Probiotics are defined viable microorganisms, sufficient amounts of which reach the intestine in an active state and thus exert positive health effects.

Well-established probiotic effects are:

1. Prevention and/or reduction of duration and complaints of rotavirus-induced or antibiotic-associated diarrhea as well as alleviation of complaints due to lactose intolerance.

2. Reduction of the concentration of cancer-promoting enzymes and/or putrefactive (bacterial) metabolites in the gut.

3. Prevention and alleviation of unspecific and irregular complaints of the gastrointestinal tracts in healthy people.

4. Beneficial effects on microbial aberrancies, inflammation and other complaints in connection with: inflammatory diseases of the gastrointestinal tract, Helicobacter pylori infection or bacterial overgrowth.

5. Normalization of passing stool and stool consistency in subjects suffering from obstipation or an irritable colon.

6. Prevention or alleviation of allergies and atopic diseases in infants.

7. Prevention of respiratory tract infections (common cold, influenza) and other infectious diseases as well as treatment of urogenital infections. Insufficient or at most preliminary evidence exists with respect to cancer prevention, a so-called hypocholesterolemic effect, improvement of the mouth flora and caries prevention or prevention or therapy of ischemic heart diseases or amelioration of autoimmune diseases (e.g. arthritis).

Ref.

https://www.ncbi.nlm.nih.gov/pubmed/18461293

I agree with Dr. Manuel D. Albeirt

Probiotics are defined viable microorganisms, sufficient amounts of which reach the intestine in an active state and thus exert positive health effects.

Probiotics are supplements or foods that contain viable microorganisms that cause alterations of the microflora of the host.

The results of clinical trials in which probiotics were used to treat childhood Helicobacter pylori gastritis, irritable bowel syndrome, chronic ulcerative colitis, and infantile colic, as well as in preventing childhood atopy, although encouraging, are preliminary and require further confirmation.

Probiotics have not been proven to be beneficial in treating or preventing human cancers or in treating children with Crohn disease.

There are also safety concerns with the use of probiotics in infants and children who are immunocompromised, chronically debilitated, or seriously ill with indwelling medical devices.

REFERENCE

https://www.ncbi.nlm.nih.gov/pubmed/21115585

Probiotics are dietary supplements containing beneficial bacteria or yeasts. They are administered in different quantities that allow for colon colonization. Probiotics help in stimulating health promoting flora and also in suppression of disease causing microorganisms. Strains of genera Lactobacillus and Bifidobacterium are the most widely used probiotic bacteria.

Probiotics can be used as live medicine for treatment of infectious diarrhoea, antibiotic associated diarrhoea, bacterial gastroenteritis, Helicobacter pylori infection, bloating ulcerative colitis, non-alcoholic fatty liver syndrome, allergy, cancer and HIV infection.

Please have a look at these useful articles.

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Dear Dr

Probiotics are live microorganisms that can be found in fermented foods and cultured milk, and are widely used for the preparation of infant food. They are well-known as “health friendly bacteria”, which exhibit various health beneficial properties such as prevention of bowel diseases, improving the immune system, for lactose intolerance and intestinal microbial balance, exhibiting antihypercholesterolemic and antihypertensive effects, alleviation of postmenopausal disorders, and reducing traveller’s diarrhoea. Recent studies have also been focused on their uses in treating skin and oral diseases. In addition to that, modulation of the gut-brain by probiotics has been suggested as a novel therapeutic solution for anxiety and depression. Thus, this review discusses on the current probiotics-based products in Malaysia, criteria for selection of probiotics, and evidences obtained from past studies on how probiotics have been used in preventing intestinal disorders via improving the immune system, acting as an antihypercholesterolemic factor, improving oral and dermal health, and performing as anti-anxiety and anti-depressive agents.

There is many, many benefits and improvements in performance and medical field by use of probiotics that can not be limited in this reply box, but much research can be found to prove this improvements, but on of most important benefits was the improvement of immune system by increase activity of WBC specially activities of lymphocytes cell action...

Probiotics are beneficial bacteria for the digestive system

Best Regards Catia Cillóniz

By balancing intestinal microflora, probiotics play an important role in regulating intestinal function and digestion. Microflora are the microscopic algae and fungi already present in the digestive system. The World Health Organization define these "good" bacteria as "live microorganisms which when administered in adequate amounts confer a health benefit on the host."

See links:

Article Probiotics and prebiotics: health claim substantiation

https://www.fsai.ie/faq/probiotic_health_claims.html

Article Health Benefits of Probiotics: A Review

Yes, probiotic have potential in medicine.

Although probiotics were used to treat childhood Helicobacter pylori gastritis, irritable bowel syndrome, chronic ulcerative colitis, and infantile colic, as well as in preventing childhood atopy, it is preliminary and require further confirmation.