Key findings
- 1Sauerkraut requires exactly two ingredients; cabbage and salt, making it one of the simplest fermented foods on earth
- 2Lactobacillus bacteria on the cabbage surface drive fermentation naturally, producing lactic acid that preserves the food without any industrial intervention
- 3Pasteurized sauerkraut has no added ingredients but lacks the live probiotic cultures found in refrigerated, unpasteurized versions
Why is Sauerkraut Level 2 on average?
Sauerkraut fermentation is remarkably simple: shredded cabbage is mixed with 2-3% salt by weight, packed tightly into a container, and left at room temperature for 1-4 weeks. The salt draws water from the cabbage cells through osmosis, creating a brine. Lactobacillus bacteria (naturally present on the cabbage surface, not added) consume sugars and produce lactic acid, dropping the pH below 4.6, and the threshold at which pathogenic bacteria cannot survive. This is the same biological mechanism behind kimchi, yogurt, and sourdough. The entire process uses two ingredients (cabbage and salt) and one biological mechanism (bacterial fermentation). Pasteurized sauerkraut has been heat-treated to extend shelf life, killing the live cultures but not adding any ingredients; it keeps the same two-ingredient list, just without probiotic activity. In our analysis, sauerkraut products average a Processing Score of 3.1, which is Level 2.
How 159 sauerkraut products break down
Share of products at each processing level, in our analysis.
Sauerkraut brand comparison
From least to most processed in our database.
How to read a sauerkraut label
- 1
Traditional sauerkraut should list only cabbage and salt; two ingredients total
- 2
Refrigerated, unpasteurized sauerkraut contains live Lactobacillus cultures; look for it in the refrigerated section
- 3
Shelf-stable (canned or jarred at room temperature) sauerkraut has been pasteurized, live cultures have been killed by heat
- 4
Watch for sauerkraut with added wine, vinegar, or preservatives (sodium benzoate), and these are non-traditional additions
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Frequently asked questions
Is store-bought sauerkraut fermented?
It depends on the product. Refrigerated sauerkraut (usually in bags or jars in the cold section) is typically raw and fermented with live cultures. Shelf-stable canned or jarred sauerkraut has been pasteurized; the fermentation occurred but the heat treatment killed the live bacteria afterward.
Is sauerkraut a probiotic food?
Unpasteurized sauerkraut contains live Lactobacillus bacteria; genuine probiotic organisms produced naturally during fermentation. Pasteurized sauerkraut does not contain live cultures. Neither adds ingredients, but only unpasteurized versions have active probiotics.
How is sauerkraut different from coleslaw?
Sauerkraut is fermented cabbage (cabbage and salt, aged for weeks). Coleslaw is raw shredded cabbage with a mayonnaise or vinegar dressing, and how processed it is depends on the dressing. They start with the same vegetable but use completely different preparation methods.
Does sauerkraut go bad?
Properly fermented sauerkraut is self-preserving; the lactic acid produced by fermentation inhibits spoilage organisms. Refrigerated raw sauerkraut can last months. Canned (pasteurized) sauerkraut has a shelf life of years. The preservation is achieved by the fermentation process itself, not by industrial additives.