You can’t instantly stop a hangover once it’s underway, but you can shorten and soften it with the right timing. Hangover symptoms peak when your blood alcohol level drops back to zero, and they can persist for 24 hours or longer. The most effective strategies work before and during drinking, not the morning after. What follows is a practical breakdown of what actually helps, what doesn’t, and why your body feels the way it does.
Why Hangovers Happen
Your liver breaks down alcohol in two steps. First, it converts alcohol into acetaldehyde, a toxic compound and known carcinogen. Then it converts acetaldehyde into acetate, which is relatively harmless. The problem is that acetaldehyde, even though it’s short-lived, is potent enough to cause tissue damage while it lingers. Small amounts of it also form directly in the gut and brain, which helps explain why hangovers affect your stomach, your head, and your ability to think clearly at the same time.
Beyond acetaldehyde, alcohol irritates your stomach lining, suppresses a hormone that helps your kidneys retain water (which is why you urinate so much), and disrupts your sleep architecture. Your immune system also mounts a mild inflammatory response. The combined result is the familiar package: headache, nausea, fatigue, brain fog, and dehydration. During a hangover, your attention, decision-making, and muscle coordination are all measurably impaired. Recovery requires your body to clear toxic byproducts, rehydrate, heal irritated tissue, and restore normal immune and brain activity.
What to Do Before You Drink
Eating a substantial meal before drinking is the single most reliable way to reduce hangover severity. Food slows the rate at which alcohol enters your bloodstream, giving your liver more time to process each wave of acetaldehyde rather than getting overwhelmed. A meal with fat, protein, and complex carbohydrates works best because it empties from the stomach slowly.
There’s limited but interesting evidence around Korean pear juice. One study found it may promote the activity of the enzymes your liver uses to break down alcohol, but only when consumed before you start drinking. It did not produce a statistically significant reduction in blood acetaldehyde levels compared to a placebo, though, and its effects appear to vary based on your genetics. It’s not a magic bullet, but drinking a glass before going out is low-risk if you want to try it.
What to Do While Drinking
Pace and hydration matter more than any supplement. Alternating each alcoholic drink with a glass of water slows your intake and offsets some of the fluid loss from alcohol’s diuretic effect. Aim for at least one glass of water per drink, and have another full glass before bed.
Your choice of drink also plays a role. Alcoholic beverages contain byproducts of fermentation called congeners, and these compounds worsen hangovers independently of the alcohol itself. Brandy, red wine, and dark rum have the highest congener levels. Brandy, for instance, contains roughly 4,766 milligrams per liter of methanol (one type of congener), while beer has about 27 milligrams per liter. A controlled study found that participants who drank bourbon, which is high in congeners, reported significantly worse hangovers than those who drank vodka in equal amounts. If you’re trying to minimize the aftermath, sticking to vodka, light beer, or gin is a practical choice.
Eating while you drink helps, too. Snacking keeps food in your stomach, which continues to slow alcohol absorption. Foods rich in the amino acid L-cysteine, like oatmeal, pork, and tuna, support liver detoxification. One cup of oatmeal provides about 227 milligrams of L-cysteine. That said, you’d need multiple servings to approach the doses used in studies, so think of it as a helpful addition rather than a cure.
What to Do the Morning After
If the hangover has already arrived, your options are mainly about comfort and damage control. Your body needs time to finish clearing acetaldehyde, and nothing can speed that process up dramatically.
Start with fluids. Water is the baseline, but drinks with electrolytes (sports drinks, broth, coconut water) help replace sodium and potassium lost through alcohol-induced urination. Sipping rather than gulping is easier on a queasy stomach. Eating bland, easy-to-digest food gives your body glucose it has likely depleted and helps settle nausea. Toast, crackers, bananas, and rice are all reasonable choices.
For headache and body aches, ibuprofen or aspirin can help, but use them cautiously. Both are harder on the stomach lining, which alcohol has already irritated. Acetaminophen (Tylenol) is generally considered safer for the stomach, but it’s processed by the liver, the same organ that’s busy handling alcohol’s toxic byproducts. At proper doses, acetaminophen is safe for most people, but overdose is the most common cause of acute liver failure. If you take it, stick well below the daily limit and don’t combine it with more alcohol.
Sleep is genuinely restorative here. Alcohol disrupts your sleep cycles, so even if you slept for eight hours, you likely didn’t get quality rest. A nap gives your brain and body a real chance to recover.
What Doesn’t Work
“Hair of the dog,” or drinking more alcohol the next morning, is one of the most persistent hangover myths. It temporarily masks symptoms by putting alcohol back into your system, but it doesn’t cure anything. A hangover develops as your blood alcohol concentration falls sharply. Drinking again simply delays that drop. The symptoms will return, often worse, once you stop again.
Hangover supplement products are another area where marketing runs far ahead of science. A review of 82 commercially available hangover products found no peer-reviewed human data demonstrating either safety or efficacy for any of them. The most common ingredients in these products are B vitamins, vitamin C, milk thistle extract, dihydromyricetin (DHM), and N-acetyl L-cysteine (NAC). Many don’t even report their ingredient doses on the label: 59% of products containing DHM and 73% containing NAC left the dosage unlisted. Without knowing what’s in the bottle or whether it works, these products are essentially a gamble.
Coffee can help with the headache if you’re a regular caffeine drinker (caffeine withdrawal compounds the headache), but it’s also a mild diuretic that can worsen dehydration. If you drink it, match it with extra water.
How Long Recovery Takes
Hangover symptoms peak when blood alcohol returns to zero, which for most people is several hours after the last drink. From that peak, symptoms can last a full 24 hours or longer depending on how much you drank, your body size, your genetics, and whether you ate or hydrated along the way. Most people feel significantly better by the 12- to 16-hour mark if the hangover was moderate.
There is no shortcut past the timeline. Your liver processes alcohol at a fixed rate, roughly one standard drink per hour, and no supplement, food, or remedy changes that. The strategies above reduce the total damage your body sustains, which shortens the tail end of recovery. But the only way to reliably prevent a hangover is to drink less, drink slowly, and give your body what it needs (food, water, rest) before, during, and after.