Sauerkraut Benefits: Probiotics, Gut Health & How to Make It

Why I Started Making Sauerkraut

My first jar scared me a little.

It was cloudy. It smelled sharp, almost sour-funky, and the cabbage had turned from pale green to a dull yellow. Everything I’d been taught about “old food” was telling me to dump it. I stood at the counter for a minute, fork in hand, feeling silly.

Then I ate some. Crunchy, salty, tangy, a little wild. Two ingredients, and it tasted better than half the things I’d bought that month.

That’s the odd thing about sauerkraut. It looks like nothing, a pile of pale shreds next to a sausage, but it comes out of one of the oldest food traditions we have. It’s also become a quiet favorite with people who care about digestion and eating in a way their gut likes.

Maybe you got here by typing “is sauerkraut good for you” into Google. Maybe you typed “what is sauerkraut,” or fumbled the spelling and wrote “saukraft” or “saurkraut” (everyone does, it’s a tricky word). Either way, this guide covers what it is, what the research really says, how it stacks up against kimchi, who should be careful, and how to make raw sauerkraut yourself.

One promise: I won’t call it a miracle. It’s a good food. Where the science is solid I’ll say so, and where it’s thin I’ll say that too.

Why I Started Making Sauerkraut
What Is Sauerkraut?
What Is a Fermented Food?
What Actually Happens in the Jar
What’s in a Serving: Nutrition
Is Sauerkraut Good for You? The Real Benefits
Raw Sauerkraut vs. the Stuff on the Shelf
Fermented Foods for Gut Health
Is Kimchi Good for You?
Who Should Go Easy
How to Make Raw Sauerkraut at Home
How to Eat It
FAQ
Last Thought

What Is Sauerkraut?

If you’re asking “what is sauerkraut,” here’s the plain answer. It’s shredded cabbage, fermented with salt until it turns sour. The word is German and means “sour cabbage.” Not much mystery in the name.

The classic recipe has two ingredients: cabbage and salt. The salt pulls water out of the cabbage, and that water becomes the brine. Then bacteria that were already living on the leaves get to work. They eat the natural sugars in the cabbage and turn them into lactic acid. That acid is where the tang comes from, and it’s also what keeps the food safe, because it makes life hard for the bad microbes.

Germany gets the credit, but the story starts further east. Historians often link fermented cabbage to ancient China, where laborers on the Great Wall supposedly ate cabbage preserved in brine or rice wine. The idea drifted west over the centuries and landed in Central and Eastern Europe, where cabbage grew well and winters were brutal. Fermenting was how a family made the fall harvest last until spring.

Sailors loved it too. Sauerkraut holds on to vitamin C, so it was packed on long voyages to keep scurvy away. Captain Cook is the name people always bring up here.

These days you’ll find it on a Reuben, in Polish bigos, in Alsatian choucroute, and on plenty of hot dogs. Different plates, same cabbage.

What Is a Fermented Food?

Before we go further, a quick detour, because “what is a fermented food” is a fair question and the answer clears up a lot.

A fermented food is something that microbes have changed. Bacteria, yeast, or mold break down the sugars and other compounds in it, and out come acids, gases, or sometimes alcohol. The food ends up tasting different, lasting longer, and often becoming easier to digest.

If you’re wondering what are fermented foods in everyday terms, you’ve probably eaten several this week:

Yogurt and kefir
Sauerkraut and kimchi
Miso, natto, and tempeh
Sourdough bread
Kombucha
Brine-fermented pickles
Cheese, wine, and beer

Here’s a catch, though. Not every fermented food still has live microbes when it reaches your plate. Sourdough gets baked, and the heat kills the bacteria. Many pickles are just cucumbers in vinegar, with no fermentation at all. If gut health is what you’re after, look for words like “live cultures,” “raw,” or “unpasteurized.”

People ate fermented food for thousands of years before anyone knew microbes existed. They just noticed it kept well, tasted good, and made them feel fine. Science is only now catching up on the why.

What Actually Happens in the Jar

I trust a process more when I understand it, so here’s what’s going on in there.

First, salt. When you salt shredded cabbage and squeeze it, the cell walls break and water pours out. That’s your brine. The salt also makes the jar a rough place for a lot of spoilage organisms.

Second, no air. Once the cabbage sits under the brine, oxygen is scarce. Lactic acid bacteria don’t need oxygen and are happy there. Molds do need it, so they struggle.

