Drinking wine that has gone bad is unlikely to make you seriously ill. Wine’s combination of alcohol, acidity, and low pH creates an environment where dangerous foodborne bacteria like Salmonella and E. coli struggle to survive. So the consequences of a sip or even a glass of spoiled wine are mostly unpleasant rather than dangerous. That said, “bad” wine comes in several forms, and some cause more discomfort than others.
Why Spoiled Wine Won’t Give You Food Poisoning
Wine sits at a pH around 3 to 3.5, which is acidic enough to discourage the growth of most pathogens that cause classic food poisoning. While the alcohol content in wine (typically 10 to 15%) isn’t strong enough on its own to kill bacteria, the combination of organic acids like tartaric and malic acid with ethanol creates a hostile environment for dangerous microbes. Researchers have found that neither the pH nor the ethanol alone fully explains wine’s antimicrobial properties, but working together they make wine a poor host for the bugs that typically land you in the bathroom for days.
This is why you’ll never hear about a wine recall for bacterial contamination the way you might for undercooked chicken or improperly stored dairy. The organisms that do thrive in spoiled wine, like acetic acid bacteria and certain wild yeasts, produce off-flavors and smells but aren’t the type to cause foodborne illness.
What You Might Actually Feel
The most common side effects of drinking bad wine are headaches, nausea, flushing, and stomach discomfort. These reactions often come down to compounds called biogenic amines, particularly histamine and tyramine, which build up in wine over time and especially in bottles that have been stored improperly. Poor preservation encourages bacteria with high enzyme activity to produce more of these compounds.
In one study, subjects who consumed wine with elevated histamine levels developed headaches, facial flushing, dizziness, nausea, and changes in blood pressure roughly three hours after drinking. Some experienced abdominal cramps and diarrhea. These symptoms typically last a few hours and resolve on their own. People with a genetic predisposition to low levels of the enzyme that breaks down histamine are especially vulnerable, and for them even modest amounts of these compounds can trigger reactions that mimic an allergic response: itching, hives, or even mild asthma symptoms.
Alcohol and other compounds in the wine can lower the threshold at which histamine causes problems, meaning you might tolerate the same amount of histamine in food but react to it in wine. This is one reason wine is frequently blamed for headaches more than other alcoholic drinks.
Oxidized Wine and That Vinegar Taste
If your wine smells sharp and tastes like vinegar, it has been exposed to too much oxygen. Acetic acid bacteria convert the alcohol into acetic acid, the same compound that gives vinegar its bite. A slightly oxidized wine will taste flat and dull. A heavily oxidized one will smell like nail polish remover or vinegar.
Oxidized wine also contains higher levels of acetaldehyde, a compound your body normally produces as it metabolizes alcohol. In larger amounts, acetaldehyde triggers the release of histamine and stress hormones, leading to facial flushing, rapid heartbeat, drops in blood pressure, headaches, and nausea. These are the same symptoms people with alcohol sensitivity experience, because that sensitivity is itself caused by a buildup of acetaldehyde in the blood. So drinking oxidized wine essentially amplifies the worst parts of a hangover while you’re still drinking.
A glass of mildly oxidized wine is not dangerous. It just tastes bad and may leave you feeling worse than a glass of fresh wine would. You’re not going to end up in the emergency room, but you might wish you’d poured it down the drain.
Cork Taint: Unpleasant but Harmless
Wine that smells like wet cardboard or a musty basement is almost certainly “corked,” meaning it has been contaminated with a chemical compound that forms when natural fungi interact with chlorine-based sanitizers used in winemaking. This compound is detectable by trained tasters at concentrations as low as 3 to 4 parts per trillion, which is extraordinarily small. Despite its powerful effect on flavor and aroma, it is not toxic to humans at the levels found in wine. A corked bottle is a waste of money, not a health risk.
How to Spot Wine That Has Turned
Your nose is the best tool. Wine that has gone bad typically announces itself before you take a sip. A sharp, vinegary smell means oxidation. A musty, damp cardboard odor signals cork taint. A smell like sauerkraut or rotten eggs suggests other microbial activity.
Visually, a few things can tip you off. Small crystals at the bottom of the bottle or clinging to the cork are harmless tartrate deposits, sometimes called “wine diamonds.” They look like tiny shards of salt or glass and are completely safe. What you want to watch for instead is haziness or cloudiness, which in white wines can indicate protein instability or microbial contamination. Unexpected fizziness in a wine that shouldn’t be sparkling suggests refermentation by yeast, which can also push corks partially out of the bottle. A red wine that has turned brown or a white wine that has gone deep amber has likely oxidized significantly.
Can You Cook With Bad Wine?
Cooking with wine that has simply gone flat or slightly stale is perfectly fine. Heat evaporates most of the alcohol and concentrates the remaining flavors, and the subtle nuances that matter in wine drinking don’t survive the cooking process anyway. A bottle that has been open in the fridge for a week or two can still add good flavor to a sauce, braise, or risotto.
The exception is wine with cork taint or strong vinegar-like sourness. Cooking concentrates flavors, which means those off-putting characteristics get amplified rather than hidden. If a wine smells musty or has turned aggressively sour, it will make your food taste the same way. A quick sniff before you pour it into the pan saves you from ruining a dish.
Keeping Open Wine Fresh Longer
Once you pull the cork, oxygen starts breaking wine down. Most opened bottles of wine stay drinkable for three to five days in the refrigerator, with reds lasting toward the shorter end and whites and rosés holding up a bit longer because they’re served cold. Resealing with the original cork or a stopper is the bare minimum.
Vacuum pumps that pull air out of the bottle help slow oxidation. Inert gas sprays, which blanket the wine’s surface with nitrogen or argon, are even more effective because they physically displace the oxygen in the headspace above the wine. Neither method will keep wine fresh indefinitely, but both can buy you several extra days before the flavor noticeably declines. The simplest approach: if you know you won’t finish a bottle, pour the leftover wine into a smaller container so there’s less air in contact with the liquid.