Drinking wine that has gone bad is unlikely to make you seriously ill. In most cases, spoiled wine simply tastes unpleasant, and the worst you’ll experience is a glass you wish you hadn’t finished. The chemical changes that turn wine “bad” typically produce vinegar-like compounds that are harmless, not dangerous. That said, there are a few situations where spoiled wine can cause real discomfort, and it helps to know the difference.
Why Bad Wine Is Usually Harmless
The most common form of wine spoilage is oxidation, where oxygen reacts with the alcohol in wine and converts it into acetic acid, the same compound that makes vinegar. This process has been understood since Lavoisier demonstrated it in 1789, and it’s essentially what happens every time wine is left open too long. You end up with something closer to a weak vinegar than a toxic substance.
The bacteria responsible for this transformation, primarily acetic acid bacteria, have been used in food processing throughout human history. Their safety record is well established. These organisms are not part of normal human flora and almost never cause infections. Only two cases of human infection from acetic acid bacteria have been documented in medical literature, both in people with compromised immune systems. For a healthy person, swallowing these bacteria poses virtually no risk.
Volatile acidity, the technical term for the vinegar-like sharpness in spoiled wine, is regulated in winemaking for quality reasons rather than safety ones. The Australian Wine Research Institute notes that the components of volatile acidity “represent no threat to health.”
When Bad Wine Can Make You Sick
The exception is microbial contamination beyond the typical spoilage bacteria. If wine has been exposed to harmful microorganisms through poor handling or storage, it can cause food poisoning with symptoms like stomach cramps, nausea, vomiting, diarrhea, and fever. This is uncommon with commercially produced wine but more plausible with homemade batches or bottles stored in unsanitary conditions.
People with histamine sensitivity face a separate concern. Biogenic amines like histamine and tyramine form naturally during winemaking, but their levels can spike when fermentation happens in uncontrolled conditions or with poor cellar hygiene. Red wine contains higher concentrations of these amines than white wine. If you have a deficiency in diamine oxidase (the enzyme that breaks down histamine), drinking wine with elevated histamine levels can trigger flushing, headaches, nasal congestion, or digestive upset. Spoiled wine is more likely to have these elevated levels than properly made wine.
How to Tell Wine Has Gone Bad
Your nose is the best first test. Spoiled wine announces itself clearly through several distinct smells:
- Vinegar or balsamic: acetic acid from oxidation or bacterial activity
- Wet cardboard or wet newspaper: cork taint, caused by a chemical called TCA that contaminates natural corks
- Rotten eggs or garlic: sulfur compounds from winemaking faults or heat damage
- Cooked fruit or burnt caramel: heat damage, sometimes called “cooked” or maderized wine
- Farmyard or Band-Aid: a yeast called Brettanomyces, common in some winemaking traditions but considered a fault at high levels
Color changes are equally telling. White wines that have turned dark yellow or brown have oxidized. Red wines shift from vibrant purple or ruby tones toward rusty brick or brownish orange. Cloudiness in a wine that was previously clear can signal microbial activity.
On the palate, oxidized wine tastes flat, nutty, or like soy sauce. Cork-tainted wine tastes muted and damp. If the flavors are simply dull and unappealing, the wine has likely just passed its prime.
How Long Opened Wine Lasts
Different wines deteriorate at different rates once opened. Keeping an open bottle sealed and refrigerated extends its life, but only by so much.
- Red wine: 3 to 6 days. Full-bodied reds like Cabernet Sauvignon hold up longer than lighter ones like Pinot Noir, which is best within 2 to 3 days.
- White and rosé wine: 3 to 5 days refrigerated. Dry whites like Sauvignon Blanc last slightly longer than fuller whites like Chardonnay.
- Sparkling wine: 1 to 2 days. Bubbles dissipate quickly regardless of how well you seal the bottle.
- Dessert and fortified wines: up to 4 weeks for Port, up to 2 months for Madeira. Higher sugar and alcohol act as preservatives.
- Natural or organic wines: 1 to 3 days. Minimal preservatives mean faster spoilage.
- Boxed wine: 2 to 6 weeks, thanks to airtight inner bags that limit oxygen exposure.
These timelines assume you recork or reseal the bottle and store it in the refrigerator. Wine left open on the counter at room temperature will degrade faster.
Cork Taint Is Unpleasant but Not Dangerous
About 1 in every 15 to 20 bottles sealed with natural cork develops some degree of cork taint. The culprit is TCA, a chemical compound that forms when natural fungi in cork interact with chlorine-based sanitizers. TCA is one of the most potent off-flavor substances known, detectable at incredibly low concentrations. It suppresses your ability to smell by interfering with olfactory signaling, which is why corked wine tastes flat and muted rather than actively foul.
TCA has never been identified as toxic. Drinking a corked wine won’t harm you. It will just taste like damp cardboard, which is its own kind of punishment.
Using Bad Wine in Cooking
Wine that has oxidized or turned slightly vinegary is safe to cook with, and many cooks do this routinely. The sherry-like or nutty flavors of mildly oxidized wine can actually work well in pan sauces, braises, and stews where you’d reduce the liquid anyway. Some wine styles, like sherry itself, deliberately encourage oxidation for exactly these flavors.
The key distinction is between wine that’s past its peak and wine that’s truly gone off. If it smells like vinegar, you essentially have a rough vinegar and can use it in vinaigrettes or deglazing. If it smells like rotten eggs, wet dog, or something moldy, those flavors will carry into your food. Trust your nose: if the smell is off-putting raw, cooking won’t improve it enough to be worth using.