Third, the bacteria take turns. Early on, a species called Leuconostoc mesenteroides leads the way, making acid and carbon dioxide (those are the bubbles you’ll notice). As things get more acidic, other bacteria such as Lactiplantibacillus plantarum step in and push the acidity even lower.

Finally, time. Somewhere between one and several weeks, depending on how warm your kitchen is, the pH drops well below 4.6. That’s the point where it’s both safe and properly sour.

This handoff between microbes is why real sauerkraut tastes deeper than cabbage that’s just been dunked in vinegar. There’s simply more going on.

What’s in a Serving: Nutrition

Sauerkraut is low in calories and does a lot with very little. Numbers shift by brand, but a cup (around 140 grams) of the canned kind runs roughly:

About 27 calories
6 grams of carbohydrate
4 grams of fiber
1 gram of protein
Almost no fat
Around 20% of your daily vitamin C, sometimes more
A solid chunk of vitamin K, often 15 to 20% of the daily value or more
Small amounts of iron, manganese, folate, B6, and potassium
Sodium, and plenty of it, often 900 mg or higher

Look at that last line twice. Salt is what makes sauerkraut work, so it’s a salty food. If you’re watching your blood pressure, keep portions small. You can rinse store-bought kraut to cut some of the salt, but with raw versions you’ll wash off some of the good bacteria too. It’s a trade-off.

Fermentation also changes the cabbage itself. Some nutrients become easier for your body to grab, and new compounds appear that weren’t there before.

Is Sauerkraut Good for You? The Real Benefits

For most people, in normal amounts, yes. Sauerkraut is good for you, and the reasons stack up from a few directions: live bacteria (in raw versions), fiber, vitamins, and the plant compounds cabbage already has. Below are the main benefits of sauerkraut, with a note on how much evidence sits behind each.

It feeds your gut with live probiotics

This is the big one when people talk about sauerkraut benefits. Raw, unpasteurized sauerkraut carries live lactic acid bacteria, the same broad family that shows up in a lot of probiotic supplements. Think of it as one of the cheapest sources of fermented vegetables probiotics you can find.

Why care? A varied gut microbiome is tied to better digestion, a sturdier gut lining, and healthier immune signaling. Eating fermented vegetables is an easy way to add some microbial variety.

Now the fair warning. The research on sauerkraut specifically is smaller than the research on yogurt or supplements. Studies suggest bacteria from fermented cabbage can survive the trip through your digestive tract, and a few small trials hint at help for some digestive symptoms. But nobody has run the big, definitive trials yet. Promising, yes. Proven, no.

It brings fiber

Cabbage has plenty of fiber, and most of it makes it through fermentation. That fiber works as a prebiotic, which is just a fancy word for food for the bacteria already living in you. So sauerkraut gives you the microbes (when raw) and something for them to eat, in one forkful.

It may settle your stomach

A lot of people say a spoonful of kraut alongside a heavy meal makes them feel better. The acid and the by-products of fermentation may play a part, and there’s some evidence that fermented foods can help with bloating or sluggish digestion in certain people.

IBS is where it gets messy. Some people with IBS feel better on fermented foods. Others get worse, partly because cabbage contains fermentable carbohydrates that can set off symptoms. If that’s you, start with a teaspoon and pay attention.

It has vitamin C

Cabbage brings vitamin C and sauerkraut keeps a good share of it. That vitamin helps your immune system, your skin, and how well you absorb iron. It’s also the reason sauerkraut kept sailors alive centuries ago.

It has vitamin K

You’ll get vitamin K from sauerkraut, and some of it is K2, made by bacteria during fermentation (amounts vary quite a bit). Vitamin K matters for blood clotting and bones. One important flag: if you take a blood thinner like warfarin, talk to your doctor before making sauerkraut a daily habit, because big swings in vitamin K can affect how the medication works.

It may back up your immune system

A large share of your immune system is tied to your gut. A healthy microbiome helps train immune cells and keeps the intestinal barrier in shape. Sauerkraut won’t replace medical care, but vitamin C, live bacteria, and plant compounds fit nicely into an immune-friendly diet.

There’s a well-known Stanford study worth mentioning. In healthy adults, a diet high in fermented foods increased microbiome diversity and lowered several markers of inflammation. To be clear, that study looked at fermented foods in general, not sauerkraut alone. Still, it’s encouraging.

