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.[1] He sold his patented strain of saccharomyces boulardii to Biocodex, a French pharmaceutical company in the 1950s.[2] This probiotic is used to improve gut health and treat diarrhea[3] and is available in over 100 countries as Florastor.[4][5]
^Seager, Nicholas (2012), "Thematic Criticism of the Rise of the Novel (II): Money, Medicine, Politics, and Things", The Rise of the Novel, Macmillan Education UK, pp. 169–184, doi:10.1007/978-1-137-28495-2_11, ISBN9780230251830