Soju isn’t uniquely harmful compared to other alcoholic drinks, but its smooth taste and low perceived strength make it easy to drink more than you realize. A standard 360ml bottle contains about 270 calories and enough alcohol to equal roughly 3.5 standard drinks, which means finishing one bottle solo puts most people well past moderate drinking territory.
What’s Actually in a Bottle of Soju
Modern soju typically ranges from 16% to 45% ABV, though most popular brands sit around 20%. That places it stronger than wine but weaker than most Western spirits like vodka or whiskey. The distinction matters because people often treat soju like beer at the table, pouring round after round in small cups, while its alcohol concentration is three to five times higher than a typical lager.
A 50ml soju cup (one “shot glass”) at 20% ABV contains roughly half a standard drink. Two cups equal one standard drink. A full 360ml bottle holds about seven shots, so splitting a bottle between two people means each person has consumed nearly two standard drinks. Plain, unflavored soju contains zero sugar and zero carbohydrates. The 270 calories in a full bottle come entirely from the alcohol itself. Flavored varieties, which have surged in popularity, do add sugar and can bump the calorie count higher.
How Soju Affects Your Liver
The biggest long-term risk from regular soju consumption is liver damage, and the data from South Korea paints a clear picture. A large survey of Korean adults found that among people who drank more than two bottles of soju per week, nearly 47% had fatty liver and about 45% showed abnormal liver function tests. Fatty liver is the first stage of alcohol-related liver disease. It’s reversible if you cut back, but if drinking continues at that level, it can progress to inflammation, scarring, and eventually cirrhosis.
Two bottles per week works out to roughly seven standard drinks, which is right at the upper boundary of what most health guidelines consider moderate. The problem is that two bottles a week is a fairly common consumption pattern. The same survey found that 30% of Korean men reported drinking at least that much.
Stomach and Cancer Risk
Alcohol in any form irritates the stomach lining, but the mechanism goes deeper than simple irritation. Your body breaks alcohol down into acetaldehyde, a toxic compound that damages DNA and proteins. Reactive oxygen species produced during this process further promote cell damage. Alcohol also acts as a solvent, helping other carcinogens penetrate your cells more easily.
Research on Korean drinking patterns found that people consuming more than three shots of soju per day showed an elevated risk of stomach cancer, with each shot delivering about 11 grams of alcohol. Heavy drinking also depletes folic acid, a nutrient your body needs for healthy DNA repair. Low folic acid levels have been linked to increased cancer risk on their own, so the combination of direct cell damage and nutrient depletion compounds the problem.
Women face disproportionate risk here. Women’s bodies contain less water than men’s, which means the same amount of alcohol produces a higher blood alcohol concentration. Women also have lower levels of the enzyme that breaks down alcohol in the stomach. In one study, women consuming 20 grams or more of alcohol per day (roughly two soju shots) had a stomach cancer risk more than five times higher than non-drinkers. For men, the significant threshold was double that, at 40 grams per day.
Why Soju Hangovers Can Be Unpredictable
Congeners are byproducts of fermentation and distillation that contribute to a drink’s flavor and color. They also make hangovers worse. Methanol is one of the most significant congeners, and research has found a direct correlation between methanol levels in the body and subjective hangover severity the following day. Darker spirits like bourbon and whiskey contain far more congeners than clear spirits.
Soju, as a clear spirit, is relatively low in congeners, which should theoretically mean milder hangovers. In practice, though, the social ritual of drinking soju, with its constant pouring and toasting, often leads people to consume more total alcohol than they would with a slower-sipped drink. The hangover you get from four standard drinks of soju will be worse than two standard drinks of whiskey, regardless of congener levels. Volume matters more than congener content for most people.
How Much Is Too Much
The most recent U.S. Dietary Guidelines (2025-2030) stopped giving a specific daily number and simply advise Americans to “consume less alcohol for better overall health.” Previous editions recommended no more than one drink per day for women and two for men. Using the old benchmarks as a rough guide, that translates to about two soju shots for women and four for men as a daily ceiling, well under half a bottle.
A practical way to think about it: if you’re splitting a bottle of soju with a friend over dinner, you’re each having a moderate amount. If you’re finishing a bottle on your own, you’ve had roughly 3.5 standard drinks in one sitting, which crosses into binge drinking territory for most women and approaches it for most men. If this happens once in a while, the acute risk is a rough morning. If it’s a weekly pattern, you’re in the range where liver damage, nutrient depletion, and elevated cancer risk become real concerns.
Soju vs. Other Alcohol
There’s nothing in soju that makes it more dangerous than an equivalent amount of alcohol from wine, beer, or whiskey. The health effects are driven by ethanol, and ethanol is ethanol regardless of the bottle it comes in. What makes soju a particular concern is the mismatch between how it’s perceived and how strong it actually is. It goes down smoothly, it’s served in tiny cups, and drinking culture encourages keeping pace with the group.
If you drink soju and want to minimize harm, the most effective strategy is simply counting your cups. Two cups equal one standard drink. Track that number the way you’d track bottles of beer, and you’ll have a much more accurate picture of how much alcohol you’re actually consuming.