It’s light on calories

At roughly 27 calories a cup, sauerkraut adds crunch and flavor for almost no energy. The fiber helps you feel full. It won’t melt fat off you, but as a way to make plain meals taste like something, it’s hard to beat.

It has plant compounds

Cabbage is a cruciferous vegetable, which means it carries antioxidants and compounds called glucosinolates. Fermentation changes some of them, and early research suggests a few of the breakdown products may be protective. This area is still young, so treat it as a nice bonus, not a promise.

It might touch mood, through the gut-brain axis

Your gut and your brain talk constantly through nerves, hormones, and immune signals. Scientists are studying whether fermented foods and probiotics can affect mood and stress. Some early results are interesting. But the evidence isn’t strong enough to call sauerkraut a mood treatment, so I’ll leave it there.

Raw Sauerkraut vs. the Stuff on the Shelf

This is where people get tripped up. Not all sauerkraut has probiotics.

Raw sauerkraut is unpasteurized and still full of live bacteria. You’ll usually find it in the refrigerated section, at farmers’ markets, or in health food stores. The label often says “raw,” “unpasteurized,” or “live cultures.” Sometimes the lid bulges a bit, which is a sign the culture is still active and nothing to panic about.

The cans and jars sitting at room temperature in the regular aisle have almost always been heat-treated. Pasteurizing kills the microbes, which is why the product lasts on a shelf, but it also wipes out the probiotics. You still get fiber, vitamins, and flavor. You just don’t get live cultures.

And some “sauerkraut” isn’t fermented at all. It’s cabbage pickled in vinegar. Flip the jar over and read the ingredients:

Good signs: cabbage, salt, maybe caraway; “keep refrigerated”; “raw”; “live cultures”
Bad signs: vinegar high on the list, preservatives like sodium benzoate, “pasteurized,” shelf-stable

If you want the actual probiotic payoff, go with raw, or make your own. Once you’ve made a batch, you’ll always know what’s in the jar.

Fermented Foods for Gut Health

Sauerkraut is one player on a big team. For fermented foods for gut health, variety counts, because different foods carry different microbes. Rotating them gives your gut a wider mix. Good options include:

Kefir: a tangy fermented milk drink with a broad range of bacteria and yeasts
Yogurt with live cultures: check the label and skip the sugary ones
Kimchi: more on this below
Miso: great in soup and dressings
Tempeh: nutty, protein-rich fermented soybeans
Kombucha: fine, but sugar levels swing wildly, so read the bottle
Brine-fermented pickles: salt water, not vinegar

You don’t need all of them. Pick one or two you actually like and eat a little often. Consistency beats quantity, and you’ll only keep it up if you enjoy it. I learned that the hard way with a kombucha phase that lasted about three weeks.

Is Kimchi Good for You?

Sauerkraut’s louder cousin is kimchi, so the question comes up a lot: is kimchi good for you?

Mostly, yes. Kimchi is a Korean dish made from vegetables, usually napa cabbage and radish, fermented with salt, chili flakes, garlic, ginger, and scallions. Some versions include fish sauce or salted shrimp. Like sauerkraut, the raw kind is packed with live lactic acid bacteria, plus fiber, vitamins, and plant compounds.

Kimchi benefits

Here’s what kimchi benefits usually come down to:

Probiotics. It contains lactic acid bacteria, including Leuconostoc and Lactiplantibacillus, the same families found in sauerkraut.
Nutrients. You get vitamins A and C, often vitamin K, and fiber.
Gut and metabolic research. Some studies link regular kimchi eating with better digestion and improvements in markers like cholesterol and blood sugar. A lot of that work is small or observational, so hold it loosely.
Big flavor, few calories. Garlic, ginger, and chili make it punchy without piling on fat or sugar.

Sauerkraut vs. kimchi

	Sauerkraut	Kimchi
Main ingredient	Green or white cabbage	Napa cabbage, radish, others
Seasoning	Salt, sometimes caraway	Chili, garlic, ginger, scallion, fish sauce
Flavor	Sour, salty, mild	Spicy, sour, savory, layered
Origin	Central and Eastern Europe	Korea
Live probiotics (raw)	Yes	Yes
Sodium	High	High

Neither one wins. Sauerkraut is simpler and gentler; kimchi is bolder. The better choice is the one you’ll actually eat, and nothing stops you from having both. Just know that kimchi is salty too, and the spice can bother a sensitive stomach.

