How to Eat Sauerkraut for Gut Health

Sauerkraut brings more to your kitchen table than tang, assuming you’re buying the right kind.

Throw a rock inside any gym, and you’re bound to hit someone who will happily proselytize about the gut microbiome-enhancing benefits of fermented foods like sauerkraut. But if you’ve got a jar of the popular cabbage-based dish sitting on your shelf or tucked in the back of your fridge, we’re sorry to say that how to eat sauerkraut for gut health matters more than you think.

Not all fermented foods are made equally, and the sauerkraut gut health benefits you actually get depend on a few specifics. The shelf-stable jars commonly found in your local stores are likely pasteurized — aka heated to a specific temperature to kill bacteria, including many of the beneficial bacteria. To get the fullest benefits from your fermented food habit, there are a few things you need to know: the type of kraut you’re buying, how you store it, how you serve it, and how much you’re eating.

TL;DR

For the biggest gut-health upside, eat raw, unpasteurized sauerkraut from the refrigerated section, and don’t cook it. Start with a small serving, about 1 to 2 tablespoons daily, then build toward a quarter- to half-cup if your stomach handles it well. Shelf-stable jars can still offer flavor and fiber, but usually not the live cultures you’re after.

How Sauerkraut Supports Your Gut

Any jar of sauerkraut you pick up starts as a mixture of cabbage, salt, and many hours of time. Those ingredients then undergo fermentation, in which naturally occurring bacteria feed on the food’s carbohydrates to produce live microbes, such as lactic acid bacteria (LAB). The most common LAB strain found in traditionally fermented sauerkraut is Lactobacillus plantarum, alongside species like Leuconostoc mesenteroides and Lactobacillus brevis.

These bacteria are often casually referred to as probiotics, though the strict definition of a probiotic is a live microorganism shown to provide a health benefit when consumed in adequate amounts. While raw sauerkraut can contain live cultures, it’s a stretch to call it a “probiotic.” And even though every jar of sauerkraut is fermented, not every kind contains live bacteria.

Those live bacteria, found in unpasteurized, “raw” versions of your favorite fermented foods, matter because they are more likely to survive digestion and interact with the community of bacteria and microbes living in your digestive tract (aka the gut microbiome). Doses of raw fermented foods can introduce new bacteria into your internal ecosystem, which can create microbiome diversity, and, over time, a more resilient gut. 

Sauerkraut has other nutritional benefits, too. It contains fiber — about 3 grams per 100 grams, according to USDA-linked nutrition data — which feeds your existing gut bacteria, supports regularity, and contributes to the higher-fiber style of eating associated with better long-term health. The fermentation process also produces other byproducts, such as lactic acid and a range of microbial metabolites, which can benefit your gut microbiome. Sauerkraut also delivers vitamin C and vitamin K — about 15 mg of vitamin C and 13 mcg of vitamin K per 100 grams, per USDA data — which support immune function and bone health.

What the Research Says About Sauerkraut and Gut Health

Research on sauerkraut and the gut microbiome is still emerging. One of the strongest studies showcasing the effects of fermented foods on the gut is a Stanford human trial published in the journal Cell. Researchers compared the benefits of a high-fiber diet with those of a diet high in fermented foods. Ultimately, the high-fermented-food diet increased participants’ microbiome diversity and decreased inflammatory markers over 10 weeks. This study isn’t directly linked to sauerkraut, but it showcases how live-culture, raw fermented foods may affect your gut’s ecosystem.

As for sauerkraut-specific studies, one examines how live microbes fare during digestion. In a 2021 non-human, lab study published in Frontiers in Microbiology, researchers found that lactic acid bacteria (LAB) in sauerkraut had a 70-80% survival rate during simulated oral, stomach, and small-intestinal digestion. That doesn’t prove the bacteria permanently colonize the gut, but it does suggest that raw sauerkraut, whose microbial count can vary brand to brand, can deliver live microbes to your system.

There’s also the question of raw vs. pasteurized sauerkraut, and whether heating fermented foods to kill microbes (some of which can be dangerous to humans) renders them useless to your gut. A 2025 crossover intervention trial published in Microbiome compared daily consumption of fresh versus pasteurized sauerkraut in 87 healthy adults. Participants ate 100 grams (about ⅔ cup) of one type of sauerkraut daily for four weeks, went through a four-week washout period, and then ate the other type for another four weeks. 

