Does the sourdough culture contain dairy? Yes, it contains traces of dairy.Please note, as you're using such a low amount each time, lactose intolerant people often use this without problems - however, please see professional advice for your own level of intolerance. Related articles How to Guide - Sourdough I’ve left my dough to rise for 48 hours instead of 24 but it isn’t rising as much in the second day as in the first. Have I done something wrong? Can I use spelt flour in the sourdough? Is the sourdough yeast gluten free? How to Video - Greek Yoghurt