Is sauerkraut juice actually good for you?

Raw, unpasteurised sauerkraut juice contains live lactic acid bacteria (mainly Lactobacillus and Leuconostoc species), vitamin C, vitamin K2, and organic acids from fermentation. It can support digestion and add beneficial microbes to the gut. The main caveat is sodium — the brine is essentially a 2% salt solution, so it's a supplement in tablespoon doses, not a drink you gulp by the glass.

How much sauerkraut juice should I drink per day?

Start with 1–2 tablespoons (15–30 ml) once a day and see how your gut responds. Many people work up to 2–4 tablespoons, or a small 60 ml shot. There's no need to drink more — the benefit comes from the live cultures, not the volume, and drinking large amounts mainly adds a lot of salt.

Does sauerkraut juice make you poop?

It can. The live bacteria, organic acids, and the small osmotic pull of the salty brine all nudge the digestive tract, so some people notice a mild laxative effect, especially at first. Start small to avoid cramping or loose stools, and increase gradually as your system adjusts.

Can I use store-bought sauerkraut juice for probiotics?

Only if it's raw and unpasteurised — usually sold refrigerated and labelled 'live', 'raw', or 'contains live cultures'. Shelf-stable canned or jarred kraut has been heat-pasteurised, which kills the bacteria. It still has fibre and some vitamins, but no live probiotics.

Is sauerkraut juice good for a hangover?

It's popular folklore and there's a grain of logic to it: the brine replaces sodium and other electrolytes lost to alcohol, and the sour taste can settle a queasy stomach. That's rehydration and salt, though — not a proven cure. There's no strong evidence it clears a hangover faster than water and salt would.

Can I drink the brine from the sauerkraut jar?

Yes, the liquid in a jar of raw sauerkraut is the juice — there's nothing separate to buy. Just make sure the kraut is raw and hasn't gone off (it should smell sour and clean, not rotten or yeasty), and keep it refrigerated once opened.

Can sauerkraut juice start a new ferment?

Yes. The last inch of live brine is full of active lactic acid bacteria, so adding a splash to a fresh batch of salted vegetables gives fermentation a head start and can lower the risk of early spoilage. It's optional — cabbage ferments fine on its wild bacteria alone — but it's a handy way to reuse the brine.

Sauerkraut Juice: Benefits & How to Drink It — Ferment Calculator

Sauerkraut juice is the raw, cloudy brine left behind when cabbage ferments — a live, tangy, salty liquid rich in lactic acid bacteria, vitamin C, and organic acids. Drunk in small shots it can support digestion and top up your gut microbes, and saved by the spoonful it makes an excellent starter for your next batch of ferment.

What is sauerkraut juice?

Sauerkraut juice isn’t a manufactured drink — it’s simply the brine that pools around fermenting cabbage. As salt draws water out of shredded cabbage, the liquid becomes the medium where wild Lactobacillus and Leuconostoc bacteria do their work, converting sugars into lactic acid. That acid is what makes the juice sour, preserves the kraut, and gives the liquid its probiotic value.

The one thing that matters most is raw versus pasteurised. Live juice comes from refrigerated, unpasteurised sauerkraut — the kind sold in the chiller and labelled “raw” or “live”. Shelf-stable canned or jarred kraut has been heat-treated, which kills the bacteria. It still tastes tangy and holds some vitamins, but the probiotics are gone.

What are the benefits?

The juice concentrates much of what makes sauerkraut a functional food. Because it’s a liquid, the live cultures and dissolved nutrients are immediately available.

Live probiotics Raw brine is dense with lactic acid bacteria — the same Lactobacillus and Leuconostoc strains that ferment the cabbage — which can add beneficial microbes to the gut.

Electrolytes The brine is essentially salted water, so it supplies sodium plus small amounts of potassium and magnesium — handy after heavy sweating or fluid loss.

Vitamins & acids Fermentation preserves vitamin C and produces vitamin K2, B vitamins, and organic acids like lactic and acetic acid that support digestion.

Because the goodness is in the cultures and micronutrients rather than the volume, a little goes a long way. There’s no advantage to drinking more than a shot or two.

