Technically a yeast, saccharomyces boulardii (SB) is sold in supplement form and is widely used in Europe for preventing and treating various digestive disorders and other illnesses. It is particularly popular for controlling diarrhea associated with antibiotic use and the consumption of unfamiliar foods while traveling. It's also recommended for diarrhea related to the inflammatory bowel condition known as Crohn's disease.
In addition, SB may be useful for people undergoing treatment for Candida overgrowth syndrome (COS). This is a controversial condition that many nutritionally oriented doctors contend is given little attention by conventional physicians. The ailment is believed to be caused by the overabundance of the yeast Candida albicans in the gastrointestinal tract.
Excessive Candida, the theory holds, attach themselves to the wall of the intestines, producing powerful toxins that are ultimately absorbed into the bloodstream. Resulting symptoms include bloating, gas, diarrhea, fatigue, headache, depression, and recurrent vaginal yeast infections.
Although it is not known exactly how saccharomyces boulardii works, three theories prevail. One is that SB is simply more efficient than Candida and other unwanted organisms when competing for space in the intestines, making it valuable for preventing as well as treating COS. Another is that SB interferes with the binding of Candida and other infectious organisms to cells in the intestines. Some sources also claim that SB increases the amount of immune proteins that fight intestinal invaders.
A standard dosage of saccharomyces boulardii for Candida overgrowth syndrome is 500 mg twice a day between meals. The supplement is sometimes prescribed along with antibiotics (such as clindamycin and amoxicillin) to maintain a healthy balance of friendly and nonfriendly organisms in the intestines.
