How to Prevent a Hangover: What Actually Works

The honest headline first: if you drink enough, you cannot fully prevent a hangover — the only guaranteed way to avoid one is to not drink, or to drink very little. What you can do is meaningfully reduce how bad the next day feels, and the levers that work are mostly unglamorous. This guide ranks them by how much evidence is actually behind them, covers the timing questions people ask (“before bed,” “the night before,” “after drinking”), and is honest about what doesn’t work.

These statements have not been evaluated by the Food and Drug Administration or Health Canada. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before use.

The short version

A hangover is your body’s response to the amount of alcohol it had to process and everything that came with it — disrupted sleep, dehydration, inflammation, the byproducts of alcohol metabolism, and a rebound in nervous-system activity once the alcohol clears. There’s no single switch that turns all of that off. So “prevention” really means reduction: shrinking the size of the insult and supporting the basics (sleep, fluids, food) so the morning is less rough.

The single biggest lever is the least exciting one: how much you drink, and how fast. Everything else is a rounding error next to that. For the full picture of why the morning feels the way it does, see what actually causes a hangover.

The levers that actually work (ranked by evidence)

1. Drink less, and more slowly

Hangover severity scales with how much alcohol your body had to process and how high your blood alcohol peaked. Fewer drinks, spread over more time, means a lower peak and a smaller cleanup job. Alternating alcoholic drinks with water, and simply slowing the pace, are the highest-leverage moves available — more than any pill, powder, or trick. Nothing else on this list comes close.

2. Eat before and while you drink

Food in your stomach slows alcohol absorption, which lowers and flattens the blood-alcohol peak. It doesn’t reduce the total alcohol processed, but a gentler curve tends to mean a gentler morning, and eating also steadies blood sugar (dips in which make you feel worse). This is well-supported and easy. More detail in what to eat before drinking.

3. Hydrate — with electrolytes, not just water

Alcohol suppresses the hormone that tells your kidneys to hold onto water, so you lose more fluid than you take in, along with electrolytes (magnesium among them). Rehydrating won’t undo a hangover on its own — dehydration is only part of the picture — but being dehydrated on top of everything else makes it worse, and it’s avoidable. A glass of water between drinks and again before bed is the practical version. See a hydration strategy for drinking.

4. Protect your sleep

Alcohol helps you fall asleep but fragments the second half of the night and suppresses REM, so you wake under-rested even after a full night in bed. Poor sleep independently worsens next-day mood, focus, and next-day anxiety. You can’t fully fix alcohol-disrupted sleep, but an earlier last drink, a dark cool room, and not stacking a 5am alarm on top all help.

5. Mind the congeners (this is the “wine hangover” question)

Darker drinks — red wine, whiskey, brandy, dark rum — contain more congeners, byproducts of fermentation and aging that several studies associate with worse hangovers than clear spirits at the same alcohol dose. If red wine reliably wrecks you, this is likely part of why; lighter-coloured drinks tend to be gentler, dose for dose. It’s a real effect, but a secondary one — the amount still matters far more than the colour.

6. Have a plan before you drink, not just after

Most of what works is set up before the first drink: eat, hydrate, decide your pace, and pick your drinks. A simple routine beats trying to rescue the situation at 2am. See our pre-drinking protocol for a practical version.

7. Supplements — one lever, not the answer

Supplements are the noisiest and least-proven item on this list, so it’s worth being clear-eyed. The recovery category is built largely around DHM (dihydromyricetin), a flavonoid from the Hovenia dulcis tree that researchers study for its interaction with the GABA-A receptor system and the enzymes involved in alcohol metabolism. The most-cited work is a 2012 UCLA study in The Journal of Neuroscience, done in rodents.

Here’s the honest read: this evidence is mostly preclinical, and no product has been shown in robust human trials to prevent hangovers. A supplement is, at best, one lever layered on top of the basics — never a substitute for drinking less. If you’re curious about the compound, read our complete guide to DHM and the honest rundown of supplements people take before drinking, both of which stay on the right side of what the research actually shows.

Timing: when to do what

People search this by moment, so here’s the same advice mapped to the clock.

