Sourdough Starter Jar
Also listed as Live Sourdough Culture and Bread Starter Jar.
Grains & Bakery
This is what the ingredient is.
Sourdough Starter Jar is a live flour-and-water culture sold refrigerated. Labels may say sourdough starter.
Here is why it shows up on the label.
It is fed and mixed into bread dough.
Here is what food agencies say.
FDA bakery ingredient labeling applies.
Here is what research has found.
Live cultures are perishable; spoilage is the main household risk.
Here are a few things worth knowing.
Keep refrigerated and feed regularly.
How to read this page
We publish plain facts about this ingredient so a label is easier to read. This is not medical advice, and it is not a recommendation to buy, avoid, or use anything. For a personal health question, talk with a clinician who knows your history.
v1.0Updated 9/23/2026