A new study published in the journal Gut found a link between vitamin B1 and good gut motility, aka the movement of food through your GI tract. Before you toss vitamin B1 supplements in your cart, there are a few things to keep in mind. For the study, researchers analyzed genetic and questionnaire data from nearly 269,000 people to try to find genes linked to gut motility. The researchers wrote in the conclusion that this is a “previously unrecognized role for vitamin B1.”There are a few theories on why B1 helps you poop. Technically, the study just found a link between vitamin B1, aka thiamine, and pooping frequency—it didn’t explore the exact reason behind this.