There is no proven cure for a hangover. Despite dozens of supplements, pills, and folk remedies on the market, not a single one has been validated in high-quality clinical trials. A 2022 systematic review of 21 placebo-controlled studies found that every piece of evidence for every intervention tested rated as “very low quality,” and no two studies even looked at the same treatment, making it impossible to confirm any results. What you can do is manage individual symptoms, speed your body’s recovery with basic care, and make smarter choices before you drink.
Why Hangovers Happen
A hangover is not just dehydration, though that plays a role. Your liver breaks alcohol down into a toxic compound called acetaldehyde before converting it into harmless acetic acid. When you drink more than your liver can process efficiently, acetaldehyde builds up in your bloodstream and damages cells. At the same time, alcohol triggers an immune response: levels of inflammatory signaling molecules rise in proportion to how much you drank, and their concentration the next morning directly correlates with how miserable you feel.
Add to that disrupted sleep architecture, irritation of your stomach lining, drops in blood sugar, and the loss of fluids and electrolytes through increased urination, and you get the full constellation of headache, nausea, fatigue, brain fog, and anxiety. Symptoms typically begin as your blood alcohol level drops toward zero, peak around 14 hours after your last drink, and last an average of about 18 hours from the time you stop drinking. For most people, that means roughly 12 hours of feeling rough after waking up.
What Actually Helps the Morning After
Since no single remedy eliminates a hangover, the practical strategy is to address the biggest contributors: dehydration, inflammation, low blood sugar, and poor sleep.
Water and electrolytes. Alcohol suppresses the hormone that tells your kidneys to retain water, so you lose more fluid than you take in. Drinking water or an electrolyte beverage (sports drinks, coconut water, oral rehydration solutions) replaces what you lost and can ease headache and dizziness. Sipping steadily through the morning is more effective than downing a liter at once.
Food. Your blood sugar drops after heavy drinking, which contributes to shakiness, fatigue, and irritability. A meal with carbohydrates and some protein helps stabilize glucose levels. Toast, eggs, oatmeal, or bananas are all reasonable options. There’s no magic “hangover food,” but eating something bland is better than eating nothing, especially if your stomach is sensitive.
Sleep. Alcohol fragments your sleep cycles, cutting into the deep and REM stages your brain needs to recover. If your schedule allows it, sleeping longer the next morning does more measurable good than most supplements.
Pain Relievers: What’s Safer
Reaching for a painkiller is one of the most common hangover responses, but the choice matters. Acetaminophen (Tylenol) is processed by the same liver pathways that handle alcohol. In regular heavy drinkers, the risk of liver damage from acetaminophen increases even when taken shortly after alcohol has cleared the body. For occasional drinkers the risk is lower, but mixing the two is still worth avoiding.
Ibuprofen and aspirin reduce inflammation, which is a real component of hangover misery. However, both irritate the stomach lining, and alcohol has already done exactly that. Lab research has shown that ibuprofen and alcohol together can produce synergistic liver stress, amplifying toxicity beyond what either would cause alone. If you choose to take an anti-inflammatory, do so with food and water, keep the dose low, and make sure enough time has passed that alcohol is no longer in your system.
Supplements and “Hangover Products”
The supplement market is flooded with hangover pills and powders. A review of 82 commercial hangover products found the most common ingredients were B vitamins, vitamin C, milk thistle extract, dihydromyricetin (DHM), and N-acetyl L-cysteine (NAC). Not one of those 82 products had peer-reviewed human data demonstrating it worked. Many didn’t even disclose the dose of their active ingredients: 59% of products containing DHM and 73% containing NAC left the amount off the label.
L-cysteine is one of the more interesting candidates. It’s a building block of glutathione, your body’s main antioxidant, and it binds directly to acetaldehyde. One placebo-controlled trial found that a 1,200 mg dose reduced nausea and headache, while a 600 mg dose helped with stress and anxiety. But this is a single study, and it used L-cysteine combined with vitamins, so isolating the effect is difficult. The evidence is suggestive, not conclusive.
Other substances that showed small benefits in individual studies include clove extract, red ginseng, Korean pear juice, and an extract from the Japanese raisin tree (Hovenia dulcis). Each had a single positive trial. None have been replicated. Treat any supplement marketed as a hangover cure with healthy skepticism until stronger evidence appears.
What You Drink Matters
Not all alcoholic drinks produce equally bad hangovers. Darker spirits like bourbon, whiskey, and red wine contain far more congeners, the complex byproducts of fermentation and aging, including acetone, tannins, and additional acetaldehyde. Bourbon contains roughly 37 times the congeners found in vodka. In controlled studies, participants who drank bourbon reported significantly worse hangovers than those who drank the same amount of alcohol as vodka, even though their blood alcohol levels and cognitive impairment were identical.
Choosing lighter-colored, lower-congener drinks (vodka, gin, light beer, white wine) won’t prevent a hangover if you drink enough, but it reduces one layer of toxicity your body has to process.
Prevention Strategies That Work Better Than Cures
The most effective “cure” is really prevention. Slowing your drinking rate gives your liver time to metabolize each dose before the next one arrives. Most adults clear roughly one standard drink per hour, so spacing drinks out and alternating with water keeps blood alcohol from spiking as high.
Eating a substantial meal before or during drinking slows alcohol absorption. Fat and protein are especially effective at delaying the rate alcohol enters your bloodstream. This won’t prevent intoxication entirely, but it smooths out the curve and reduces the acetaldehyde spike that drives next-day misery.
Drinking water between alcoholic drinks addresses dehydration in real time rather than trying to fix it retroactively. Even one glass of water for every two drinks makes a noticeable difference for most people. And stopping earlier in the evening gives your body more time to process alcohol before sleep, improving both sleep quality and how you feel when the alarm goes off.
The Honest Bottom Line
Your body clears a hangover on its own, typically within 12 to 23 hours. Nothing available today has been proven to meaningfully shorten that window. What you can do is reduce the severity: hydrate, eat, sleep, choose lower-congener drinks, pace yourself, and be cautious with painkillers. The gap between what the hangover industry promises and what science has actually confirmed is enormous. Until that changes, time, water, and moderation remain the closest things to a cure.