Saccharomyces boulardii is true probiotic yeast. It has potent beneficial effects in the body without the risk associated with some other probiotics.
Probiotics are marketed as a way to restore normal ratio of good yeast and bacteria in the system, helping maintain normal bowel movements, aiding digestion, and promoting intestinal health.
Saccharomyces Boulardii yeast protect against intestinal dysbiosis caused by a disruption in the balance of health gut flora.
The human gastrointestinal tract refers to the stomach and intestine, which always releases hormones to help regulate the digestion process.
Saccharomyces boulardii benefits the gastrointestinal tract in a variety of ways. It inactivates bacterial toxins, inhibits toxin binding to intestinal receptors and lessens toxin-induced inflammation. It reduces the ability of potentially harmful microorganisms to adhere to and invade intestinal cells. S. boulardii stimulates host immune defenses and intestinal enzymes that enhance nutrient digestion and absorption. It produces acids that combat potentially harmful microorganisms, assists in mineral absorption and nourishes the colon.
The rationale of using Saccharomyces boulardii:

• Saccharomyces boulardii is the only probiotic to survive in the presence of antibiotics and in gastric acidity
• It is considered to be the safest among all probiotics
• Saccharomyces boulardii is used in the treatment of disorders such as: Antibiotic associated diarrhoea. (Rotavirus induced diarrhoea in infants & children)
  • Lactose intolerance
  • Food allergies
• Supports healthy bowel microflora during or following antibiotic therapy
• Supports children and adults with acute diarrhea
• Supports against traveler's diarrhea
• Supports AIDS-associated diarrhea
• Supports tube-fed patients with diarrhea
• Supports children with autism
• Supports people with inflammatory bowel diseases

A Nutritional Probiotic that Nutritionally Supports the GI tract by maintaining gut flora balance.

Indications & Usage:
This formula has been formulated as it:
● Promotes the health of the intestinal tract
● Helps to encourage a healthy gut flora balance
● Supports a balanced inflammatory response.
● Useful in inflammatory bowel disease or other types of  diarrhea

About Composition:
Saccharomyces boulardii is unique, non-pathogenic yeast and an ideal dietary supplement that has been utilized worldwide as a probiotic to support gastrointestinal health. Saccharomyces boulardii has been found to be non-systemic, surviving only in the gastrointestinal tract at low pH levels, and capable of growth at temperatures up to 37°C. Saccharomyces boulardii is similar to Saccharomyces cerevisiae in the property that both lack the ability to penetrate into tissue like Candida species can, so they are not invasive. Saccharomyces boulardii is unable to form spores, so the chance of translocation to other parts of the body is reduced, too.
According to World Health Organization, probiotics are "live micro-organisms which, when administered in adequate amounts, confer a health benefit on the host". Mostly they are composed by a mixture of Lactobacilli and Bifidobacteria species but also the yeast Saccharomyces boulardii is found to be an effective probiotic
Saccharomyces boulardii has been proven to be an effective probiotic in studies in animals and humans, especially preventing antibiotic associated diarrhea (AAD). The studies were performend on hospitalized patients though randomized trials in order to prevent  AAD. 
One of the biggest advantages of using Saccharomyces boulardii, especially when taking antibiotics, is that it is not affected by antibiotics since it is yeast.
Therefore, it can help to keep pathogenic microbes and yeasts such as Candida from overwhelming the body when the antibiotics kill most of the good bacteria and most, but not all, of the bad bacteria in GI tract.
The product is available in a lyophilized form (freeze-dried) having mix fruit & sweat orange flavours that tastes sweet when eaten.

Side Effects:
Side effects of thirst and constipation are rare and insignificant in healthy individuals. Diarrhea may occur as the population of flora changes.

Special Warning & Precautions:

For Pregnancy and breast-feeding:
There is not enough reliable information about the safety of taking Saccharomyces boulardii. If you are pregnant or breast feeding, stay on the safe side and avoid use.

Storage:
Store in a cool, dry & dark place. Protected from direct sunlight.