The raw variety was the only one to deliver sauerkraut-derived live bacteria, including Lacticaseibacillus paracasei. However, the pasteurized sauerkraut still appeared to affect the gut by increasing serum short-chain fatty acids, a group of compounds produced by gut microbes that help fuel colon cells and may play a larger, overall role in gut and metabolic health. 

The surprising part wasn’t what the researchers found, but what they didn’t: Neither fresh nor pasteurized sauerkraut significantly changed a healthy person’s overall gut microbiome. In other words, raw sauerkraut may be the better choice if you specifically want live bacteria, but pasteurized sauerkraut may still contain microbial byproducts that interact with the gut. Don’t assume shelf-stable sauerkraut is nutritionally worthless. 

There are still open questions. Most studies on sauerkrauts and humans are short-term and with healthy adults, so researchers don’t yet have a clear answer on the ideal dose, how long someone needs to eat it for meaningful changes, whether people with digestive symptoms respond differently, or how long any benefits actually last. 

How to Eat Sauerkraut for Gut Health, Step by Step

• Shop for unpasteurized sauerkraut. If you’re eating sauerkraut for its live microbes, look for raw, unpasteurized sauerkraut in the refrigerated section. The label may use words like “raw,” “live,” or “contains live cultures.” The ingredient list should be simple: cabbage, salt, and possibly basic seasonings like dill or caraway seed. Skip any jar that lists vinegar — those are pickled, not fermented, and won’t contain live cultures. Popular brands that sell raw sauerkraut include Cleveland Kitchen and Wildbrine.
• Consume less than you think, as the bacteria in live-culture foods can irritate some people’s stomachs. Start with a small serving, about 1-2 tbsps per day. If it sits well after a few days, add more until you’re at about ⅔ cup (the amount used in one of those clinical trials linked above). 
• Don’t cook it. This step is crucial. Heating sauerkraut can kill many of the live bacteria you’re trying to get from it. If you’re adding it to a warm meal, spoon it on at the end instead of cooking it in the pan.
• Add it to meals for a cool, crunchy texture. Try it on a sandwich, with chicken sausage and mustard, on a grain bowl or salad, or even alongside your morning eggs and potatoes. The goal is to find ways you enjoy eating it rather than just choking it down because an internet article told you to.
• Be sure to store it sealed in your fridge to keep the live cultures alive. Ideally, your fridge should be at or below 40 degrees Fahrenheit, which slows fermentation and preserves the texture and taste of the sauerkraut, as well as the microbes you’re after. 
• Don’t toss the brine. The liquid in the jar carries live cultures too, so spoon a little over your meal or stir a splash into a vinaigrette instead of pouring it down the drain.
• Note: If you’re new to eating fermented foods, gas and bloating can be normal, so give yourself a week or so to acclimate before ramping up your intake.

When to Go Easy on Sauerkraut

It’s safe to say that sauerkraut is a low-risk food, but, as with any dietary change, people need to be aware of how it interacts with their personal lifestyle. Because salt is a core ingredient, sauerkraut contains 660 milligrams of sodium per 100 grams, which is 44% of the American Heart Association’s ideal 1,500mg daily limit. People with high blood pressure, kidney disease, heart failure, or on a sodium-restricted diet should talk with their doctors before making sauerkraut a diet staple. 

Other groups may want to be cautious, too. People who are immunocompromised should check with a healthcare provider before regularly eating raw, unpasteurized sauerkraut, since it contains live bacteria. People with IBS (irritable bowel syndrome) or other gut issues may find that raw sauerkraut and other fermented foods trigger gas or bloating. And if you have histamine intolerance, sauerkraut may be a poor fit, since fermented foods can be high in histamine and may worsen symptoms in sensitive people.

The easiest rule: start small and pay attention. Try 1-2 tbsps with a meal, see how your stomach handles it, and build from there. A little gas or bloating can happen when you’re new to fermented foods, but if sauerkraut consistently leaves you feeling worse, it may not be for you.

Frequently Asked Questions

Bottom Line on Eating Sauerkraut for Gut Health

Sauerkraut isn’t a gut miracle, but emerging research suggests it may support overall gut health. Specifically, raw, refrigerated sauerkraut can provide you with more live cultures for a more diverse gut microbiome. There are still a lot of questions, though, like which strains survive digestion and how much you actually need. What you buy, how you store it, and whether you heat it will change what you actually get from each bite. And remember to talk with a dietitian or doctor if you’re dealing with ongoing digestive symptoms or have a preexisting condition before making any dietary changes.