its function is not clear. Many unscrupulous merchants use this to produce low-priced probiotic products, which are shoddy. So if you want to choose a probiotic product, you must know which strain it is made of. How to judge? It depends on the strain code. There is a naming rule for the name of bacteria. The first word is its genus name, the second word is its species name, and finally there is a number, which is the name of the strain (such as Bifidobacterium Bb, 12).