--- description: Find out why Seres Therapeutics was selected for the list title: TIME100 Most Influential Companies 2023: Seres Therapeutics image: https://static.time.com/v3/assets/bltea6093859af6183b/blt9fd253950bb5cd7c/698a3dcc096a9409586add61/time100-companies-Seres-Therapeutics-2023.jpg?branch=production&width=3840&quality=75&auto=webp&crop=16:9 --- Jun 21, 2023 # Seres Therapeutics Gut defense by [Alice Park](/author/alice-park/) ## Alice Park Update your preferences in [Account Settings](/account/preferences/) Close Senior Correspondent  Scanning electron micrograph (SEM) of bacteria cultured from a sample of human feces. Scanning electron micrograph (SEM) of bacteria cultured from a sample of human feces.Getty Images Supermarket shelves are full of largely unregulated probiotics that aim to keep gut bacteria in balance. With its new drug Vowst, [Seres](https://www.serestherapeutics.com/ "undefined") has created something different: the first oral prescription treatment for the microbiome. Approved by the FDA in April, Vowst is a capsule full of carefully selected bacterial spores that together can suppress growth of [_C. difficile_](https://time.com/6274112/fda-approves-microbiome-pill/ "undefined")_,_ which can cause life-­threatening infections, and are a common complication in hospitals. In studies, Vowst was 88% effective in preventing repeat infections after two months. “This is a game changer for this patient population,” says Eric Shaff, president and CEO of Seres. It will be available starting in June. _A weekly newsletter featuring conversations with the world’s top CEOs, managers, and founders._ [_Join the Leadership Brief_](https://cloud.newsletters.time.com/signup?nln=leadership&source=100companies "undefined"). Seres Therapeutics: 2023 TIME100 Most Influential Companies ```json [{"@context":"https://schema.org","@type":"Article","@id":"https://time.com/collections/time100-companies-2023/6285215/seres-therapeutics/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/collections/time100-companies-2023/6285215/seres-therapeutics/"},"headline":"TIME100 Most Influential Companies 2023: Seres Therapeutics","datePublished":"2023-06-21T10:55:40.000Z","dateModified":"2026-03-03T00:16:11.993Z","description":"","url":"https://time.com/collections/time100-companies-2023/6285215/seres-therapeutics/","keywords":["TIME100 Companies"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt9fd253950bb5cd7c/698a3dcc096a9409586add61/time100-companies-Seres-Therapeutics-2023.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Alice Park","jobTitle":"Senior Correspondent","url":"https://time.com/author/alice-park/"}],"creator":"Alice Park","articleSection":"","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt9fd253950bb5cd7c/698a3dcc096a9409586add61/time100-companies-Seres-Therapeutics-2023.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https://time.com/collections/time100-companies-2023/6285215/seres-therapeutics/","name":"TIME100 Most Influential Companies 2023: Seres Therapeutics"}}]}] ```