Educational information, not medical advice — ask your doctor or midwife.
Track Bak (hobak-bak) with reminders and record whether it helped, in the app.
Bak is the bottle gourd (Latin name Lagenaria siceraria). It is a pale green climbing gourd. In Korea it is both a food and a simple home remedy.
Korean folk practice uses the flesh, the dried rind and sometimes the seeds. These are simmered into a thin soup or tea. People take it for puffiness, fluid retention and summer heat.
Here is the honest verdict on the evidence. No good human trials show that bak treats any condition.
Its standing rests on long folk and food use across East and South Asia. But traditional use is not proof that something works.
One warning matters more than anything else on this page. A bottle gourd that tastes bitter is poisonous.
Bitter fruit is high in cucurbitacins (natural poisons made by the gourd family). Drinking bitter bottle gourd juice has caused severe vomiting, bleeding in the gut and deaths.
No one has shown clearly how bak works in people. The ideas below are ideas, not proven mechanisms.
The fruit is about 95 percent water. It also holds potassium and fibre. A watery, low-salt food can make you pass more urine.
That may explain its old name as a cooling food that moves water.
Lab and animal studies report mild effects from gourd extracts. These touched blood sugar, blood fats and inflammation (swelling inside the body).
Those were test-tube and rodent results. The doses do not match a bowl of soup. So do not read them as effects in people.
In Korean and Chinese tradition, bak is called cool and sweet. It is used to "drain damp" and cool summer heat. That names a pattern, not a body mechanism.
You will meet bak as food far more often than as a supplement.
Common forms:
Fresh fruit, peeled and simmered in soups, stews or porridge.
Dried rind or flesh, sold in strips and boiled into a thin decoction (a tea made by simmering).
Dried gourd shell. In Korea this is used mainly as a bowl or ladle, not as a medicine.
Seeds, roasted or simmered in some folk uses.
Bottled or juiced raw gourd, sold in some markets as a health drink. This form is the one linked to poisoning cases. Be most careful with it.
Bottle gourd is one of the oldest crop plants in the world. It reached East Asia thousands of years ago.
In Korea it shows up in food, in folk tales and in household goods. The dried shell makes a natural bowl.
As a remedy it sits in the Korean folk layer. It is not at the heart of the classic formula books.
Chinese medicine lists it as hu lu, and Ayurveda as lauki. Both use it for swelling and urine complaints. That is why its folk standing is broad across several traditions.
Its food use is far better recorded than its use as a medicine.
Some reactions to Bak (hobak-bak) need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Get emergency help straight away if you have swallowed bitter gourd or bitter gourd juice and then start vomiting repeatedly, vomit blood, pass black or bloody stools, get severe stomach pain, feel faint or stop passing urine. This can become life-threatening quickly.
See a doctor soon, rather than continuing with bak, if your swelling is getting worse, if one leg is swollen and painful, if you are short of breath, or if you have gained weight quickly without eating more.
Also check with your doctor or pharmacist before starting bak as a remedy if you take medicine for your heart, blood pressure, diabetes or mood.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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