Is Sourdough Bread Vegan? What to Look Out For
By Maya Ellison · Reviewed by Maya Ellison · Updated August 30, 2026 · 2 min read
The short answer
It's a refreshingly simple question with a slightly more complicated answer. Is sourdough bread vegan? The short version: yes — but only if it's made the traditional way. Sourdough gets its name from the wild fermentation that leavens the dough using just flour, water and salt. In that pure form, it's completely plant-based, and so is the starter that makes it.
The catch is that the word "sourdough" on a supermarket shelf or bakery case doesn't always mean the simple three-ingredient loaf. Plenty of commercial and enriched sourdoughs add things you'd want to avoid on a plant-based diet.
Is a sourdough starter vegan?
Yes. A sourdough starter is simply flour, water and a community of wild yeast and lactic-acid bacteria — all vegan. The microbes aren't animals, and as long as you feed the starter only flour and water, it stays vegan.
The one thing to watch is that some sources suggest feeding a starter with honey, milk or whey. If you're baking strict vegan sourdough, keep your feeding to flour and water only. That's also the healthiest, most traditional approach.
What makes sourdough bread not vegan?
Sourdough bread turns non-vegan when animal-derived ingredients get added. The culprits to watch:
- Eggs — in enriched loaves like challah, brioche or some sandwich breads
- Butter, milk, buttermilk, whey, ghee — in enriched sourdoughs and buttered rolls
- Honey — used as a sweetener in some recipes
- Lard — occasionally in savory loaves
- Hiding spots — tins greased with butter, crusts washed with egg or milk, and emulsifiers like mono-/diglycerides or lecithin that can be animal-derived
A plain, crusty, flour-water-salt sourdough rarely contains any of these. It's the enriched versions where you need to look closely.
How to check store-bought sourdough
The ingredient list is your friend. Don't rely on the word "sourdough" or a rustic-looking bag — read what's actually in it. If you see butter, milk, eggs, honey, whey or lard, it's not vegan.
For tricky emulsifiers, allergy labels help catch dairy and egg most of the time, but they won't always flag honey or royal jelly. If you can, ask the baker directly: What do you feed your starter with? What do you grease the tins with? Is the crust washed with egg or milk?
The surest way: bake your own
Homemade sourdough is the absolute most reliable way to guarantee a vegan loaf. Make a flour-and-water sourdough starter, then bake a basic sourdough bread of just flour, water and salt. You control every ingredient, and you know for certain what's in the loaf.
If you want to skip the bake and explore ways to use your starter, the discard recipes hub is full of vegan-friendly options made from the same simple, plant-based ingredients.
Frequently asked questions
Is a sourdough starter vegan?
Yes. A starter made from just flour, water and the wild yeast and bacteria that colonize it is entirely vegan. Those microbes are not animals. Just be sure you feed it only flour and water — some recipes suggest honey, milk or whey, and a starter fed those wouldn't be vegan.
What makes sourdough bread NOT vegan?
The animal-derived ingredients added in enriched or flavoured sourdoughs: eggs, milk, butter, honey, buttermilk, whey or lard. Watch out for enriched loaves like sandwich bread, brioche, challah or buttered rolls, and for tins greased with butter or loaves glazed or washed with egg or milk.
Is all sourdough bread dairy free?
No — a simple flour-water-salt sourdough is dairy free, but many enriched sourdoughs contain butter, milk or buttermilk. Check the label or ask the baker. Dairy can also sneak in via butter-greased tins or a milk wash on the crust.
Can a starter that was fed with milk or honey be used for vegan bread?
Technically the finished bread could still be mostly vegan if the starter is diluted away, but purists would say no — if the starter is fed animal-derived ingredients, the resulting bread isn't fully vegan. For guaranteed vegan sourdough, feed your starter only flour and water.
How can I tell if store-bought sourdough is vegan?
Read the ingredient list, not just the word 'sourdough' on the label. Look for butter, milk, whey, eggs, honey, ghee or lard. Watch for emulsifiers like mono- and diglycerides or lecithin, which can be animal-derived. When in doubt, a 'certified vegan' label or asking the baker directly is the safest.
Is sourdough bread healthier than regular bread for vegans?
Many people find a slowly fermented sourdough easier to digest because the fermentation partially breaks down gluten and reduces phytic acid, making nutrients more absorbable. But that's a property of the long ferment, not a vegan-specific benefit. Our [nutrition guide](/guides/sourdough-bread-nutrition) has the honest details.
Can I make vegan vegan-friendly sourdough at home?
Absolutely — and homemade is the surest way. Make a flour-and-water starter and bake a basic bread of flour, water and salt. It's naturally vegan, and you control every ingredient. Our [sourdough starter guide](/sourdough-starter) and [basic bread recipe](/sourdough-bread-recipe) are the place to start.