The only guaranteed way to prevent a hangover is to drink less, but several evidence-based strategies can significantly reduce how rough you feel the next morning. Your liver processes about 7 grams of pure alcohol per hour, roughly one standard drink. Anything beyond that pace creates a backlog of toxic byproducts and triggers an inflammatory response that drives most hangover symptoms.
Why Hangovers Happen in the First Place
A hangover is essentially your body’s inflammatory reaction to alcohol and its byproducts. When your liver breaks down ethanol, the process generates free radicals that damage cells and trigger your immune system to release inflammatory molecules. Blood levels of key inflammation markers, particularly one called C-reactive protein, correlate strongly with hangover severity. The higher the inflammatory response, the worse you feel.
Interestingly, it’s the alcohol itself, not just its breakdown products, that appears to drive much of this inflammation. Research published in the Journal of Clinical Medicine found that blood alcohol concentration was directly associated with elevated inflammatory markers, while acetaldehyde (the intermediate toxin your liver produces) showed no significant correlation with overall hangover severity. This matters because it means the total amount of alcohol your body has to process is the primary driver of how bad tomorrow will be.
Pace Your Drinks to Match Your Liver
Your liver clears roughly one standard drink per hour. A standard drink is 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of spirits. Every drink beyond that rate means alcohol and its byproducts are circulating longer, amplifying the inflammatory cascade.
The simplest high-impact strategy is spacing your drinks. If you’re at a four-hour dinner, keeping to four drinks gives your liver a realistic chance of keeping up. Drinking four drinks in the first hour and then switching to water still means your body spent hours processing a backlog. Pacing matters more than total duration.
Choose Lower-Congener Drinks
Congeners are chemical byproducts of fermentation and aging that contribute to the flavor, color, and aroma of alcoholic beverages. They also make hangovers worse. Darker spirits tend to carry more congeners than lighter ones. Bourbon, for example, can contain up to 60 parts per million of certain phenolic compounds, roughly three times the level found in Scotch malt whisky. Red wine and brandy are also high-congener choices.
If you’re trying to minimize hangover risk, vodka, gin, and lighter beers are generally lower in congeners. This won’t eliminate a hangover if you drink heavily, but when all else is equal, the clearer the drink, the better you’ll typically feel.
Eat Before and During Drinking
Food in your stomach slows the rate at which alcohol enters your bloodstream. This gives your liver more time to process each dose rather than being overwhelmed all at once. A meal containing fat, protein, and complex carbohydrates is ideal because it takes longer to digest, keeping that buffer in place throughout the evening. Drinking on an empty stomach is one of the fastest routes to a severe hangover because it produces a sharp spike in blood alcohol levels and a correspondingly intense inflammatory response.
Snacking while you drink extends this effect. Even small bites between rounds help moderate absorption.
Stay Hydrated, but Be Strategic
Alcohol is a diuretic, meaning it causes your body to expel more fluid than you’re taking in. This contributes to the headache, dry mouth, and fatigue that define a hangover. The classic advice to alternate alcoholic drinks with water works because it both slows your drinking pace and partially offsets fluid loss.
Plain water helps, but adding electrolytes is better. Alcohol increases the loss of sodium, potassium, and other minerals through urine. An electrolyte drink, coconut water, or even a salty snack alongside your water does more to restore what you’re actually losing. Aim for at least one glass of water or electrolyte drink for every alcoholic beverage, and drink a full glass before bed.
Sleep Quality Matters More Than You Think
Alcohol fragments your sleep in ways that directly worsen hangover severity. It suppresses REM sleep, the deep restorative phase your brain needs, and reduces overall sleep efficiency. Research in Nature and Science of Sleep found that people with lower sleep efficiency and less REM sleep after drinking reported significantly worse hangovers and performed more poorly on cognitive tasks the next day.
You can’t fully counteract this effect, but you can avoid making it worse. Stop drinking at least two to three hours before bed to give your body time to clear some alcohol before you sleep. Keep your room cool and dark. And if possible, allow yourself extra time in bed the next morning, since your body will need more total sleep to compensate for the reduced quality.
Supplements That Show Promise
A few natural supplements have some clinical evidence behind them, though none is a magic cure.
- Prickly pear extract: Taken before drinking, it reduced the risk of a severe hangover by roughly half in a clinical trial. Nausea, dry mouth, and loss of appetite all improved significantly. The effect appears tied to its ability to lower inflammation: C-reactive protein levels were 40% higher in participants who took a placebo compared to those who took the extract.
- Red ginseng: A randomized crossover study in 25 healthy men found that a red ginseng drink significantly lowered blood alcohol levels at 30, 45, and 60 minutes after drinking compared to a placebo. Participants also reported milder hangover symptoms, likely because their bodies cleared the alcohol faster.
- N-acetylcysteine (NAC): This amino acid derivative supports your body’s production of glutathione, a key antioxidant involved in neutralizing alcohol byproducts. A clinical trial tested 1.2 grams taken before drinking and another 1.2 grams after, measuring its effect on acetaldehyde levels and oxidative stress. NAC needs to be taken before or during drinking to be useful. Taking it the morning after is too late to meaningfully help.
Replenish B Vitamins
Alcohol disrupts your body’s ability to use and store several B vitamins, particularly B1, B6, B9 (folate), and B12. Even moderate drinking, such as a couple of glasses of wine or spirits, can reduce folate and B12 levels measurably. These vitamins play essential roles in energy metabolism and breaking down the byproducts of alcohol processing.
Taking a B-complex vitamin before drinking or before bed won’t erase a hangover, but it helps replace what alcohol strips away. Eating B-vitamin-rich foods the next morning, like eggs, whole grains, or leafy greens, serves the same purpose.
A Practical Pre-Drinking Checklist
- Eat a full meal with protein, fat, and complex carbs before your first drink.
- Set a pace of no more than one drink per hour.
- Alternate every alcoholic drink with water or an electrolyte beverage.
- Choose lighter-colored drinks when you have the option.
- Consider prickly pear extract or red ginseng before you start.
- Stop drinking at least two to three hours before you plan to sleep.
- Take a B-complex vitamin and drink a full glass of water before bed.
None of these steps alone will prevent a hangover from a heavy night. Combined, they meaningfully reduce the severity because they address different parts of the problem: how fast alcohol hits your system, how much inflammation it triggers, how dehydrated you get, and how well you sleep. The fewer toxic byproducts your body has to fight, and the more resources it has to fight them with, the better your morning looks.