This video “What is a ProBiotic” is an advert for a probiotic. But it is good at describing the process and how probiotics work.
The probiotics they are advertising are freeze dried and have only six strains. The good thing about the probiotic is that it is enteric coated, meaning that the probiotics are protected against the stomach acid.
Noster ProBiotic is a live culture and has 10 strains. The more strains the better.