When	What actually helps
Before drinking	Eat a real meal; pre-hydrate; decide your pace and your drinks. This is the highest-value window.
The night before (planning ahead)	There’s no meaningful “pre-loading” you can do days out — it comes down to the choices you make once you start. Get a good night’s sleep beforehand so you’re not starting depleted.
While drinking	Alternate with water; keep eating; slow down; favour lighter-coloured drinks.
Before bed	A glass or two of water and an electrolyte source; set yourself up to sleep in (no early alarm if you can help it). Don’t rely on a nightcap — more alcohol before bed makes sleep worse, not better.
After drinking / next morning	Rehydrate, eat something, and give it time. The morning is damage-limitation, not prevention — the levers that prevent were all upstream.

Note the pattern: almost everything that works happens before or during drinking. By the time you’re searching “how to prevent a hangover” at midnight, most of the prevention window has closed — which is exactly why having a routine matters.

What doesn’t work (skip these)

“Hair of the dog.” More alcohol delays the rebound rather than resolving it, and restarts the cycle. It can briefly mask symptoms, which is not the same as helping.
Greasy food the morning after. Fatty food before drinking can slow absorption; after the fact it mostly just sits there. The timing is the whole point.
“Sweating it out” / saunas. Alcohol is cleared by your liver at a fixed rate; exercise and heat don’t speed that and can deepen dehydration.
Coffee. It can make you feel more alert but does nothing for the underlying state, and as a mild diuretic it may nudge dehydration the wrong way.
Anything promising to “detox,” “flush,” or “neutralize” alcohol. Your liver does the processing at its own pace; no supplement or drink changes that, and claims that say otherwise are a red flag.

A note on “natural” prevention

There’s no exotic secret here — the genuinely “natural” way to prevent a hangover is the boring stack: less alcohol, food, water, sleep, and time. Herbal and vitamin products are marketed heavily for this and the evidence for most is thin. Being skeptical of anything that promises to let you drink freely and wake up fine is, itself, good hangover prevention.

Frequently Asked Questions

How do you prevent a hangover before bed? Drink a glass or two of water with an electrolyte source, and set yourself up to sleep in rather than waking to an early alarm. Skip the nightcap — more alcohol before bed fragments sleep and delays the nervous-system rebound rather than preventing it. The before-bed window helps at the margins; the real prevention happened earlier in the night.

How can I prevent a hangover after drinking? Once you’ve stopped, your options narrow to damage-limitation: rehydrate, eat something, and protect your sleep. You can’t undo the alcohol already processed — which is why the levers that prevent (pacing, food, fewer drinks) all live before and during drinking, not after.

How do I prevent a hangover before drinking? Eat a proper meal, pre-hydrate, decide your pace, and favour lighter-coloured drinks. This is the highest-value window — see our pre-drinking protocol.

How do you prevent a wine hangover specifically? Red wine is high in congeners (fermentation byproducts associated with worse hangovers) and easy to over-pour without noticing. Measure your pours, alternate with water, and eat alongside it. Dose for dose, lighter-coloured drinks tend to be gentler — but total amount still matters most.

Can you prevent a hangover naturally? The most effective “natural” approach is the unglamorous one: drink less and more slowly, eat, hydrate, and sleep. There’s no proven natural shortcut that lets you drink heavily and wake up fine, and you should be wary of anything marketed that way.

Does taking a supplement prevent a hangover? No product has been shown in robust human trials to prevent hangovers. Some people add a DHM supplement as one lever on top of the basics because of its studied interaction with alcohol-related pathways, but the human evidence is limited and it’s not a substitute for drinking less. See our DHM guide for the honest version.

Reviewed for accuracy against the cited primary literature. Hovenia is a liver-health supplement company; our product supports healthy liver function and is not intended to diagnose, treat, cure, or prevent any disease. This statement has not been evaluated by the FDA or Health Canada.

Want the honest version in your inbox? We send occasional, no-hype briefings on what the DHM and hangover research actually shows. Join the waitlist → — that’s the main way to follow along. If you’re curious about the product itself, Hovenia is single-ingredient pure DHM, 1,000 mg per serving: see the formula →.