Cong Bai
Quick Facts
- What it is: Cong Bai is the white bulb of the spring onion, brewed hot in Chinese medicine at the first sign of a cold or chill.
- Main uses: Early cold with chills and a blocked nose, Feeling cold and shivery, Warming food when appetite is poor
- Best for: The first day or two of a chilly cold, A warming home drink alongside rest and fluids
- Active ingredients: Sulphur compounds (allyl sulphides), Allicin-type compounds, Quercetin and other flavonoids, Vitamin C
- Forms: Fresh scallion whites, Hot water brew with ginger, Soup and rice porridge, Mashed poultice on the skin
- Time to effect: Warmth and a clearer nose within about an hour, if at all; the effect is short-lived.
- Side effects: Mild and uncommon: onion breath, heartburn, gas, skin irritation from raw juice; allergy is rare.
Track this remedy in the app
Track Cong Bai with reminders and record whether it helped, in the app.
What is Cong Bai?
Cong Bai is the white bulb at the base of the spring onion (scallion), used as a herb in Chinese medicine. It is best known as a home remedy for the first day or two of a common cold, when you feel chilly and stuffed up. It is a food first and a herb second.
In Chinese practice it is brewed in hot water, often with fresh ginger or fermented soybean, and drunk hot to bring on a light sweat. It is also mashed and laid on the skin as a folk poultice, and eaten in soup and rice porridge.
The honest verdict: Cong Bai has a long and respected place in Chinese home and clinical practice, but long use is not proof that it works. We could not find human trials testing Cong Bai on its own. Treat it as a warming, comforting food, not as a treatment for illness.
How does Cong Bai work?
The short answer is that no one has shown clearly how it works in people. In Chinese medicine, Cong Bai is described as warm and pungent. It is said to "release the exterior" — to push a chill out of the body through the skin by making you sweat lightly.
A plainer way to put it: a hot, spicy drink makes you sweat, opens your nose for a while and feels good when you are cold. That effect is real, but it is largely the heat and the pungent smell, not something unique to this plant.
Lab work on the onion family shows that the sulphur compounds in them can slow the growth of some bacteria in a dish and can act as antioxidants (they mop up unstable molecules). Those findings come from test tubes and animals. They have not been shown to change the course of a cold in a person.
What forms does Cong Bai come in?
Fresh whole scallion whites are the standard form. Most traditional recipes call for two or three of them, cut up and simmered briefly.
You may also meet it as:
A hot water brew, often with ginger, brown sugar or fermented soybean.
A mashed poultice laid on the skin in folk practice.
An ingredient in soups, rice porridge and everyday cooking.
Dried scallion white in packaged herb mixes, though fresh is preferred.
It is not commonly sold as a capsule or a standardised extract.
Where it comes from:
Cong Bai appears in early Chinese medical writing, including formulas in the Shang Han Lun (Treatise on Cold Damage, around 200 CE). The classic pairing with fermented soybean, Cong Chi Tang, is still taught today.
It sits in the group of warm, pungent herbs used at the very start of a chill. In Chinese homes it has been a first-day cold drink for centuries, more kitchen than pharmacy.
Who should avoid Cong Bai?
- Do not use if you are allergic to onions, garlic, leeks or chives.
- Do not use if you take warfarin or another blood thinner (a drug that stops clots), unless your doctor has said it is fine.
- Do not use if you take aspirin or clopidogrel (drugs that keep platelets from sticking) in medicine-sized herb doses, without medical advice.
- Do not use if you have a bleeding disorder such as haemophilia (a condition where the blood does not clot properly).
- Do not use if you have surgery or dental surgery booked in the next two weeks.
- Do not use if you are already sweating heavily, or feel weak, faint or dried out, since the hot brew makes you sweat more.
- Do not use if you are pregnant or breastfeeding and want more than normal food amounts; the herb dose has not been studied in pregnancy.
- Do not use if you have acid reflux (stomach acid rising into your throat) that onions set off.
- Do not use if you are giving it as a medicine to a baby under one year old.
- Do not use if you have a high fever, a stiff neck, chest pain or trouble breathing — you need a doctor, not a home remedy.
When should you see a doctor?
See a doctor if a fever stays above 38.5C for more than three days, or if a cold is still getting worse after a week. Get care sooner for chest pain, shortness of breath, coughing up blood, a stiff neck, or confusion.
Also see a doctor if you notice easy bruising, nosebleeds or bleeding gums while taking this herb with a blood thinner. Have a boil or skin swelling checked if it grows, feels hot, or you get a fever with it.
Call emergency services if your lips, tongue or throat swell, or you cannot breathe properly. That is a severe allergic reaction.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
4.8