Who Should Go Easy

For most healthy adults, sauerkraut is fine. A few people should be more careful.

If you’re sensitive to sodium, meaning high blood pressure, kidney disease, or heart failure, the salt counts. Ask your doctor what’s reasonable and look for lower-sodium versions.

If you take an MAOI, an older type of antidepressant, be aware that fermented foods contain tyramine, which can interact and spike blood pressure dangerously. Check with your doctor or pharmacist first.

If you have histamine intolerance, fermented foods can be high in histamine and may cause headaches, flushing, or an upset stomach.

If you’re on blood thinners, the vitamin K matters. You don’t have to avoid sauerkraut, but keep your intake steady and tell your care team.

If your immune system is weakened or you have a serious gut condition, live bacteria in raw food can occasionally cause trouble. Talk to your provider first.

If you’re new to fermented foods, a big serving on day one can bring gas and bloating. Start with a tablespoon or two.

I’m not trying to scare you off. It’s the same common-sense stuff that applies to most foods. If you have a medical condition or take medication, a short chat with your doctor is worth it. This article is general education, not personal medical advice.

How to Make Raw Sauerkraut at Home

Of all the kitchen projects I’ve tried, this might be the easiest. You need almost no equipment and the ingredients cost next to nothing. Here’s the method I keep coming back to.

What you’ll need

Ingredients

1 medium head of green cabbage (about 2 pounds or 900 g)
About 1 tablespoon (18 to 20 g) non-iodized salt: sea salt, kosher salt, or pickling salt
Optional: 1 teaspoon caraway seeds, a few juniper berries, or a grated carrot

Equipment

A big mixing bowl
A sharp knife or a mandoline
A clean 1-quart (1-liter) wide-mouth glass jar
Something to hold the cabbage under the brine: a small glass jar, a fermentation weight, or a zip bag filled with brine
A cloth or a loosely set lid

The salt ratio

The usual rule is about 2% salt by weight, which is 20 grams of salt per kilogram of cabbage. Too little and you risk spoilage or mushy kraut. Too much and fermentation slows down and everything tastes harsh. A kitchen scale makes this exact, but one tablespoon per two pounds of cabbage works fine if you don’t have one.

Use non-iodized salt. Iodine and anti-caking agents in regular table salt can cloud the brine or interfere with fermentation.

Step by step

Prep the cabbage. Peel off the outer leaves and keep one or two clean ones aside. Quarter the head, cut out the core, and slice it thin, about the width of a coin or thinner.
Salt it. Put the shreds in the bowl, sprinkle the salt over, and toss.
Massage. Squeeze and knead the cabbage with clean hands for 5 to 10 minutes. It feels dry at first, and you’ll think nothing is happening. Keep going. Soon it softens and gives up a surprising amount of liquid. You’re done when a fistful squeezed over the bowl drips brine.
Add flavor. Stir in caraway or whatever extras you like.
Pack the jar. Press the cabbage in firmly, handful by handful, pushing hard to squeeze out air and force the brine up. Leave an inch or two of headroom, since it will bubble and expand.
Keep it under. Pour any leftover liquid from the bowl into the jar. Lay a reserved outer leaf on top and set your weight on it. This is the most important rule in the whole process: anything under the brine is protected, and anything above it can grow mold.
Cover loosely. A cloth with a rubber band works, or a lid that isn’t cranked tight, so the gas can escape. Airlock lids are nice too.
Wait. Set the jar on a plate to catch overflow, somewhere around 65 to 72°F (18 to 22°C) and out of direct sun. Press the cabbage down once a day to release gas and keep it submerged.
Taste. Start tasting around day 5 to 7. Plenty of people like it somewhere between one and four weeks. Warmer rooms go faster, cooler rooms slower, and longer means sourer.
Refrigerate. When it tastes right to you, put on a normal lid and move it to the fridge. The cold slows fermentation way down. Stored well, homemade sauerkraut lasts for months.

What’s normal and what isn’t

Normal:

Bubbling, fizzing, and a sour smell
Cloudy brine
White sediment at the bottom
Cabbage fading from bright green to pale yellow-green
Some brine overflow

Kahm yeast: A flat, whitish, slightly wrinkled film on top is usually just kahm yeast. It’s harmless. Skim it off and make sure everything stays under the brine. It can add off flavors, though.

