Educational information, not medical advice — ask your doctor or midwife.
Spear grass root is the underground stem (rhizome) of Imperata cylindrica, a tough, sharp-leaved grass. In Yoruba it is called Ekan. West African healers dug up the roots, washed them, and boiled them in water.
The drink made this way was given for fever, for trouble passing urine, and for bleeding. The same grass root is used in Chinese medicine, where it is called bai mao gen.
Long traditional use is not proof that a remedy works, and it is not proof that it is safe. Human studies on spear grass root are very thin. Most of what is known comes from lab dishes and animals.
No one has shown how spear grass root acts in the human body. The ideas below come from test tubes and animal work only.
In rodent studies, root extracts raised urine output. That fits its old use as a water pill (diuretic). The root also carries potassium salts, which may add to this effect.
In test tubes and in animals, some root compounds have lowered markers of swelling and inflammation. Others shortened bleeding time in animal models. Whether either of these happens in a person is not established.
Lab tests also show mild activity against some bacteria and some free radicals. These are dish results. They do not tell you that the drink fights an infection in your body.
The sweet taste of the boiled root comes from simple sugars. That is taste, not a medicine effect.
Dried, chopped root for boiling is the usual form you will find.
Common forms include the following.
Dried cut root, simmered in water to make a drink. This is the classic West African and Chinese form.
Fresh root, washed and then crushed or juiced.
Powdered root, sold loose or packed into capsules.
Liquid extracts and tinctures, usually made with alcohol.
Mixed herbal teas, where the root sits alongside other herbs.
Labels are often vague. A pack may say only "cogon grass" or "bai mao gen" with no Latin name. Look for Imperata cylindrica printed on the pack.
Roots gathered from roadsides, drains or sprayed farmland can carry weed killer and heavy metals. Source matters as much as form.
Spear grass grows across West Africa as a stubborn, fast-spreading weed. Yoruba herbalists knew it as Ekan and dug the roots for medicine.
Healers boiled the roots and gave the water for fever, nosebleed and painful urine. The same water was used to wash wounds and sores.
In Chinese medicine the root, bai mao gen, was given to "cool the blood" and stop bleeding. It also appeared in mixed teas for thirst and dark urine.
Outside medicine, the grass was cut for thatch, used as rough fodder, and left to hold soil on bare slopes.
Stop and see a doctor if you feel dizzy, very thirsty, weak, or your heartbeat feels odd.
Get care the same day for burning urine with fever or back pain, for blood in your urine or stool, or for a nosebleed that will not stop.
Get emergency help for swelling of the face, lips or throat, for trouble breathing, or for fainting.
In the United States, the United Kingdom and the European Union, spear grass root is not a licensed medicine. It is sold as a food or herbal supplement, so no agency checks that a pack works. In Nigeria, herbal products are registered with NAFDAC, but registration is not proof of effect.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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