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They observed changes in composition of fecal microbiota, which they described as "transformation of the intestinal flora". acidophilus, and reasoned that bacteria originating from the gut were more likely to produce the desired effect in this environment. acidophilus were found very active when implanted in the human digestive tract.Contrasting antibiotics, probiotics were defined as microbially derived factors that stimulate the growth of other microorganisms.

Most of reported benefits demonstrated with the traditional probiotics have been observed after ingestion of a concentration around 10 Probiotics have received renewed attention in the 21st century from product manufacturers, research studies, and consumers.

It is commonly admitted that most effects of probiotics are strain-specific and cannot be extended to other probiotics of the same genus or species. The 2002 FAO/WHO guidelines recommend that, though bacteria may be generally recognized as safe (GRAS), the safety of the potential probiotic should be assessed by the minimum required tests: In Europe, EFSA has adopted a premarket system for safety assessment of microbial species used in food and feed productions, to set priorities for the need of risk assessment.

The assessment is made for a selected group of microorganisms, which if favorable, leads to the “Qualified Presumption of Safety” status.

This definition, though widely adopted, is not acceptable to the European Food Safety Authority because it embeds a health claim that is not measurable.

A consensus definition of the term probiotics, based on available information and scientific evidence, was adopted after a joint Food and Agricultural Organization (FAO) of the United Nations and World Health Organization (WHO) expert consultation.

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According to Metchnikoff, these compounds were responsible for what he called intestinal autointoxication, which would cause the physical changes associated with old age.