Educational information, not medical advice — ask your doctor or midwife.
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Gu Jing Cao is the dried flower head and stalk of pipewort (Eriocaulon buergerianum), a small plant that grows in wet rice fields and marshes. It is a single drug (one herb on its own, not a mixed formula) used in Traditional Chinese Medicine. It is also known as Pipewort flower.
It is used mainly for red, sore, watery eyes that come on with a head cold, and for headache or toothache during the same kind of illness. In Chinese medicine it is described as a light, cooling herb that "clears wind-heat and brightens the eyes" — old wording for easing hot, irritated eyes.
Evidence verdict: Gu Jing Cao has a long, well-recorded place in Chinese herbal practice, but almost no human trial evidence. Traditional use tells you people have relied on something for a long time; it is not proof that it works, and that applies to everything below.
Nobody has shown how Gu Jing Cao works in the human body, and the honest answer is that we do not know.
Laboratory tests on extracts of the plant report anti-inflammatory (swelling-calming) and antibacterial activity in test tubes and in some animal studies. These findings involve concentrated extracts applied directly to cells, which is very different from drinking a herbal tea.
In the traditional model, the herb is thought to act on the Liver and Stomach channels and to carry cooling action upward to the head and eyes. That is a traditional framework for choosing herbs, not a description of measured biology.
The usual form is loose dried flower heads, sold whole or cut for tea. The traditional preparation is a decoction: the dried herb is simmered in water for about 20 to 30 minutes and the liquid is drunk warm.
You may also see it in ready-made granules, powders and mixed Chinese eye-care formulas. Single-herb capsules and tinctures exist but are much less common.
It is very often combined with other herbs rather than taken alone.
Gu Jing Cao appears in Chinese materia medica writing from around the Song dynasty (roughly the 10th to 13th century) and is listed in Li Shizhen's Ben Cao Gang Mu of 1596.
It has stayed in continuous use in Chinese eye-related formulas ever since, and it appears in the modern Chinese Pharmacopoeia. Its standing is inside one tradition rather than across several.
See a doctor the same day if your eye is very painful, if your vision blurs or dims, if you see flashes or floaters, if there is thick discharge or pus, or if bright light becomes hard to bear.
Also see a doctor if a red eye or headache lasts more than three to five days, gets worse, or comes with a high fever, a stiff neck or a rash.
Stop the herb and get urgent help if your face or lips swell, you break out in hives, or you struggle to breathe.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Gu Jing Cao is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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