Damjugyeop
Quick Facts
- What it is: Damjugyeop is the dried leaf of the grass Lophatherum gracile, used in Korean herbal practice as a cooling tea.
- Main uses: Fever with thirst, Mouth and tongue sores, Dark urine, Summer heat
- Best for: Short-term use as a cooling tea in hot weather
- Active ingredients: Isoorientin, Orientin, Vitexin, Isovitexin, Arundoin, Cylindrin, Friedelin
- Forms: Dried cut leaf for tea, Powder, Granules, Tea bags, Part of mixed herbal formulas
- Time to effect: Not known from trials; tradition expects a same-day change in thirst or urine.
- Side effects: Mostly mild: more urination, dry mouth, and loose stools; fluid and salt loss is the main risk.
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What is Damjugyeop?
Damjugyeop is the dried leaf of a grass. Its Latin name is Lophatherum gracile. Shops may sell it under the name Lophatherum.
It is a single drug, which means one plant used on its own. Korean healers call it a cooling herb. They use it for fever with thirst, a dry mouth, sores in the mouth, and dark urine.
Here is the honest verdict. The leaf has a long record of use in Korea and China, but human trials are missing. Long use is not proof that a herb works, so treat the old claims with care.
How does Damjugyeop work?
No one has shown how this leaf works in the body.
In Korean practice it is said to clear "heat" and wash it out in the urine. That is an idea from old theory. It is not something a lab test has proven.
Lab and animal tests give a few hints. The leaf holds plant chemicals that mop up free radicals (unstable bits that can harm cells). Some animal work suggests it may calm swelling or raise urine flow.
None of this has been tested in people. So treat these as hints, not facts.
What forms does Damjugyeop come in?
The main form is the dried, cut leaf. You simmer it in water to make a tea. This is the form used in Korean herbal practice.
It also comes as a loose powder or as granules you stir into hot water. Plain tea bags are sold as well.
Most often it is one part of a mixed formula with other herbs. Product strength is not standard, so the amount of plant per dose differs a lot by brand.
Where it comes from:
The leaf has been used in East Asia for hundreds of years. It appears in Chinese herb books from the 1500s, and in Korean practice from around the same time.
Korean texts place it with the cooling herbs. It was given in hot weather, for fever with thirst, and for sores in the mouth.
It was rarely taken alone. Healers mixed it into larger formulas.
Who should avoid Damjugyeop?
- Do not use if you are pregnant. Korean and Chinese texts treat this as an outright ban.
- Do not use if you are breastfeeding, as nothing is known about safety for the baby.
- Do not use if you take lithium, a medicine for mood, because the herb can push lithium to harmful levels.
- Do not use if you take water pills (diuretics), digoxin or other heart-rhythm medicines, unless your doctor has agreed.
- Do not use if you have kidney disease or are on dialysis (a machine that cleans the blood).
- Do not use if you are dehydrated, or if you have been vomiting or have diarrhoea.
- Do not use if you are allergic to grasses or grass pollen.
- Never give it to a baby or young child unless a doctor tells you to.
When should you see a doctor?
See a doctor if a fever lasts more than three days, or goes above 39C (102F). Get help the same day if you have burning when you pass urine along with back pain, chills or blood in the urine, as this can mean a kidney infection. Book an appointment if mouth sores have not healed in two weeks. Stop the herb and call a doctor if you feel dizzy, very weak, or your heart pounds or flutters.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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