How to drink sauerkraut juice

The simplest approach is a straight shot: pour off a tablespoon or two from the jar and drink it neat. It’s bracing and salty-sour, so most people build up to it.

Neat shot 1–2 tbsp straight from the jar, best on an empty stomach or just before a meal.

Diluted stir into a glass of water or tomato juice if the straight brine is too intense.

Pickleback a shot of brine chased after spirits — a bar tradition and a gentler intro to the taste.

In cooking whisk into salad dressings, marinades, or a Bloody Mary — but heat kills the probiotics, so keep it raw for gut benefits.

Post-workout sip diluted to replace sodium lost through sweat, like a natural electrolyte drink.

Take it raw and unheated whenever the live cultures are the point. Cooking with the juice still adds flavour and acidity, but it won’t deliver probiotics.

How much should you drink?

Start small and let your gut set the pace. A sudden large dose of unfamiliar bacteria and salt can cause bloating, cramping, or loose stools.

1–2 tbsp starting dose (15–30 ml)

2–4 tbsp typical daily amount

~60 ml a full shot, once tolerated

Begin with a single tablespoon a day for a few days, then work up if you feel fine. Most people settle at a small daily shot. The mild laxative effect some notice — from the live bacteria, organic acids, and the salt’s gentle osmotic pull — is another reason to increase slowly rather than start with a glassful.

Reuse it as a starter culture

The most practical way to reuse the last inch of brine is to pour it into a new batch of salted vegetables. It’s a live inoculant — full of active lactic acid bacteria that get fermentation moving faster and help acidify the batch before spoilage organisms take hold.

1
Save the live brine Keep the final 2–4 tablespoons from a jar of raw, actively fermented kraut. Fresher brine has a livelier, more active culture than one that has sat for months.
2
Salt your new veg correctly The salt does the real work — aim for roughly a 2% brine for most lacto-fermented vegetables. Get the percentage right first, then add the starter as a boost.
3
Add the brine Stir the reserved juice through the freshly salted, packed vegetables before you weigh them down under the liquid. A splash per jar is plenty.
4
Ferment as usual Keep everything submerged at 18–22°C. You should see bubbles a little sooner than an un-inoculated batch — often within a day.

This is optional: cabbage carries all the wild bacteria it needs and ferments perfectly well on its own. But a spoon of live brine is a low-effort head start, especially for slower ferments or a cold kitchen. Dial in the salt first, then let the starter do the rest.

Try the calculator

Fermentation Brine Calculator

Get the exact salt weight for a reliable 2% brine on any batch size.

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Hangovers & gut folklore vs the evidence

Sauerkraut brine has a long reputation as a hangover cure and digestive tonic, and there’s partial truth behind the claims. As a hangover remedy, the logic is real but limited: alcohol depletes sodium and fluid, and the salty brine replaces both while the sourness settles a queasy stomach. That’s rehydration and electrolytes — not a special cure. Water and a pinch of salt would do much the same, and no study shows the juice clears a hangover faster.

The gut-health folklore stands on firmer ground. Live lactic acid bacteria and the acids they produce genuinely support digestion for many people, and fermented foods are a well-studied part of a healthy diet. What’s overstated is any promise of a single “detox” or miracle effect. Treat the juice as a modest, pleasant supplement to a varied diet — helpful, not magic.

Cautions before you drink it

The same salt that preserves the kraut is the main reason to go easy on the juice.

! Watch for

Sodium adds up fast — brine is roughly a 2% salt solution, so a shot can carry a meaningful share of a daily limit
Go carefully if you have high blood pressure, kidney disease, or are on a sodium-restricted diet — check with a clinician first
Only drink raw, unpasteurised brine for probiotics; discard anything that smells rotten, yeasty, or off, or shows fuzzy mould
Start with 1 tbsp to avoid bloating, cramping, or loose stools while your gut adjusts
Keep opened jars refrigerated and use clean utensils so you never contaminate the live brine

Count the juice toward your daily sodium the way you would any salty food. Used in tablespoon doses from a raw, clean jar, it’s a safe and genuinely useful thing to keep in the fridge.