Nothing can sober you up except time. Your liver breaks down alcohol at a roughly fixed pace of about one standard drink per hour, and no food, supplement, or activity can meaningfully speed that up. If you’ve had four drinks, you’re looking at approximately four hours before your blood alcohol level returns to zero. Everything else you’ve heard, from coffee to cold showers, changes how you feel without changing how impaired you actually are.
Why Your Liver Sets the Pace
Over 90% of the alcohol in your system is cleared by a single enzyme found mostly in your gut and liver. That enzyme converts alcohol into a toxic intermediate compound, which a second enzyme then converts into harmless acetate your body can use for energy. Both enzymes work at a relatively constant speed. When there’s more alcohol in your blood than they can handle, the excess just circulates until the enzymes catch up.
The average person’s blood alcohol concentration drops by about 0.015 to 0.020 per hour. To put that in perspective, if you’re at 0.08 (the legal driving limit in most U.S. states), it will take roughly four to five hours to reach 0.00. There’s no shortcut around this biology. If there’s excessive alcohol in the blood, the liver simply cannot accelerate.
Coffee, Cold Showers, and Exercise Don’t Work
These are among the most persistent myths about sobering up, and none of them hold up. The California Department of Alcoholic Beverage Control puts it plainly: a cold shower, fresh air, exercise, or black coffee will not help sober a person up.
Caffeine is the trickiest of these because it does something real, just not the right thing. It can make you feel more alert and give you the impression that alcohol is affecting you less. But the CDC is clear that caffeine does not reduce the effects of alcohol on your body. Your reaction time, coordination, and judgment stay impaired. Feeling awake while still drunk is arguably more dangerous than feeling drunk, because you’re more likely to drive, walk home alone, or make decisions you wouldn’t make if you recognized how impaired you were.
Exercise and cold showers work the same way. They jolt your senses and create a temporary feeling of alertness. Your blood alcohol level doesn’t budge.
Hangover Pills and Supplements
A growing market of “sobering” supplements and hangover pills promises to break down alcohol faster or prevent its effects. The evidence behind them is thin. One small 2022 study on a popular supplement called Myrkl found no effect on cognitive function after drinking. The study did observe slightly less alcohol absorption after a week of taking the supplement, but the sample was small and limited to one demographic group.
Some of these products contain probiotics that can start to break down alcohol in the digestive tract. But since about 90% of alcohol metabolism happens in the liver, not the gut, the benefit is minimal. In 2020, the FDA warned several hangover pill companies for illegally selling unapproved products, noting that consumers may get the false impression that these products can prevent health problems caused by excessive drinking. Dietary supplements are not a substitute for limiting alcohol consumption.
Why You Feel Sober Before You Actually Are
This is one of the most important and least understood aspects of drinking. Research comparing people’s self-rated intoxication against their measured blood alcohol levels found that subjective feelings of drunkenness return to baseline well before blood alcohol does. In other words, you start feeling normal while your BAC is still elevated. The internal cues that tell you you’re drunk fade quickly on the way down, even as measurable impairment persists.
This gap between feeling sober and being sober is where a lot of bad decisions happen, particularly around driving. If you had your last drink two hours ago and feel fine, your BAC may still be above the legal limit. The only reliable way to know is to count your drinks, note when you stopped, and do the math at roughly one drink per hour.
What Actually Varies From Person to Person
While nobody can speed up alcohol metabolism on demand, the baseline rate does differ between individuals. Women tend to eliminate alcohol from their blood slightly faster than men, at about 0.018 per hour compared to 0.016. This difference disappears when you account for liver size relative to body mass, meaning it’s driven by proportionally larger livers in women rather than any hormonal or enzymatic advantage.
Genetics also play a role. Some people carry gene variants that produce faster-acting versions of the primary alcohol-metabolizing enzyme. These variants are more common in East Asian and some African populations and are associated with a lower risk of alcohol use disorder, likely because the rapid buildup of the toxic intermediate compound makes drinking unpleasant. People with slower enzyme variants, on the other hand, process alcohol more gradually.
Body weight, hydration, and whether you ate before drinking all affect how high your BAC peaks in the first place. Alcohol is absorbed significantly faster on an empty stomach, meaning the same number of drinks produces a higher peak BAC and a longer window of impairment if you haven’t eaten. Eating before or while drinking won’t sober you up, but it slows absorption and keeps your peak BAC lower.
What You Can Do While You Wait
Since time is the only real solution, the practical question is how to make that waiting period safer and more comfortable. Drinking water between alcoholic drinks and before bed helps with dehydration, which contributes to hangover symptoms but doesn’t lower your BAC. Eating a meal slows the absorption of any alcohol still in your stomach. Resting in a safe place keeps you from making impaired decisions.
If you need to drive or do anything requiring sharp coordination, plan around the math. Count your drinks, note when you stopped, and give yourself at least one hour per standard drink before getting behind the wheel. A standard drink is 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of liquor.
Signs That Go Beyond Normal Intoxication
Most of the time, waiting it out is all you need. But alcohol overdose is a medical emergency, and it can happen to anyone who drinks too much too fast. The warning signs include mental confusion or stupor, inability to wake the person up, vomiting, seizures, breathing slower than eight breaths per minute, gaps of 10 seconds or more between breaths, clammy skin, bluish skin color, and extremely low body temperature. A person doesn’t need to show all of these signs to be in danger. If someone is unconscious and cannot be woken up, that alone warrants a call to emergency services.