38TERA® is a science-backed gut health supplement brand founded by Dr. Will Bulsiewicz ("Dr. B"), a board-certified gastroenterologist and New York Times bestselling author, alongside Simon Hill, nutrition scientist and host of The Proof podcast.
Frustrated by a supplement market full of hype and little science, they built the brand they wished existed: every formula clinically dosed and third-party tested. The gut is the foundation of whole-body health, and it deserves to be treated that way.