What is Apcheokcho?

Apcheokcho is a herb used in Korean folk medicine. It is the dried stem and leaf of the dayflower plant, Commelina communis. People drank it as a tea for fever, sore throat and puffy swelling.

Korean healers call it a "cooling" herb. They gave it for heat signs, such as a hot flushed face or a red painful throat. They also gave it to help the body pass more urine.

The proof in people is thin. Almost all of what we know comes from lab dishes and animal tests. Long use in a tradition is not proof that a herb works.

How does Apcheokcho work?

No one has shown how Apcheokcho acts in the human body.

Lab work points to two ideas. Plant compounds in it calmed swelling and redness in cell tests. Others slowed an enzyme (a body chemical) that breaks starch down into sugar, which may lower blood sugar in animals.

Old Korean texts explain it a different way. They say the herb "clears heat" and "drains damp". Those are ideas from an old system of thought, not a test of what happens in your cells.

What forms does Apcheokcho come in?

You will most often meet it in these forms: - Dried cut herb, boiled into a tea (a decoction) - Part of a mixed Korean herbal formula from a practitioner - Fresh young shoots eaten as a wild green vegetable - Powder or capsules, sold online - Fresh crushed leaf, laid on the skin in folk use

Decoction is the classic form. Capsules and powders are newer and are not well studied.

Where it comes from:

Apcheokcho has a long record across East Asia. In China it is called ya zhi cao and appears in classical herb books. Korea and Japan use the same plant in much the same way.

In Korea it sits among the everyday "heat-clearing" herbs. Village healers picked it fresh in summer for fevers and sore throats.

It has also served as food. Young shoots were eaten as namul, a seasoned wild green.

What does Apcheokcho help with?

• Fever and feeling overheated: This is the oldest and most common use. Korean and Chinese healers boiled the herb into a tea for a hot, flushed, feverish person. No human trial has tested it for fever, so we cannot say if it helps. A high fever needs a doctor, not a tea.
• Sore throat: Folk use is strong here. The tea was sipped, or used as a gargle, for a red and painful throat. Lab tests show some germ-slowing action in a dish, which is a long way from proof in a person. It is not a stand-in for antibiotics.
• Painful or burning urination: Old texts group it with herbs that "drain damp". People used it when passing urine stung or came in small amounts. There are no human trials. Burning urine can mean an infection, which can reach the kidneys, so see a doctor.
• Mild swelling and fluid build-up: The herb is described as a diuretic (something that makes you pass more urine). Animal work supports a mild effect. Swelling in the legs or belly can be a sign of heart, liver or kidney trouble, so get it checked first.
• Insect bites and minor skin sores: Fresh crushed leaf was laid on bites, boils and small sores. This is folk practice only. No trial has tested it on skin. Do not put plant matter on a deep or dirty wound.
• Blood sugar support (lab and animal work only): Extracts slowed starch digestion in lab tests and lowered blood sugar in some animal studies. That work has not moved into proper human trials. Do not use it to replace diabetes medicine.

Which foods are rich in Apcheokcho?

1. Dayflower namul: young shoots blanched and seasoned as a Korean wild green
2. Dayflower tea: dried herb boiled in water, the classic folk form

Practical Tips:

Food amounts are small and are treated as ordinary eating, not as medicine.

What are the side effects of Apcheokcho?

• Passing urine more often
• Upset stomach or nausea
• Loose stools or diarrhoea
• Feeling cold or chilly
• Low blood sugar signs: shaking, sweating, confusion
• Rash or itching (allergic reaction)

Good to know:

Most reports describe a mild herb, and the plant is eaten as a vegetable in some places. Even so, side effects have not been counted in any proper study, so the true rate is unknown.

Stomach upset and extra trips to the toilet are the ones people mention most. Stop at once if you get a rash, swelling of the lips or face, or trouble breathing.

How much Apcheokcho should you take?

• Recommended daily: No safe, tested dose has been set by modern research. The traditional tea uses about 9 to 30 grams of the dried herb per day, boiled in water. Fresh herb was used at higher amounts, up to about 60 grams. Capsule and powder makers set their own doses, and those doses are not backed by trials. Start at the low end if you use it at all. Ask a Korean medicine practitioner or your doctor first.
• Best time of day: Split the tea into two or three servings across the day. Take the last serving well before bed, since it can make you pass more urine at night.
• With or without food: Take it with or just after food. The tea can upset an empty stomach in some people.
• Time to effect: Not known. Folk use treats it as a same-day herb for fever or throat pain. If you feel no change in two or three days, stop.
• How long to take it: Short use only. Folk use is for a few days during an acute illness, not for months. Stop after about a week and take stock. If nothing has changed, stop and speak to a doctor. Long daily use has not been studied for safety.