Throw it out if you see:

Fuzzy, raised mold in green, black, pink, or blue
A truly rotten, putrid smell (different from a sharp sour one)
Slimy, mushy cabbage that never firms up

My rule: when in doubt, throw it out. Good sauerkraut smells clean and tangy.

Common problems

Not enough brine: Massage longer next time, or top up with salt water (about 1 teaspoon salt per cup of water).
Too salty: Rinse it briefly, or mix it with fresh cabbage or other food.
Soft or mushy: Probably too warm, too little salt, or too long.
Not sour enough: Give it more time or a slightly warmer spot.
Bland: Try caraway, garlic, dill, or juniper next batch.

How to Eat Sauerkraut

It’s tangier than you might expect, so treat it like a flavor booster at first, not a full side dish.

Starting amount: 1 to 2 tablespoons a day. If you like it and your gut is happy, work up to a quarter or half cup.

Easy ways to eat it:

On sausages, hot dogs, or bratwurst (the classic for a reason)
In a Reuben
On avocado toast with a fried egg
Mixed into potato salad or coleslaw
On grain bowls, salads, or roasted vegetables
Next to eggs, pork, or roast chicken
Straight from the jar, no judgment

Keeping the probiotics alive: Heat above about 115°F (46°C) can kill live bacteria. If probiotics are the point, add sauerkraut at the end of cooking, or eat it cold. Cooked sauerkraut is still delicious and still gives you fiber and vitamins. It just won’t give you live cultures.

FAQ

What is sauerkraut in simple terms?

Shredded cabbage fermented with salt until it’s tangy and sour. Bacteria make lactic acid, which preserves it and gives it that flavor.

Is sauerkraut good for you every day?

For most healthy people, a small daily serving is fine and may help. Watch the sodium and build up slowly if you’re new to it.

Does sauerkraut have probiotics?

Raw, unpasteurized sauerkraut does. Canned or shelf-stable kinds that were heat-treated usually don’t.

Is homemade sauerkraut better than store-bought?

Homemade is usually raw, so it has live cultures, and you control the salt. Refrigerated raw sauerkraut from a shop can be just as good.

How long does sauerkraut take to ferment?

Usually one to four weeks at room temperature, depending on warmth and your taste. You can start sampling around a week in.

How long does it last?

Many months in the fridge, as long as it stays under the brine and mold-free.

Is kimchi or sauerkraut healthier?

Both are nutritious fermented vegetables with similar probiotic benefits. Kimchi has more varied ingredients and sauerkraut is simpler. Pick the one you’ll eat, and pick raw for live cultures.

Can sauerkraut cause gas or bloating?

Yes, especially if fermented foods or high-fiber vegetables are new to you. Start small.

Can I eat it while pregnant?

Many people do, but food safety matters more during pregnancy. Pasteurized commercial products are usually the lowest risk, and it’s smart to ask your doctor or midwife about raw fermented foods.

Can I use table salt?

Non-iodized salt is better. Iodized table salt can sometimes interfere with fermentation or cloud the brine.

Why does mine smell so strong?

Fermentation produces sulfur compounds and acids, so a sharp, sour, slightly funky smell is normal. Rotten or putrid is not.

Last Thoughts

Sauerkraut is old-fashioned, but it fits how a lot of us want to eat now. It’s cheap, simple, low in calories, rich in vitamins C and K, and in its raw form it carries live bacteria. Among fermented foods for gut health, it’s one of the easiest to make and one of the most forgiving for beginners.

The short version:

Sauerkraut is cabbage and salt, fermented.
Fermented foods are changed by helpful microbes, and people have eaten them for thousands of years.
Raw sauerkraut has live probiotics, and pasteurized doesn’t.
The benefits of sauerkraut include gut support, fiber, vitamins, and few calories, though research on sauerkraut itself is still growing.
Kimchi offers a lot of the same perks with more heat.
Mind the sodium, and check with your doctor if you take MAOIs or blood thinners or have a health condition.
A homemade batch takes about 15 minutes of work, one jar, and some patience.

If you’ve been on the fence, just make one jar. The first batch is a little nerve-racking and very rewarding. And next time someone asks “is sauerkraut good for you?”, you’ll have an answer and a jar in the fridge to back it up.