There are advantages of taking pharmaceutical grade probiotics. They will assist the indigenous flora to re-growth. They help to “normalize” the intestinal function and boost the immune system.
They also have more health benefits.
But, it is criminal that many websites that promote probiotics still sell the idea they will go to form colonies in your gut to replace the lost intestinal flora. Probiotics are expensive, and many people buy them thinking about repopulating the colon flora when it isn’t true.
People should be aware of the true. People should expend their money knowing pharmaceutical grade probiotics are transient organisms. Feeding them or not with Prebiotics, they don’t colonize permanently the intestines. They assist and favor colonization and normalization of the intestinal flora modulating it. This what science knows so far. At some point, it is probably better to take a good Prebiotic such as Lactofiltrum to increase bifidobacterium population in the colon.
I bet all my money there are thousands of people who have bought probiotics thinking they are going to repopulate the intestines. This is what the market promotes to make money. Criminal, after all.