Educational information, not medical advice — ask your doctor or midwife.
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Jue Ming Zi is the dried seed of the cassia plant (Cassia obtusifolia or Cassia tora). It is a single drug (TCM herb), not a formula, and is also known as cassia seed. In Chinese medicine it is used for red, sore or tired eyes, for headache with dizziness, and for dry, hard stools.
Most people meet it as a nutty-tasting roasted seed tea. It is also sold as a powder, in capsules, and as one ingredient inside larger Chinese herbal formulas.
Evidence verdict: it is a long-standing staple of Chinese herbal medicine, but good human trial evidence is thin and does not confirm the modern claims made for it. Traditional use tells you what people have done for a long time; it is not proof that something works.
The clearest effect is on the bowel. The seed contains anthraquinones, plant chemicals that irritate the lining of the large intestine and make it push stool along faster. This is the same broad family of chemicals found in senna.
The seed also holds mucilage (a slippery, water-holding fibre), which may soften stool and add bulk.
The eye, cholesterol and blood pressure claims are less settled. Laboratory and animal work suggests the anthraquinones may lower blood fats and relax blood vessels, but that work has not been matched by solid human trials, so treat the mechanism as a theory rather than a finding.
Roasted whole seed is the most common form. The seeds are lightly toasted and steeped in hot water as a tea, either alone or with chrysanthemum flower.
Raw (unroasted) seed is used in Chinese clinics when a stronger bowel effect is wanted. It is decocted, meaning simmered in water for a set time.
Ground powder and capsules are sold as supplements. Doses in these products vary a lot between brands, and the label rarely says whether the seed is raw or roasted.
The seed also appears inside prepared Chinese formulas. If you take one of those, check the ingredient list so you do not double up.
Jue Ming Zi appears in the Shen Nong Ben Cao Jing, a Chinese materia medica compiled around the first to second century CE. The name means roughly "seed that brightens the eyes".
It has stayed in continuous use in Chinese medicine since then, classed as a herb that clears heat from the liver channel and moistens the bowel. It is also a common household tea in China, Korea and Japan.
See a doctor if constipation lasts more than a week, keeps returning, or comes with belly pain, vomiting or blood in the stool.
Get medical help the same day for severe cramping, diarrhoea that will not stop, or signs of dehydration such as very dark urine, dizziness on standing or barely passing water.
Get urgent help for muscle weakness, a fluttering or irregular heartbeat, or fainting — these can be signs of low potassium. Also see a doctor rather than reaching for the tea if your eye is painful or red, or your sight changes.
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 Jue Ming Zi 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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