The most reliable way to avoid a hangover is to drink less alcohol, but several evidence-based strategies can significantly reduce how rough you feel the next morning. Hangovers result from a chain reaction: dehydration, inflammation, poor sleep, and the buildup of toxic byproducts your liver produces while breaking down alcohol. Targeting each of these mechanisms gives you the best chance of waking up feeling human.
Why Hangovers Happen
When your liver processes alcohol, it first converts it into acetaldehyde, a compound far more toxic than alcohol itself. Acetaldehyde triggers your body’s inflammatory response, stimulating the production of the same immune signaling molecules (called cytokines) that make you feel achy and fatigued when you’re sick. That headache, nausea, and general misery the next day are, in large part, your immune system reacting to a mild poisoning.
At the same time, alcohol suppresses the hormone that tells your kidneys to retain water. The result: you urinate significantly more than you would from drinking the same volume of a non-alcoholic beverage. One early estimate put the extra urine output at roughly 100 ml for every standard drink, meaning four drinks could cost you an additional 320 ml of fluid on top of normal losses. That fluid loss pulls electrolytes with it, contributing to the headache and dizziness you feel the next day.
Pace Yourself and Eat Before Drinking
Your liver clears alcohol at a relatively fixed rate, roughly one standard drink per hour for most people. Drinking faster than that lets acetaldehyde pile up faster than your body can handle it. Spacing your drinks out, ideally with a glass of water between each one, is the single most effective harm-reduction strategy besides drinking less overall.
Food in your stomach slows alcohol absorption, which flattens the spike in blood alcohol and gives your liver more time to keep up. Meals rich in fat and protein are especially effective at slowing gastric emptying. Eating before and during drinking won’t prevent a hangover if you overdo it, but it meaningfully lowers the peak toxin load your body has to process.
Choose Lower-Congener Drinks
Congeners are chemical byproducts of fermentation and aging that give darker spirits their color and flavor. Bourbon, red wine, and brandy are high in congeners. Vodka and other clear spirits contain almost none. In controlled studies, bourbon produced noticeably more severe hangover ratings than vodka at the same alcohol dose. That said, the alcohol itself was still the dominant factor. Switching to vodka won’t save you if you drink twice as much of it.
Hydrate Strategically
The classic advice to “drink water” is correct but undersold. Because alcohol actively suppresses your water-retention hormone, you’re losing fluid at an accelerated rate the entire time you’re drinking. Waiting until you get home to chug a glass of water means you’ve already been running a deficit for hours.
A better approach: alternate each alcoholic drink with a full glass of water throughout the night. Before bed, drink another large glass along with an electrolyte source, whether that’s a sports drink, coconut water, or an electrolyte packet. Replacing sodium and potassium alongside the water helps your body actually retain the fluid rather than just passing it through.
Protect Your Sleep
A hangover isn’t just chemical. It’s also the result of terrible sleep. Alcohol suppresses REM sleep, the deep, restorative phase your brain needs to recover. Research shows this disruption begins at doses as low as two standard drinks (roughly 0.50 grams of alcohol per kilogram of body weight) and gets progressively worse with more alcohol.
You can’t fully prevent this effect, but you can minimize it by finishing your last drink well before bedtime. It takes about one hour per drink for your blood alcohol to drop meaningfully. If you have four drinks, stopping at least three to four hours before sleep gives your body time to clear enough alcohol that your later sleep cycles are less disrupted. This single change often makes the biggest difference in how you feel the next morning.
Supplements That May Help
A few supplements have some research support, though none are magic bullets.
- N-acetylcysteine (NAC): This amino acid derivative helps your body produce glutathione, the primary antioxidant your liver uses to neutralize acetaldehyde. Timing matters here. A mouse study found that NAC given 30 minutes before alcohol exposure protected the liver from damage, but NAC given four hours after alcohol actually worsened liver oxidative stress in a dose-dependent manner. If you’re going to try it, take it before you start drinking, not after.
- Vitamin B6: One study found that 1,200 mg of pyritinol (a form of vitamin B6) significantly reduced the number of hangover symptoms participants reported, though severity per symptom wasn’t measured.
- Red ginseng: A randomized crossover study in healthy men found that a red ginseng drink reduced self-reported nausea scores from 1.00 to 0.56 on a 0-to-4 scale compared to a control group. Headache scores dropped modestly as well, from 1.32 to 1.04.
- Dihydromyricetin (DHM): Derived from the Japanese raisin tree, DHM has shown promise in animal studies for reducing alcohol withdrawal symptoms like anxiety and hyperexcitability. It appears to work by modulating the same brain receptors that alcohol acts on. Human clinical data is still limited, but DHM supplements are widely available and have become popular in hangover prevention products.
What Doesn’t Work
Coffee the next morning will make you feel more alert, but caffeine does not speed up alcohol metabolism at all. Studies confirm that adding caffeine to alcohol does not change breath alcohol concentration. You’re just a more awake version of hungover. The same goes for “sweating it out” at the gym or in a sauna. Your liver clears alcohol at its own fixed pace regardless of your activity level, and exercising while dehydrated can make things worse.
“Hair of the dog,” or drinking more alcohol the next morning, temporarily masks symptoms by re-suppressing the rebound excitability in your nervous system. But it simply delays and extends the hangover while adding more toxic load for your liver to process. It’s a strategy that, repeated over time, also happens to be a hallmark of alcohol dependence.
A Practical Pre-Drinking Checklist
- Eat a full meal with fat and protein before your first drink.
- Take any supplements (NAC, B6) before you start drinking, not after.
- Alternate every drink with a glass of water.
- Stick to lighter-colored spirits or drinks lower in congeners when possible.
- Set a cutoff time at least three to four hours before you plan to sleep.
- Before bed, drink water with electrolytes and have a small snack ready for the morning.
None of these steps will fully eliminate a hangover if you drink heavily. But combining several of them, especially pacing, hydration, food, and an early cutoff, can be the difference between a lost day and a mildly sluggish morning.