For the first 10 years of my career as a gastroenterologist, I prescribed probiotics the way I was taught in medical school — generically, without strain specificity, without proper dosing. And honestly? Most of my patients saw zero results.

Then I dove into the actual research—and what I found made me angry. These are the things the probiotics industry doesn't want you to hear.

Written and hosted by Dr. Will Bulsiewicz

Produced by Matt Silverman

Edited by Avital Oehler