Fermented products such as kefir are considered functional foods because they offer enzymes, pre-digested nutrients, amino acids, vitamins, minerals, low calories/energy and billions of good bacteria.
Probiotic pill supplements contain just one or a select variety of bacteria, and usually, that's it.
It's always better to eat something in its whole form when possible because each part makes the other more digestible. This is why companies are now adding fiber back into cereals and fruit juices - you often need all a complete complement of the parts to assimilate nutritional absorption correctly.
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