If you’ve ever bought a supermarket loaf labelled “sourdough,” you might have wondered: is this really sourdough?
Many people are now asking whether breads sold in Lidl, Tesco, Co-op, Sainsbury’s and other UK supermarkets are authentic, or if they’re just clever marketing.
The short answer? Most supermarket “sourdough” is not true sourdough at all. It’s what the Real Bread Campaign calls “sourfaux” – loaves made with shortcuts, additives, and commercial yeast instead of the slow-fermented, natural process that makes sourdough special.
What Makes Real Sourdough Different?
Real sourdough bread is made from just three things:
- Flour
- Water
- Salt
And the key ingredient: a live sourdough starter culture that’s been nurtured over time. This starter is a community of wild yeasts and beneficial bacteria that naturally ferment the dough.
The process takes hours (sometimes days), and it’s this long fermentation that develops flavour, texture, and digestibility.
Supermarket loaves, on the other hand, often:
- Add baker’s yeast to speed things up
- Include preservatives, emulsifiers, and enzymes
- Use sour flavourings instead of natural fermentation
That’s why the Real Bread Campaign encourages people to “say no to sourfaux” and look for genuine loaves. Find out more about the campaign here.
Why Supermarket “Sourdough” Isn’t Proper Sourdough
Most loaves labelled as sourdough in supermarkets are designed to be baked quickly and cheaply. Even when they contain a starter, it’s often used alongside added yeast and processing aids.
That means:
- They don’t offer the same gut-friendly benefits of natural fermentation
- The flavour is flatter, with none of the depth or complexity
- The texture is more like standard factory bread than artisan sourdough
So while they may look the part, they’re not true sourdough.
The Only Way to Be Sure: Bake Your Own
The easiest way to guarantee you’re eating real sourdough bread is to bake it yourself. And the foundation of every authentic loaf is a healthy, active starter.
At Sourdough by the Sea, we create handmade sourdough starter cultures that are perfect for home bakers. Each culture is carefully nurtured using traditional methods, so you can enjoy:
- Genuine long-fermented sourdough with no additives
- A living starter that grows with you and can last for years
- The same flavour, texture, and authenticity supermarkets can’t match
👉 Get your handmade sourdough starter culture and say goodbye to supermarket sourfaux.
Why the Real Bread Campaign Matters
The Real Bread Campaign fights for honesty in bread labelling. Right now, UK law doesn’t stop supermarkets from calling almost anything “sourdough,” even if it’s packed with additives and baker’s yeast.
By supporting the campaign, and choosing to bake at home with real starter cultures, you’re:
- Saying no to misleading supermarket loaves
- Supporting better bread standards
- Keeping alive the craft of traditional baking
So, are Lidl, Tesco, Co-op, and Sainsbury’s supermarket sourdough loaves proper sourdough?
For the most part, no. They’re usually sourfaux — breads that look the part but skip the natural process.
If you want the real thing, start at home with an authentic culture. Our handmade sourdough starter cultures are the simplest way to bake true sourdough that’s full of flavour, better for your gut, and completely free from additives.
👉 Say no to sourfaux. Say yes to real sourdough.
Ready to Start Making Your Own Sourdough?
At Sourdough by the Sea we offer Starter Gift Sets that include everything you need: starter jar, proofing basket, dough cutter, full guide to maintaining your culture + recipes. Check out our Sourdough Starter Gift Sets.
Why our Starter Kits?
- All-in-one: you don’t need to hunt for extra items.
- Designed for beginners AND confident home bakers.
- Backed by our guide and support so you’ll get results.
Sourdough Breadmaking at Home with our Bestselling Sourdough Starter Gift Sets
Choose from one of our Bestselling Sourdough starter gift sets – which comes with all you need to make delicious tasting bread and pizzas any time of year. Starter jar, proofing basket, dough cutter and our guide to looking after starter culture, recipes and more.
