No supplement, pill, or pre-drinking ritual has been proven to fully prevent a hangover. A review of 82 commercially available hangover products found zero with peer-reviewed human data demonstrating efficacy. That said, a handful of strategies have shown partial benefits in clinical trials, and some basic choices about what you eat, drink, and avoid can meaningfully reduce how rough the next morning feels.
Why Hangovers Happen in the First Place
Your liver breaks down alcohol in two steps. First, it converts ethanol into acetaldehyde, a toxic compound that’s the primary driver of hangover symptoms. Then a second enzyme converts acetaldehyde into harmless acetic acid. When you drink faster than that second step can keep up, acetaldehyde accumulates and triggers nausea, headache, and fatigue.
That’s not the whole picture, though. Alcohol also triggers inflammation, raising levels of C-reactive protein (a key inflammatory marker) by about 50% and doubling cortisol. It disrupts sleep architecture, dehydrates you by suppressing the hormone that tells your kidneys to retain water, and irritates the stomach lining. A hangover isn’t one problem. It’s several happening at once, which is why no single remedy addresses all of it.
Eat a Real Meal Before You Drink
The single most effective thing you can do before drinking is eat a substantial meal. Food in your stomach slows the rate at which alcohol reaches your small intestine, where most absorption happens. This tapers the spike in blood alcohol to a pace your liver can manage more easily. The best options combine protein, fat, and carbohydrates: a burger with fries, a burrito with cheese and beans, salmon with rice, or an egg and cheese sandwich. A salad alone won’t do much. You want calorie-dense food that sits in your stomach for a while.
Choose Lower-Congener Drinks
Congeners are chemical byproducts of fermentation and aging. They give dark spirits their color and flavor, but they also compete with ethanol for processing in your liver. When your body is busy breaking down congeners, alcohol and its toxic byproducts linger longer. Congeners also stimulate stress hormones like norepinephrine, which fuel the inflammatory response behind fatigue and malaise.
The differences are dramatic. Brandy contains up to 4,766 milligrams of methanol per liter, while beer has just 27. Rum packs as much as 3,633 milligrams per liter of the congener 1-propanol; vodka has anywhere from zero to 102. The general ranking from most to fewest congeners: brandy, red wine, and rum at the top; whiskey, white wine, and gin in the middle; vodka and beer at the bottom. If you’re trying to minimize next-day misery, lighter-colored drinks are a safer bet.
Supplements With Some Evidence
Red Ginseng
A randomized crossover study in 25 healthy men found that a red ginseng drink taken alongside alcohol significantly lowered blood alcohol levels at 30, 45, and 60 minutes compared to a placebo. Participants also reported reduced hangover severity. The mechanism appears to involve faster clearance of alcohol from the bloodstream. This is one of the better-designed small trials in the hangover space, though 25 people is still a small sample.
Prickly Pear Extract
In a double-blind, placebo-controlled trial of 64 adults, prickly pear cactus extract taken five hours before drinking reduced the risk of severe hangover by 50%. It specifically helped with nausea, loss of appetite, and dry mouth. Headache, dizziness, and weakness were no different from placebo. The extract appeared to work by lowering C-reactive protein levels back to baseline, counteracting the inflammatory surge caused by alcohol. It’s not a cure-all, but if nausea is your worst symptom, it may be worth trying.
Zinc and Vitamin B3 (Niacin)
A study analyzing dietary nutrient intake found that higher levels of zinc and niacin were linked to less severe hangovers. Notably, vitamins B6 and B12, which are staples in many hangover supplements marketed as energy boosters, showed no statistically significant benefit. If you’re picking a supplement, look for one that includes zinc and niacin rather than relying on a generic B-complex.
NAC (N-Acetyl Cysteine)
NAC is a popular recommendation in online wellness circles because it supports glutathione production, your liver’s main antioxidant defense. The theory makes biochemical sense. In practice, a clinical trial using 1.2 grams of NAC before drinking and another 1.2 grams after found it ineffective at alleviating hangover symptoms from binge drinking. NAC may have a role at different doses or timing, but the current human evidence doesn’t support it as a reliable hangover preventive.
DHM (Dihydromyricetin)
DHM, extracted from the Japanese raisin tree, is the active ingredient in many trendy hangover supplements. Animal studies suggest it speeds up alcohol metabolism and reduces GABA rebound effects. However, the majority of products containing DHM don’t even report their dosage, and no tolerable upper limit has been established. There’s currently no peer-reviewed human data confirming it works. It might, but you’re essentially experimenting on yourself.
What to Avoid Taking
Acetaminophen (Tylenol) is a common instinct for a pounding headache, but it’s a poor choice after heavy drinking. Both alcohol and acetaminophen are processed through the liver, and combining them increases the risk of liver damage. The FDA specifically warns people who drink three or more alcoholic beverages a day to talk to a doctor before using it. If you need a painkiller, ibuprofen is generally a better option, though it can irritate an already-sensitive stomach.
Skip the “hair of the dog” approach. Drinking more alcohol the next morning delays the hangover rather than preventing it, and it sets up a cycle that can lead to dependence over time.
Hydration and Electrolytes
Alcohol suppresses your body’s antidiuretic hormone, which is why you urinate far more than the volume of liquid you’re drinking. This leads to dehydration, electrolyte loss, and the classic dry mouth and headache. Alternating each alcoholic drink with a glass of water won’t eliminate a hangover, but it reduces the dehydration component. Drinking an electrolyte beverage before bed helps replace lost sodium and potassium.
The key is volume and timing. Chugging water right before sleep is better than nothing, but spacing it throughout the night is more effective because your body can only absorb water so fast.
A Practical Pre-Drinking Checklist
- Two to three hours before: Eat a full meal with protein, fat, and carbs.
- Five hours before (if using it): Take prickly pear extract, based on the trial dosing window.
- Choose your drinks: Stick to vodka, beer, white wine, or gin over brandy, rum, or red wine.
- While drinking: Alternate alcoholic drinks with water. Sip, don’t chug.
- Before bed: Drink an electrolyte beverage and another full glass of water.
- Next morning: Eat easily digestible food and continue rehydrating. Avoid acetaminophen.
None of this guarantees a symptom-free morning. The only reliable way to avoid a hangover is to drink less, drink slowly, and stay well below the threshold where acetaldehyde overwhelms your liver’s ability to clear it. Everything else is damage reduction.