Henri Boulard

Henri Boulard was a French microbiologist who discovered the yeast Saccharomyces boulardii in 1923. He noticed people chewing on the skins of lychees and mangosteens to treat diarrhea during a cholera epidemic. He isolated and identified this strain of yeast, a probiotic. He sold his patented strain of saccharomyces boulardii to Biocodex, a French pharmaceutical company in the 1950s. This probiotic is used to improve gut health and treat diarrhea and is available in over 100 countries as Florastor.